diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
new file mode 100644
index 000000000000..a32875fbc032
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/README.md
@@ -0,0 +1,184 @@
+
+
+# dlaisnan
+
+> LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.
+
+
+
+## Usage
+
+```javascript
+var dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
+```
+
+#### dlaisnan( DIN1, DIN2 )
+
+Tests input for NaN by comparing two double-precision floating-point arguments for inequality.
+
+```javascript
+var bool = dlaisnan( NaN, NaN );
+// returns true
+
+bool = dlaisnan( NaN, 5.0 );
+// returns true
+
+bool = dlaisnan( 5.0, 5.0 );
+// returns false
+```
+
+The function has the following parameters:
+
+- **DIN1**: first input number.
+- **DIN2**: second input number.
+
+
+
+
+
+
+
+## Notes
+
+- `dlaisnan()` corresponds to the [LAPACK][lapack] auxiliary routine [`dlaisnan`][lapack-dlaisnan].
+- This routine is not for general use. It exists solely to avoid over-optimization in [`disnan`][lapack-disnan].
+- `dlaisnan` checks for NaNs by comparing its two arguments for inequality. `NaN` is the only floating-point value where `NaN !== NaN` returns `true`. To check for NaNs, pass the same variable as both arguments (i.e., `dlaisnan( x, x )`).
+- The function returns `true` whenever the two arguments are unequal, not only when one is `NaN`. This matches the Fortran reference implementation which simply returns `DIN1.NE.DIN2`.
+
+
+
+
+
+
+
+## Examples
+
+
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
+
+var opts = {
+ 'dtype': 'float64'
+};
+var x = discreteUniform( 100, -50, 50, opts );
+var y = discreteUniform( 100, -50, 50, opts );
+
+logEachMap( 'dlaisnan( %d, %d ) = %s', x, y, dlaisnan );
+```
+
+
+
+
+
+
+
+* * *
+
+
+
+## C APIs
+
+
+
+
+
+
+
+
+
+
+
+### Usage
+
+```c
+TODO
+```
+
+#### TODO
+
+TODO.
+
+```c
+TODO
+```
+
+TODO
+
+```c
+TODO
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+### Examples
+
+```c
+TODO
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+[lapack]: https://www.netlib.org/lapack/explore-html/
+
+[lapack-dlaisnan]: https://www.netlib.org/lapack/explore-html/d3/d22/group__laisnan_gad49d1fe3d6890e9c4f60e0429abab3c9.html
+
+[lapack-disnan]: https://www.netlib.org/lapack/explore-html/d0/d4c/group__isnan_ga7aa3164d5df8d883754b0a70e9c7209c.html
+
+
+
+
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
new file mode 100644
index 000000000000..5e2eb4b29344
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/benchmark/benchmark.js
@@ -0,0 +1,56 @@
+/**
+* @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 uniform = require( '@stdlib/random/array/uniform' );
+var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
+var pkg = require( './../package.json' ).name;
+var dlaisnan = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+ var len;
+ var x;
+ var y;
+ var z;
+ var i;
+
+ len = 100;
+ x = uniform( len, -50, 50 );
+ y = uniform( len, -50, 50 );
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ z = dlaisnan( x[ i % len ], y[ i % len ] );
+ if ( typeof z !== 'boolean' ) {
+ b.fail( 'should return a boolean' );
+ }
+ }
+ b.toc();
+ if ( !isBoolean( z ) ) {
+ b.fail( 'should return a boolean' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
new file mode 100644
index 000000000000..5553849e3739
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/repl.txt
@@ -0,0 +1,29 @@
+
+{{alias}}( DIN1, DIN2 )
+ Tests input for NaN by comparing two double-precision floating-point
+ arguments for inequality.
+
+ Parameters
+ ----------
+ DIN1: number
+ First input number.
+
+ DIN2: number
+ Second input number.
+
+ Returns
+ -------
+ bool: boolean
+ Boolean indicating whether the arguments are unequal.
+
+ Examples
+ --------
+ > var bool = {{alias}}( NaN, NaN )
+ true
+ > bool = {{alias}}( NaN, 5.0 )
+ true
+ > bool = {{alias}}( 5.0, 5.0 )
+ false
+
+ See Also
+ --------
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
new file mode 100644
index 000000000000..a42bafe5bfe6
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/index.d.ts
@@ -0,0 +1,45 @@
+/*
+* @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
+
+/**
+* LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.
+*
+* @param DIN1 - first input number
+* @param DIN2 - second input number
+* @returns boolean indicating whether the arguments are unequal
+*
+* @example
+* var bool = dlaisnan( NaN, NaN );
+* // returns true
+*
+* @example
+* var bool = dlaisnan( NaN, 5.0 );
+* // returns true
+*
+* @example
+* var bool = dlaisnan( 5.0, 5.0 );
+* // returns false
+*/
+declare function dlaisnan( DIN1: number, DIN2: number ): boolean;
+
+
+// EXPORTS //
+
+export = dlaisnan;
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
new file mode 100644
index 000000000000..8115794c5bfa
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/docs/types/test.ts
@@ -0,0 +1,56 @@
+/*
+* @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 dlaisnan = require( './index' );
+
+
+// TESTS //
+
+// The function returns a boolean...
+{
+ dlaisnan( 8, 2 ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the function is provided values other than two numbers...
+{
+ dlaisnan( true, 3 ); // $ExpectError
+ dlaisnan( false, 2 ); // $ExpectError
+ dlaisnan( '5', 1 ); // $ExpectError
+ dlaisnan( [], 1 ); // $ExpectError
+ dlaisnan( {}, 2 ); // $ExpectError
+ dlaisnan( ( x: number ): number => x, 2 ); // $ExpectError
+
+ dlaisnan( 9, true ); // $ExpectError
+ dlaisnan( 9, false ); // $ExpectError
+ dlaisnan( 5, '5' ); // $ExpectError
+ dlaisnan( 8, [] ); // $ExpectError
+ dlaisnan( 9, {} ); // $ExpectError
+ dlaisnan( 8, ( x: number ): number => x ); // $ExpectError
+
+ dlaisnan( [], true ); // $ExpectError
+ dlaisnan( {}, false ); // $ExpectError
+ dlaisnan( false, '5' ); // $ExpectError
+ dlaisnan( {}, [] ); // $ExpectError
+ dlaisnan( '5', ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided insufficient arguments...
+{
+ dlaisnan(); // $ExpectError
+ dlaisnan( 3 ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
new file mode 100644
index 000000000000..92e8b0037ed0
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/examples/index.js
@@ -0,0 +1,31 @@
+/**
+* @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 discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var dