diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/README.md b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/README.md
new file mode 100644
index 000000000000..c2de5f7a15f6
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/README.md
@@ -0,0 +1,168 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# rffti
+
+> Initialize a workspace array for performing a real-valued Fourier transform.
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Package usage documentation. -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var rffti = require( '@stdlib/fft/base/fftpack/rffti' );
+```
+
+#### rffti( N, workspace, strideW, offsetW )
+
+Initializes a workspace array for performing a real-valued Fourier transform.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var N = 8;
+var workspace = new Float64Array( ( 2*N ) + 34 );
+
+var out = rffti( N, workspace, 1, 0 );
+// returns <Float64Array>
+
+var bool = ( out === workspace );
+// returns true
+
+var twiddleFactors = workspace.slice( N, 2*N );
+// returns <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
+
+var factors = workspace.slice( 2*N, ( 2*N ) + 4 );
+// returns <Float64Array>[ 8, 2, 2, 4 ]
+```
+
+The function accepts the following arguments:
+
+-   **N**: length of the sequence to transform.
+-   **workspace**: workspace array.
+-   **strideW**: stride length for `workspace`.
+-   **offsetW**: starting index for `workspace`.
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+## Notes
+
+-   The workspace array is divided into three sections:
+
+    ```text
+              size = N                 N            2+ceil(log2(N)/2)
+                   ↓                   ↓                  ↓
+        | scratch / workspace | twiddle factors | radix factor table |
+                   ↑                   ↑                  ↑
+    i = 0         ...         N       ...       2N       ...
+    ```
+
+    -   **scratch/workspace**: used as a scratch space when performing transforms. This section is not updated during initialization.
+    -   **twiddle factors**: a table of reusable complex-exponential constants stored as cosine/sine pairs.
+    -   **radix factor table**: a table containing the sequence length `N`, the number of factors into which `N` was decomposed, and the individual integer radix factors.
+
+-   In general, a workspace array should have `2N + 34` indexed elements (as `log2(N)/2 ≤ 32` for all `2^64`). During initialization, only the sections for storing twiddle factors and the factorization of `N` are updated.
+
+-   The radix factor table is comprised as follows:
+
+    ```text
+    | sequence_length | number_of_factors | integer_factors |
+    ```
+
+-   If `N` equals `1`, the function returns early without modifying the workspace, as a single data point is its own Fourier transform.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+var rffti = require( '@stdlib/fft/base/fftpack/rffti' );
+
+var N = 8;
+var workspace = new Float64Array( ( 2*N ) + 34 );
+
+rffti( N, workspace, 1, 0 );
+
+console.log( 'Sequence length: %d', N );
+console.log( 'Twiddle factors:' );
+var i;
+for ( i = N; i < 2*N; i++ ) {
+    console.log( '  workspace[%d] = %d', i, workspace[ i ] );
+}
+
+console.log( 'Factorization:' );
+var nf = workspace[ ( 2*N ) + 1 ];
+
+console.log( '  number of factors: %d', nf );
+for ( i = 0; i < nf; i++ ) {
+    console.log( '  factor[%d]: %d', i, workspace[ ( 2*N ) + 2 + i ] );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="references">
+
+</section>
+
+<!-- /.references -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+</section>
+
+<!-- /.links -->
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/benchmark/benchmark.js b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/benchmark/benchmark.js
new file mode 100644
index 000000000000..07feddfa216b
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/benchmark/benchmark.js
@@ -0,0 +1,101 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var format = require( '@stdlib/string/format' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var Float64Array = require( '@stdlib/array/float64' );
+var pkg = require( './../package.json' ).name;
+var rffti = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} N - sequence length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( N ) {
+	var workspace = new Float64Array( ( 2*N ) + 34 );
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			rffti( N, workspace, 1, 0 );
+			if ( isnan( workspace[ N+1 ] ) ) {
+				b.fail( 'should not return NaN' );
+			}
+		}
+		b.toc();
+		if ( isnan( workspace[ N+1 ] ) ) {
+			b.fail( 'should not return NaN' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var lengths;
+	var N;
+	var f;
+	var i;
+
+	lengths = [
+		8,
+		16,
+		32,
+		64,
+		128,
+		256,
+		512,
+		1024
+	];
+
+	for ( i = 0; i < lengths.length; i++ ) {
+		N = lengths[ i ];
+		f = createBenchmark( N );
+		bench( format( '%s:N=%d', pkg, N ), f );
+	}
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/repl.txt b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/repl.txt
new file mode 100644
index 000000000000..92ba0e409b67
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/repl.txt
@@ -0,0 +1,56 @@
+
+{{alias}}( N, workspace, strideW, offsetW )
+    Initializes a workspace array for performing a real-valued Fourier
+    transform.
+
+    The workspace array is divided into three sections:
+
+    1. scratch/workspace: the section ranges from indices 0 to N-1 and is used
+        while performing transforms. This section is not updated during
+        initialization.
+
+    2. twiddle factors: the section ranges from indices N to 2N-1 and stores a
+        table of reusable complex exponential constants as cosine/sine pairs.
+
+    3. radix factor table: the section starts at index 2N and stores the
+        sequence length N, the number of factors into which N was decomposed,
+        and the individual integer radix factors.
+
+    Any remaining array space remains as unused storage.
+
+    Parameters
+    ----------
+    N: integer
+        Length of the sequence.
+
+    workspace: ArrayLikeObject<number>
+        Workspace array.
+
+    strideW: integer
+        Stride length for `workspace`.
+
+    offsetW: integer
+        Starting index for `workspace`.
+
+    Returns
+    -------
+    out: ArrayLikeObject<number>
+        Workspace array.
+
+    Examples
+    --------
+    > var {{alias:@stdlib/array/float64}} = require( '@stdlib/array/float64' );
+    > var N = 8;
+    > var workspace = new {{alias:@stdlib/array/float64}}( ( 2*N ) + 34 );
+    > var out = {{alias}}( N, workspace, 1, 0 )
+    <Float64Array>
+    > var bool = ( out === workspace )
+    true
+    > var twiddleFactors = workspace.slice( N, 2*N )
+    <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
+    > var factors = workspace.slice( 2*N, ( 2*N ) + 4 )
+    <Float64Array>[ 8, 2, 2, 4 ]
+
+    See Also
+    --------
+
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/types/index.d.ts b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/types/index.d.ts
new file mode 100644
index 000000000000..648888833e33
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/types/index.d.ts
@@ -0,0 +1,57 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { Collection } from '@stdlib/types/array';
+
+/**
+* Initializes a workspace array for performing a real-valued Fourier transform.
+*
+* @param N - length of the sequence
+* @param workspace - workspace array
+* @param strideW - stride length for `workspace`
+* @param offsetW - starting index for `workspace`
+* @returns workspace array
+*
+* @example
+* var Float64Array = require( '@stdlib/array/float64' );
+*
+* var N = 8;
+* var workspace = new Float64Array( ( 2*N ) + 34 );
+*
+* var out = rffti( N, workspace, 1, 0 );
+* // returns <Float64Array>
+*
+* var bool = ( out === workspace );
+* // returns true
+*
+* var twiddleFactors = workspace.slice( N, 2*N );
+* // returns <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
+*
+* var factors = workspace.slice( 2*N, ( 2*N ) + 4 );
+* // returns <Float64Array>[ 8, 2, 2, 4 ]
+*/
+declare function rffti<T extends Collection<number>>( N: number, workspace: T, strideW: number, offsetW: number ): T;
+
+
+// EXPORTS //
+
+export = rffti;
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/types/test.ts b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/types/test.ts
new file mode 100644
index 000000000000..6d1f815d9301
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/docs/types/test.ts
@@ -0,0 +1,94 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import rffti = require( './index' );
+
+
+// TESTS //
+
+// The function returns a collection...
+{
+	const workspace = new Float64Array( ( 2*8 ) + 34 );
+
+	rffti( 8, workspace, 1, 0 ); // $ExpectType Float64Array
+}
+
+// The compiler throws an error if the function is provided a first argument which is not a number...
+{
+	const workspace = new Float64Array( ( 2*8 ) + 34 );
+
+	rffti( '8', workspace, 1, 0 ); // $ExpectError
+	rffti( true, workspace, 1, 0 ); // $ExpectError
+	rffti( false, workspace, 1, 0 ); // $ExpectError
+	rffti( null, workspace, 1, 0 ); // $ExpectError
+	rffti( void 0, workspace, 1, 0 ); // $ExpectError
+	rffti( [], workspace, 1, 0 ); // $ExpectError
+	rffti( {}, workspace, 1, 0 ); // $ExpectError
+	rffti( ( x: number ): number => x, workspace, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a second argument which is not an array of numbers...
+{
+	rffti( 8, '50', 1, 0 ); // $ExpectError
+	rffti( 8, 50, 1, 0 ); // $ExpectError
+	rffti( 8, true, 1, 0 ); // $ExpectError
+	rffti( 8, false, 1, 0 ); // $ExpectError
+	rffti( 8, null, 1, 0 ); // $ExpectError
+	rffti( 8, void 0, 1, 0 ); // $ExpectError
+	rffti( 8, {}, 1, 0 ); // $ExpectError
+	rffti( 8, ( x: number ): number => x, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a third argument which is not a number...
+{
+	const workspace = new Float64Array( ( 2*8 ) + 34 );
+
+	rffti( 8, workspace, '1', 0 ); // $ExpectError
+	rffti( 8, workspace, true, 0 ); // $ExpectError
+	rffti( 8, workspace, false, 0 ); // $ExpectError
+	rffti( 8, workspace, null, 0 ); // $ExpectError
+	rffti( 8, workspace, void 0, 0 ); // $ExpectError
+	rffti( 8, workspace, [], 0 ); // $ExpectError
+	rffti( 8, workspace, {}, 0 ); // $ExpectError
+	rffti( 8, workspace, ( x: number ): number => x, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a fourth argument which is not a number...
+{
+	const workspace = new Float64Array( ( 2*8 ) + 34 );
+
+	rffti( 8, workspace, 1, '0' ); // $ExpectError
+	rffti( 8, workspace, 1, true ); // $ExpectError
+	rffti( 8, workspace, 1, false ); // $ExpectError
+	rffti( 8, workspace, 1, null ); // $ExpectError
+	rffti( 8, workspace, 1, void 0 ); // $ExpectError
+	rffti( 8, workspace, 1, [] ); // $ExpectError
+	rffti( 8, workspace, 1, {} ); // $ExpectError
+	rffti( 8, workspace, 1, ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	const workspace = new Float64Array( ( 2*8 ) + 34 );
+
+	rffti(); // $ExpectError
+	rffti( 8 ); // $ExpectError
+	rffti( 8, workspace ); // $ExpectError
+	rffti( 8, workspace, 1 ); // $ExpectError
+	rffti( 8, workspace, 1, 0, 123 ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/examples/index.js b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/examples/index.js
new file mode 100644
index 000000000000..92a7803afedf
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/examples/index.js
@@ -0,0 +1,42 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var Float64Array = require( '@stdlib/array/float64' );
+var rffti = require( './../lib' );
+
+var N = 8;
+var workspace = new Float64Array( ( 2*N ) + 34 );
+
+rffti( N, workspace, 1, 0 );
+
+console.log( 'Sequence length: %d', N );
+console.log( 'Twiddle factors:' );
+var i;
+for ( i = N; i < 2*N; i++ ) {
+	console.log( '  workspace[%d] = %d', i, workspace[ i ] );
+}
+
+console.log( 'Factorization:' );
+var nf = workspace[ ( 2*N ) + 1 ];
+
+console.log( '  number of factors: %d', nf );
+for ( i = 0; i < nf; i++ ) {
+	console.log( '  factor[%d]: %d', i, workspace[ ( 2*N ) + 2 + i ] );
+}
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/index.js b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/index.js
new file mode 100644
index 000000000000..51c16c7bcb35
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/index.js
@@ -0,0 +1,53 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Initialize a workspace array for performing a real-valued Fourier transform.
+*
+* @module @stdlib/fft/base/fftpack/rffti
+*
+* @example
+* var Float64Array = require( '@stdlib/array/float64' );
+* var rffti = require( '@stdlib/fft/base/fftpack/rffti' );
+*
+* var N = 8;
+* var workspace = new Float64Array( ( 2*N ) + 34 );
+*
+* var out = rffti( N, workspace, 1, 0 );
+* // returns <Float64Array>
+*
+* var bool = ( out === workspace );
+* // returns true
+*
+* var twiddleFactors = workspace.slice( N, 2*N );
+* // returns <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
+*
+* var factors = workspace.slice( 2*N, ( 2*N ) + 4 );
+* // returns <Float64Array>[ 8, 2, 2, 4 ]
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/main.js b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/main.js
new file mode 100644
index 000000000000..08aafc0ffdb1
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/main.js
@@ -0,0 +1,176 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*
+*
+* ## Notice
+*
+* The original C code and copyright notice are from the [PFFFT library]{@link https://github.com/marton78/pffft/blob/0b4ee12c4ba45a4a8e567550c16d96d1679f50ce/src/fftpack.c}. The implementation follows the original, but has been modified for JavaScript.
+*
+* ```text
+* Copyright (c) 2004 the University Corporation for Atmospheric
+* Research ("UCAR"). All rights reserved. Developed by NCAR's
+* Computational and Information Systems Laboratory, UCAR,
+* www.cisl.ucar.edu.
+*
+* Redistribution and use of the Software in source and binary forms,
+* with or without modification, is permitted provided that the
+* following conditions are met:
+*
+*     - Neither the names of NCAR's Computational and Information Systems
+*       Laboratory, the University Corporation for Atmospheric Research,
+*       nor the names of its sponsors or contributors may be used to
+*       endorse or promote products derived from this Software without
+*       specific prior written permission.
+*
+*     - Redistributions of source code must retain the above copyright
+*       notices, this list of conditions, and the disclaimer below.
+*
+*     - Redistributions in binary form must reproduce the above copyright
+*       notice, this list of conditions, and the disclaimer below in the
+*       documentation and/or other materials provided with the
+*       distribution.
+*
+* THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
+* HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
+* EXEMPLARY, OR CONSEQUENTIAL DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
+* SOFTWARE.
+* ```
+*/
+
+'use strict';
+
+// MODULES //
+
+var rffti1 = require( './rffti1.js' );
+
+
+// MAIN //
+
+/**
+* Initializes a workspace array for performing a real-valued Fourier transform.
+*
+* ## Notes
+*
+* The workspace array is divided into three sections:
+*
+* ```text
+*           size = N                 N            2+ceil(log2(N)/2)
+*                ↓                   ↓                  ↓
+*     | scratch / workspace | twiddle factors | radix factor table |
+*                ↑                   ↑                  ↑
+* i = 0         ...         N       ...       2N       ...
+* ```
+*
+* where
+*
+* -   **scratch/workspace**: used as a scratch space when performing transforms. This section is not updated during initialization.
+* -   **twiddle factors**: a table of reusable complex-exponential constants stored as cosine/sine pairs.
+* -   **radix factor table**: a table containing the radix factorization of `N`.
+*
+* In general, a workspace array should have `2N + 34` indexed elements (as `log2(N)/2 ≤ 32` for all `2^64`). During initialization, only the sections for storing twiddle factors and the factorization of `N` are updated.
+*
+* > Note: FFTPACK only requires `2N+15`, but we increase that number here to accommodate larger workspace arrays, where `N` may exceed `2^30` indexed elements.
+*
+* The first two sections each contain `N` elements, while the last section contains the sequence length, the number of integer factors, and, at most, `ceil(log2(N)/2)` integer radix factors.
+*
+* The factorization section is comprised as follows:
+*
+* ```text
+* | sequence_length | number_of_factors | integer_factors |
+* ```
+*
+* The sequence length and number of factors (`nf`) comprise a single element each. Only the first `nf` elements in the integer factors section are written to, with the rest being unused.
+*
+* As for twiddle factors, these are small, reusable complex-exponential constants that appear inside each "butterfly" stage of a Cooley–Tukey–style FFT. Every arithmetic step in an FFT multiplies one intermediate value by some
+*
+* ```tex
+* W_N^k
+* ```
+*
+* where `W_N^k` is an N-th root of unity. Formally, in a forward FFT,
+*
+* ```tex
+* W_N^k = e^{-2\pi ik/N}
+* ```
+*
+* In a backward FFT,
+*
+* ```tex
+* W_N^k = e^{+2\pi ik/N}
+* ```
+*
+* As may be observed, `W_N^k` for forward and backward FFTs is the same, except the sign of the exponent is flipped. As a consequence, both real and backward FFT callers can reuse the same set of twiddle factors, with those performing a forward transform (e.g., `rfftf`) multiplying with `(cos,-sin)` and those performing a backward transform (e.g., `rfftb`) multiplying with `(cos,+sin)`.
+*
+* Because these constants only depend on the transform length `N` (and **not** on the input data), we can pre-compute and store them once, then "twiddle" them (i.e., reuse them with different indices) as we proceed through the factorization.
+*
+* > As a quick aside regarding the name "twiddle", early FFT papers (notably Gentleman & Sande, 1966) described how you "twiddle" one branch of each butterfly by a complex rotation before adding/subtracting. The coefficients themselves inherited the nickname "twiddle factors," and the term stuck.
+*
+* By reusing the workspace array when computing multiple transforms of the same length `N`, every subsequent `*f` (forward) or `*b` (backward) call can simply look up the pre-stored twiddle factors instead of recomputing sine and cosine on-the-fly.
+*
+* In short, twiddle factors are cached roots of unity that allow each stage of the algorithm to rotate data quickly and predictably.
+*
+* @param {NonNegativeInteger} N - length of the sequence to transform
+* @param {Collection} workspace - workspace array
+* @param {integer} strideW - stride length for `workspace`
+* @param {NonNegativeInteger} offsetW - starting index for `workspace`
+* @returns {Collection} workspace array
+*
+* @example
+* var Float64Array = require( '@stdlib/array/float64' );
+*
+* var N = 8;
+* var workspace = new Float64Array( ( 2*N ) + 34 );
+*
+* var out = rffti( N, workspace, 1, 0 );
+* // returns <Float64Array>
+*
+* var bool = ( out === workspace );
+* // returns true
+*
+* var twiddleFactors = workspace.slice( N, 2*N );
+* // returns <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
+*
+* var factors = workspace.slice( 2*N, ( 2*N ) + 4 );
+* // returns <Float64Array>[ 8, 2, 2, 4 ]
+*/
+function rffti( N, workspace, strideW, offsetW ) {
+	var offsetT;
+	var offsetF;
+
+	// When a sub-sequence is a single data point, the FFT is the identity, so no initialization necessary...
+	if ( N === 1 ) {
+		return;
+	}
+	// Resolve the starting indices for storing twiddle factors and factorization results:
+	offsetT = offsetW + ( N*strideW ); // index offset for twiddle factors
+	offsetF = offsetT + ( N*strideW ); // index offset for factorization results
+
+	// Initialize a provided workspace array:
+	rffti1( N, workspace, strideW, offsetT, workspace, strideW, offsetF );
+
+	return workspace;
+}
+
+
+// EXPORTS //
+
+module.exports = rffti;
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/rffti1.js b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/rffti1.js
new file mode 100644
index 000000000000..60c1bfee8e0d
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/lib/rffti1.js
@@ -0,0 +1,183 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*
+*
+* ## Notice
+*
+* The original C code and copyright notice are from the [PFFFT library]{@link https://github.com/marton78/pffft/blob/0b4ee12c4ba45a4a8e567550c16d96d1679f50ce/src/fftpack.c}. The implementation follows the original, but has been modified for JavaScript.
+*
+* ```text
+* Copyright (c) 2004 the University Corporation for Atmospheric
+* Research ("UCAR"). All rights reserved. Developed by NCAR's
+* Computational and Information Systems Laboratory, UCAR,
+* www.cisl.ucar.edu.
+*
+* Redistribution and use of the Software in source and binary forms,
+* with or without modification, is permitted provided that the
+* following conditions are met:
+*
+*     - Neither the names of NCAR's Computational and Information Systems
+*       Laboratory, the University Corporation for Atmospheric Research,
+*       nor the names of its sponsors or contributors may be used to
+*       endorse or promote products derived from this Software without
+*       specific prior written permission.
+*
+*     - Redistributions of source code must retain the above copyright
+*       notices, this list of conditions, and the disclaimer below.
+*
+*     - Redistributions in binary form must reproduce the above copyright
+*       notice, this list of conditions, and the disclaimer below in the
+*       documentation and/or other materials provided with the
+*       distribution.
+*
+* THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
+* HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
+* EXEMPLARY, OR CONSEQUENTIAL DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
+* SOFTWARE.
+* ```
+*/
+
+'use strict';
+
+// MODULES //
+
+var sincos = require( '@stdlib/math/base/special/sincos' ).assign;
+var TWO_PI = require( '@stdlib/constants/float64/two-pi' );
+var floor = require( '@stdlib/math/base/special/floor' );
+var decompose = require( '@stdlib/fft/base/fftpack/decompose' );
+
+
+// VARIABLES //
+
+// Define a list of initial trial factors for FFT factorization:
+var TRIAL_FACTORS = [ 4, 2, 3, 5 ];
+
+
+// MAIN //
+
+/**
+* Initializes the working arrays for applying a Fourier transform to a real-valued sequence.
+*
+* @private
+* @param {NonNegativeInteger} N - length of the sequence
+* @param {Collection} twiddles - array of twiddle factors
+* @param {integer} strideT - stride length for `twiddles`
+* @param {NonNegativeInteger} offsetT - starting index for `twiddles`
+* @param {Collection} factors - array containing a radix factorization
+* @param {integer} strideF - stride length for `factors`
+* @param {NonNegativeInteger} offsetF - starting index for `factors`
+* @returns {void}
+*/
+function rffti1( N, twiddles, strideT, offsetT, factors, strideF, offsetF ) {
+	var factor;
+	var argld;
+	var argh;
+	var fidx;
+	var nf;
+	var fi;
+	var l2;
+	var l1;
+	var ld;
+	var st;
+	var it;
+	var im;
+	var M;
+	var m;
+	var k;
+	var j;
+
+	// Decompose the sequence length into its radix factors:
+	nf = decompose( N, 4, TRIAL_FACTORS, 1, 0, factors, strideF, offsetF );
+
+	// If the number of radix factors is `1`, the only twiddle factor we need is `W_N^0 = 1`, which the main transform kernels already hard-code, so nothing to pre-compute...
+	if ( nf-1 === 0 ) {
+		return;
+	}
+	// Compute the master angular step (i.e., the basic angle that generates all twiddles):
+	argh = TWO_PI / N;
+
+	// Define the location of the first sine term we want to compute:
+	im = 1;
+
+	// Initialize a running product of factors already processed:
+	l1 = 1;
+
+	// Compute the index of the first radix factor:
+	fidx = offsetF + ( 2*strideF );
+
+	// Compute the stride length for each cosine/sine pair:
+	st = 2 * strideT;
+
+	// Generate twiddle factors...
+	for ( k = 0; k < nf-1; k++ ) {
+		// Resolve the next radix factor:
+		factor = factors[ fidx ];
+
+		// Compute the length of the transform after including the current radix:
+		l2 = factor * l1;
+
+		// Compute the number of the "butterfly wings" (at this stage, the data is viewed as a `factor`-point transform of sub-vectors of length `l1`; `M` describes how many such vectors fit in the full array of length `N`):
+		M = floor( N / l2 );
+
+		// Initialize a running offset used to step the angle:
+		ld = 0;
+
+		// Iterate over each butterfly column within the current radix...
+		for ( j = 1; j < factor; j++ ) {
+			// Advance to the next column:
+			ld += l1;
+
+			// Compute the angle step for this column:
+			argld = ld * argh; // 2π ⋅ j ⋅ li / N, which is the j-th column's base angle
+
+			// Initialize a counter which counts from `1` to `(M/2)-1` (i.e., all non-trivial harmonics):
+			fi = 1.0;
+
+			// Compute the index of the sine term:
+			it = offsetT + ( (im+1)*strideT );
+
+			// Iterate over each non-trivial harmonic in the column (note: we skip the `m=0` and `m=1` (i.e., the first cosine/sine pair, the first harmonic `W_N^0 = cos(0) + j sin(0) = 1 + j⋅0` is trivial and hard-coded by transform kernels)...
+			for ( m = 2; m < M; m += 2 ) {
+				// Compute `(cos(fi*argld), sin(fi*argld))`:
+				sincos( fi*argld, twiddles, -strideT, it ); // note: `sincos` returns the sine and cosine, in that order, so we need to use a negative stride when assigning the values to `twiddles` to ensure that cosine comes before sine in the twiddles table
+
+				// Update for the next harmonic:
+				fi += 1.0;
+
+				// Resolve the index of the next sine term:
+				it += st;
+			}
+			// Advance `im` by the size of the current block, skipping the cosine/sine pairs we have just written:
+			im += M;
+		}
+		// Update the running product of factors already processed:
+		l1 = l2;
+
+		// Resolve the index of the next radix factor:
+		fidx += strideF;
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = rffti1;
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/package.json b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/package.json
new file mode 100644
index 000000000000..ea78bb766695
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/package.json
@@ -0,0 +1,64 @@
+{
+  "name": "@stdlib/fft/base/fftpack/rffti",
+  "version": "0.0.0",
+  "description": "Initialize a workspace array for performing a real-valued Fourier transform.",
+  "license": "Apache-2.0",
+  "author": {
+    "name": "The Stdlib Authors",
+    "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+  },
+  "contributors": [
+    {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    }
+  ],
+  "main": "./lib",
+  "directories": {
+    "benchmark": "./benchmark",
+    "doc": "./docs",
+    "example": "./examples",
+    "lib": "./lib",
+    "test": "./test"
+  },
+  "types": "./docs/types",
+  "scripts": {},
+  "homepage": "https://github.com/stdlib-js/stdlib",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/stdlib-js/stdlib.git"
+  },
+  "bugs": {
+    "url": "https://github.com/stdlib-js/stdlib/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=0.10.0",
+    "npm": ">2.7.0"
+  },
+  "os": [
+    "aix",
+    "darwin",
+    "freebsd",
+    "linux",
+    "macos",
+    "openbsd",
+    "sunos",
+    "win32",
+    "windows"
+  ],
+  "keywords": [
+    "stdlib",
+    "fft",
+    "fftpack",
+    "rffti",
+    "fourier",
+    "transform",
+    "twiddle",
+    "workspace",
+    "initialization",
+    "real"
+  ],
+  "__stdlib__": {}
+}
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/Makefile b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/Makefile
new file mode 100644
index 000000000000..7ce16281940d
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/Makefile
@@ -0,0 +1,137 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2026 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+endif
+
+# Specify the path to FFTPACK:
+FFTPACK ?=
+
+# Specify a list of FFTPACK source files:
+FFTPACK_SRC ?=
+
+# Determine the OS:
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+
+# Define the program used for compiling C source files:
+ifdef C_COMPILER
+	CC := $(C_COMPILER)
+else
+	CC := gcc
+endif
+
+# Define the command-line options when compiling C files:
+CFLAGS ?= \
+	-std=c99 \
+	-O3 \
+	-Wall \
+	-pedantic
+
+# Determine whether to generate [position independent code][1]:
+#
+# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
+# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
+ifeq ($(OS), WINNT)
+	fPIC ?=
+else
+	fPIC ?= -fPIC
+endif
+
+# List of C targets:
+c_targets := runner.out
+
+
+# RULES #
+
+#/
+# Compiles C source files.
+#
+# @param {string} [C_COMPILER] - C compiler
+# @param {string} [CFLAGS] - C compiler flags
+# @param {(string|void)} [fPIC] - flag indicating whether to generate position independent code
+#
+# @example
+# make
+#
+# @example
+# make all
+#/
+all: $(c_targets)
+
+.PHONY: all
+
+#/
+# Compiles C source files.
+#
+# @private
+# @param {string} CC - C compiler
+# @param {string} CFLAGS - C compiler flags
+# @param {(string|void)} fPIC - flag indicating whether to generate position independent code
+#/
+$(c_targets): %.out: %.c
+	$(QUIET) $(CC) $(CFLAGS) -DFFTPACK_DOUBLE_PRECISION $(fPIC) -o $@ $(FFTPACK_SRC) $< -lm
+
+#/
+# Generates test fixtures.
+#
+# @example
+# make run
+#/
+run: $(c_targets)
+	$(QUIET) ./$<
+
+.PHONY: run
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean:
+	$(QUIET) -rm -f *.o *.out
+
+.PHONY: clean
+
+#/
+# Removes generated test fixtures.
+#
+# @example
+# make clean-fixtures
+#/
+clean-fixtures:
+	$(QUIET) -rm -f *.json
+
+.PHONY: clean-fixtures
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/large.json b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/large.json
new file mode 100644
index 000000000000..01ea1093cdc9
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/large.json
@@ -0,0 +1 @@
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diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/medium.json b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/medium.json
new file mode 100644
index 000000000000..9426aa08c1c5
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/medium.json
@@ -0,0 +1 @@
+{"lengths":[34,49,74,77,101,16,81,113,56,96],"offsets":[0,33,81,154,230,330,345,425,537,592],"twiddles":[0.98297309968390179,0.18374951781657034,0.93247222940435581,0.36124166618715292,0.85021713572961422,0.52643216287735572,0.73900891722065909,0.67369564364655721,0.60263463637925641,0.79801722728023949,0.44573835577653831,0.89516329135506234,0.27366299007208278,0.96182564317281904,0.092268359463302016,0.99573417629503447,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0.99179001382324616,0.127877161684506,0.96729486303902945,0.25365458390950735,0.92691675734602175,0.37526700487937409,0,0.96729486303902945,0.25365458390950735,0.87131870412338941,0.49071755200393785,0.71834935009772771,0.69568255060348638,0,0.92691675734602175,0.37526700487937409,0.71834935009772771,0.69568255060348638,0.404783343122394,0.91441262301581239,0,0.87131870412338941,0.49071755200393785,0.51839256831052516,0.85514276300534608,0.032051577571655332,0.99948621620068789,0,0.80141362186795673,0.59811053049121587,0.28452758663103267,0.95866785303666058,-0.34536505442130727,0.93846842204976055,0,0.71834935009772771,0.69568255060348638,0.032051577571655332,0.99948621620068789,-0.67230089026131656,0.74027799707531572,0,0,0,0,0,0,0,0.99639748854252652,0.084805924475509192,0.98561591034770846,0.16900082032184907,0.96773294693349887,0.25197806138512518,0.94287744546108421,0.33313979474205757,0.91122849038813569,0.4119012482439926,0.87301411316118815,0.48769494381363454,0.82850964924384218,0.55997478613759533,0.77803575431843952,0.62821999729564226,0.72195609395452454,0.69193886897754608,0.66067472339008149,0.75067230525272433,0.59463317630428669,0.80399713036694054,0.52430728355723166,0.85152913773331129,0.45020374481767328,0.89292585814956849,0.37285647778030861,0.92788902729650935,0.29282277127655043,0.95616673473925096,0.21067926999572642,0.97755523894768614,0.12701781974687887,0.99190043525887683,0.042441203196148462,0.99909896620468142,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0.99667258249419322,0.08150928354706316,0.98671247339128887,0.16247613626020579,0.97018595557406451,0.24236173709321232,0.94720301029191012,0.32063446055273548,0.91791658525375941,0.39677341457824244,0,0.98671247339128887,0.16247613626020579,0.94720301029191012,0.32063446055273548,0.88252157678632126,0.4702719069927368,0.79438708541211267,0.60741185247774743,0.68514171496784426,0.72840979565826902,0,0.97018595557406451,0.24236173709321232,0.88252157678632126,0.4702719069927368,0.74223412300426994,0.67014066183755949,0.55768866698682951,0.83005020975508048,0.33988930158261688,0.94046545001381143,0,0.94720301029191012,0.32063446055273548,0.79438708541211267,0.60741185247774743,0.55768866698682951,0.83005020975508048,0.26210168293910224,0.96504026226913986,-0.061161660821842483,0.99812787319336693,0,0.91791658525375941,0.39677341457824244,0.68514171496784426,0.72840979565826902,0.33988930158261688,0.94046545001381143,-0.061161660821842483,0.99812787319336693,-0.45217190728268547,0.89193080800269398,0,0.88252157678632126,0.4702719069927368,0.55768866698682951,0.83005020975508048,0.10182298670383554,0.99480253285700404,-0.37796670142890643,0.92581919002089819,-0.76895052533936181,0.63930828993555178,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0.92387953251128674,0.38268343236508978,0,0,0.70710678118654757,0.70710678118654746,0,0,0.38268343236508984,0.92387953251128674,0,0,0,0,0,0.99699294116779202,0.077492420671930934,0.98798984947680901,0.15451879280784048,0.97304487057982381,0.23061587074244014,0.95224788533841531,0.30532599769511309,0.92572396926889045,0.37819985817164248,0.89363264032341228,0.44879918020046211,0.85616689953026648,0.51669937115186282,0.81355207026296761,0.5814920712880266,0.76604444311897801,0.64278760968653925,0.7139297345578991,0.70021734776716849,0.65752136856906362,0.75343589632766073,0.59715859170278629,0.80212319275504373,0.53320443280169139,0.84598642591984097,0,0.98798984947680901,0.15451879280784048,0.95224788533841531,0.30532599769511309,0.89363264032341228,0.44879918020046211,0.81355207026296761,0.5814920712880266,0.7139297345578991,0.70021734776716849,0.59715859170278629,0.80212319275504373,0.46604351970253893,0.8847617971766577,0.32373394205832112,0.94614815687575038,0.17364817766693041,0.98480775301220802,0.019391331771824435,0.99981197044850145,-0.13533129975013106,0.99080040336484532,-0.28680323271108998,0.9579895123154889,-0.43138606568125326,0.90216742478103773,0,0.97304487057982381,0.23061587074244014,0.89363264032341228,0.44879918020046211,0.76604444311897812,0.64278760968653925,0.59715859170278629,0.80212319275504373,0,0.89363264032341228,0.44879918020046211,0.59715859170278629,0.80212319275504373,0.17364817766693064,0.98480775301220802,-0.28680323271108998,0.9579895123154889,0,0.76604444311897801,0.64278760968653925,0,0.173648177666930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diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/runner.c b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/runner.c
new file mode 100644
index 000000000000..6f783f0bf820
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/runner.c
@@ -0,0 +1,286 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/**
+* Generate FFTPACK test fixtures.
+*
+* ## Notes
+*
+* -   Run this script from the directory in which fixtures should be written.
+*
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+/**
+* Define prototypes for external functions.
+*/
+extern void rffti( int n, double *wsave );
+
+/**
+* Generates a random number on the interval [0,1].
+*
+* @return random number
+*/
+double rand_double( void ) {
+	int r = rand();
+	return (double)r / ( (double)RAND_MAX + 1.0 );
+}
+
+/**
+* Generates an array of pseudorandom integers drawn from a uniform distribution.
+*
+* ## Notes
+*
+* -   WARNING: the method used here is not particularly robust, as some integer values may be sampled more frequently than others.
+*
+*
+* @param out  output array
+* @param len  array length
+* @param a    lower bound (inclusive)
+* @param b    upper bound (exclusive)
+*/
+void rand_array_i32( int *out, const unsigned int len, const int a, const int b ) {
+	unsigned int i;
+	unsigned int r;
+	double delta;
+
+	delta = (double)b - (double)a;
+
+	for ( i = 0; i < len; i++ ) {
+		r = (unsigned int)( delta * rand_double() ); // truncation
+		out[ i ] = (int)( a + r );
+	}
+}
+
+/**
+* Writes an array of doubles to a file as a series of comma-separated values.
+*
+* @param f    file to write to
+* @param x    array of doubles
+* @param len  array length
+*/
+void write_array_f64( FILE *f, const double *x, const unsigned int len ) {
+	unsigned int i;
+
+	for ( i = 0; i < len; i++ ) {
+		fprintf( f, "%.17g", x[ i ] );
+		if ( i < len-1 ) {
+			fprintf( f, "," );
+		}
+	}
+}
+
+/**
+* Writes an array of integers to a file as a series of comma-separated values.
+*
+* @param f    file to write to
+* @param x    array of integers
+* @param len  array length
+*/
+void write_array_i32( FILE *f, const int *x, const unsigned int len ) {
+	unsigned int i;
+
+	for ( i = 0; i < len; i++ ) {
+		fprintf( f, "%d", x[ i ] );
+		if ( i < len-1 ) {
+			fprintf( f, "," );
+		}
+	}
+}
+
+/**
+* Writes a named array of doubles to a file as JSON.
+*
+* @param f     file to write to
+* @param name  array name
+* @param x     data
+* @param len   array length
+*/
+void write_named_array_f64( FILE *f, const char *name, const double *x, const unsigned int len ) {
+	fprintf( f, "\"%s\":[", name );
+	write_array_f64( f, x, len );
+	fprintf( f, "]" );
+}
+
+/**
+* Writes a named array of integers to a file as JSON.
+*
+* @param f     file to write to
+* @param name  array name
+* @param x     data
+* @param len   array length
+*/
+void write_named_array_i32( FILE *f, const char *name, const int *x, const unsigned int len ) {
+	fprintf( f, "\"%s\":[", name );
+	write_array_i32( f, x, len );
+	fprintf( f, "]" );
+}
+
+/**
+* Writes data to a file as JSON.
+*
+* ## Notes
+*
+* -   This function SHOULD be tailored to the input data (e.g., input types, output types, number of arguments, etc) and may vary from use case to use case.
+*
+*
+* @param f          file to write to
+* @param lengths    sequence lengths
+* @param offsets    twiddle offsets
+* @param twiddles   twiddle factors
+* @param num        number of sequence lengths
+* @param total      total number of twiddle values
+*/
+void write_data_as_json( FILE *f, const int *lengths, const int *offsets, const double *twiddles, const unsigned int num, const unsigned int total ) {
+	fprintf( f, "{" );
+	write_named_array_i32( f, "lengths", lengths, num );
+	fprintf( f, "," );
+	write_named_array_i32( f, "offsets", offsets, num );
+	fprintf( f, "," );
+	write_named_array_f64( f, "twiddles", twiddles, total );
+	fprintf( f, "}\n" );
+}
+
+/**
+* Generates test fixtures.
+*
+* @param lengths  sequence lengths
+* @param offsets  twiddle offsets into flat output array
+* @param num      number of sequence lengths
+* @param total    total number of twiddle values
+* @param name     output filename
+*/
+void generate( const int *lengths, const int *offsets, const unsigned int num, const unsigned int total, const char *name ) {
+	unsigned int i;
+	unsigned int j;
+	double *twiddles;
+	double *wsave;
+	FILE *f;
+	int off;
+	int n;
+
+	// Allocate an output array:
+	twiddles = (double*) malloc( total * sizeof(double) );
+	if ( twiddles == NULL ) {
+		printf( "Error allocating memory.\n" );
+		exit( 1 );
+	}
+
+	// Generate fixture data:
+	for ( i = 0; i < num; i++ ) {
+		n = lengths[ i ];
+		wsave = (double*) calloc( 2*n + 15, sizeof(double) );
+		if ( wsave == NULL ) {
+			printf( "Error allocating memory.\n" );
+			exit( 1 );
+		}
+		rffti( n, wsave );
+
+		// Copy twiddle region into flat array (N-1 values starting at wsave[n]):
+		off = offsets[ i ];
+		for ( j = 0; j < (unsigned int)( n - 1 ); j++ ) {
+			twiddles[ off + j ] = wsave[ n + j ];
+		}
+		free( wsave );
+	}
+	// Open a new file:
+	f = fopen( name, "w" );
+	if ( f == NULL ) {
+		printf( "Error opening file.\n" );
+		exit( 1 );
+	}
+
+	// Write data as JSON:
+	write_data_as_json( f, lengths, offsets, twiddles, num, total );
+
+	// Close the file:
+	fclose( f );
+
+	// Free allocated memory:
+	free( twiddles );
+}
+
+/**
+* Computes offsets into a flat twiddle array for each sequence length.
+*
+* @param offsets  output array of offsets
+* @param lengths  sequence lengths
+* @param num      number of sequence lengths
+* @return total number of twiddle values
+*/
+unsigned int compute_offsets( int *offsets, const int *lengths, const unsigned int num ) {
+	unsigned int total;
+	unsigned int i;
+
+	total = 0;
+	for ( i = 0; i < num; i++ ) {
+		offsets[ i ] = total;
+		total += lengths[ i ] - 1;
+	}
+	return total;
+}
+
+/**
+* Main execution sequence.
+*/
+int main( void ) {
+	unsigned int total;
+	unsigned int num;
+	int *lengths;
+	int *offsets;
+
+	// Use the current time to seed the random number generator:
+	srand( time( NULL ) );
+
+	// Define the number of sequence lengths per range:
+	num = 10;
+
+	// Allocate arrays:
+	lengths = (int*) malloc( num * sizeof(int) );
+	if ( lengths == NULL ) {
+		printf( "Error allocating memory.\n" );
+		exit( 1 );
+	}
+	offsets = (int*) malloc( num * sizeof(int) );
+	if ( offsets == NULL ) {
+		printf( "Error allocating memory.\n" );
+		exit( 1 );
+	}
+
+	// Generate fixture data:
+	rand_array_i32( lengths, num, 2, 16 );
+	total = compute_offsets( offsets, lengths, num );
+	generate( lengths, offsets, num, total, "small.json" );
+
+	rand_array_i32( lengths, num, 16, 128 );
+	total = compute_offsets( offsets, lengths, num );
+	generate( lengths, offsets, num, total, "medium.json" );
+
+	rand_array_i32( lengths, num, 128, 1024 );
+	total = compute_offsets( offsets, lengths, num );
+	generate( lengths, offsets, num, total, "large.json" );
+
+	// Free allocated memory:
+	free( lengths );
+	free( offsets );
+
+	return 0;
+}
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/small.json b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/small.json
new file mode 100644
index 000000000000..fbf7013f13bc
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/fixtures/c/fftpack/small.json
@@ -0,0 +1 @@
+{"lengths":[13,13,12,9,14,4,5,5,15,11],"offsets":[0,12,24,35,43,56,59,63,67,81],"twiddles":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0.86602540378443871,0.49999999999999994,0,0.50000000000000011,0.8660254037844386,0,6.123233995736766e-17,1,0,0,0,0.76604444311897801,0.64278760968653925,0,0.17364817766693041,0.98480775301220802,0,0,0,0.90096886790241915,0.43388373911755812,0.62348980185873359,0.7818314824680298,0.22252093395631445,0.97492791218182362,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0.91354545764260087,0.40673664307580015,0.66913060635885824,0.74314482547739424,0,0.66913060635885824,0.74314482547739424,-0.10452846326765333,0.9945218953682734,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}
diff --git a/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/test.js b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/test.js
new file mode 100644
index 000000000000..8173a6ee269a
--- /dev/null
+++ b/lib/node_modules/@stdlib/fft/base/fftpack/rffti/test/test.js
@@ -0,0 +1,231 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var Float64Array = require( '@stdlib/array/float64' );
+var isAlmostSameValue = require( '@stdlib/number/float64/base/assert/is-almost-same-value' );
+var rffti = require( './../lib' );
+
+
+// FIXTURES //
+
+var small = require( './fixtures/c/fftpack/small.json' );
+var medium = require( './fixtures/c/fftpack/medium.json' );
+var large = require( './fixtures/c/fftpack/large.json' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof rffti, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function has an arity of 4', function test( t ) {
+	t.strictEqual( rffti.length, 4, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns a reference to the workspace array', function test( t ) {
+	var workspace;
+	var out;
+	var N;
+
+	N = 8;
+	workspace = new Float64Array( ( 2*N ) + 34 );
+	out = rffti( N, workspace, 1, 0 );
+
+	t.strictEqual( out, workspace, 'same reference' );
+	t.end();
+});
+
+tape( 'the function correctly initializes twiddle factors (small sequence lengths)', function test( t ) {
+	var workspace;
+	var expected;
+	var lengths;
+	var offsets;
+	var ulps;
+	var off;
+	var y;
+	var e;
+	var N;
+	var i;
+	var k;
+
+	lengths = small.lengths;
+	offsets = small.offsets;
+	expected = small.twiddles;
+
+	ulps = 1;
+	for ( k = 0; k < lengths.length; k++ ) {
+		N = lengths[ k ];
+		off = offsets[ k ];
+		workspace = new Float64Array( ( 2*N ) + 34 );
+		rffti( N, workspace, 1, 0 );
+
+		t.strictEqual( workspace[ N ], 0.0, 'returns expected value' );
+		for ( i = 0; i < N-1; i++ ) {
+			y = workspace[ N+i+1 ];
+			e = expected[ off+i ];
+			t.strictEqual( isAlmostSameValue( y, e, ulps ), true, 'within '+ulps+' ULPs. N: '+N+'. y: '+y+'. E: '+e );
+		}
+	}
+	t.end();
+});
+
+tape( 'the function correctly initializes twiddle factors (medium sequence lengths)', function test( t ) {
+	var workspace;
+	var expected;
+	var lengths;
+	var offsets;
+	var ulps;
+	var off;
+	var y;
+	var e;
+	var N;
+	var i;
+	var k;
+
+	lengths = medium.lengths;
+	offsets = medium.offsets;
+	expected = medium.twiddles;
+
+	ulps = 1;
+	for ( k = 0; k < lengths.length; k++ ) {
+		N = lengths[ k ];
+		off = offsets[ k ];
+		workspace = new Float64Array( ( 2*N ) + 34 );
+		rffti( N, workspace, 1, 0 );
+
+		t.strictEqual( workspace[ N ], 0.0, 'returns expected value' );
+		for ( i = 0; i < N-1; i++ ) {
+			y = workspace[ N+i+1 ];
+			e = expected[ off+i ];
+			t.strictEqual( isAlmostSameValue( y, e, ulps ), true, 'within '+ulps+' ULPs. N: '+N+'. y: '+y+'. E: '+e );
+		}
+	}
+	t.end();
+});
+
+tape( 'the function correctly initializes twiddle factors (large sequence lengths)', function test( t ) {
+	var workspace;
+	var expected;
+	var lengths;
+	var offsets;
+	var ulps;
+	var off;
+	var y;
+	var e;
+	var N;
+	var i;
+	var k;
+
+	lengths = large.lengths;
+	offsets = large.offsets;
+	expected = large.twiddles;
+
+	ulps = 1;
+	for ( k = 0; k < lengths.length; k++ ) {
+		N = lengths[ k ];
+		off = offsets[ k ];
+		workspace = new Float64Array( ( 2*N ) + 34 );
+		rffti( N, workspace, 1, 0 );
+
+		t.strictEqual( workspace[ N ], 0.0, 'returns expected value' );
+		for ( i = 0; i < N-1; i++ ) {
+			y = workspace[ N+i+1 ];
+			e = expected[ off+i ];
+			t.strictEqual( isAlmostSameValue( y, e, ulps ), true, 'within '+ulps+' ULPs. N: '+N+'. y: '+y+'. E: '+e );
+		}
+	}
+	t.end();
+});
+
+tape( 'the function does not modify the scratch region of the workspace', function test( t ) {
+	var workspace;
+	var N;
+	var i;
+
+	N = 8;
+	workspace = new Float64Array( ( 2*N ) + 34 );
+
+	for ( i = 0; i < workspace.length; i++ ) {
+		workspace[ i ] = i + 1.0;
+	}
+	rffti( N, workspace, 1, 0 );
+	for ( i = 0; i < N; i++ ) {
+		t.strictEqual( workspace[ i ], i + 1.0, 'returns expected value' );
+	}
+	t.end();
+});
+
+tape( 'the function does not modify the workspace when N is 1', function test( t ) {
+	var workspace;
+	var expected;
+	var N;
+	var i;
+
+	N = 1;
+	workspace = new Float64Array( ( 2*N ) + 34 );
+	for ( i = 0; i < workspace.length; i++ ) {
+		workspace[ i ] = i + 1.0;
+	}
+	expected = new Float64Array( workspace );
+
+	rffti( N, workspace, 1, 0 );
+
+	t.deepEqual( workspace, expected, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function correctly handles stride and offset parameters', function test( t ) {
+	var workspace;
+	var expected;
+	var stride;
+	var offset;
+	var nf;
+	var N;
+	var i;
+
+	N = 8;
+	stride = 2;
+	offset = 3;
+	workspace = new Float64Array( offset + ( ( ( 2*N ) + 34 ) * stride ) );
+
+	rffti( N, workspace, stride, offset );
+
+	t.strictEqual( workspace[ offset + ( 2*N * stride ) ], N, 'returns expected value' );
+
+	nf = workspace[ offset + ( ( ( 2*N ) + 1 ) * stride ) ];
+	t.strictEqual( nf, 2, 'returns expected value' );
+	t.strictEqual( workspace[ offset + ( ( ( 2*N ) + 2 ) * stride ) ], 2, 'returns expected value' );
+	t.strictEqual( workspace[ offset + ( ( ( 2*N ) + 3 ) * stride ) ], 4, 'returns expected value' );
+
+	expected = new Float64Array( ( 2*N ) + 34 );
+	rffti( N, expected, 1, 0 );
+
+	for ( i = 0; i < N-1; i++ ) {
+		t.strictEqual( workspace[ offset + ( ( N+i+1 ) * stride ) ], expected[ N+i+1 ], 'returns expected value' );
+	}
+	t.end();
+});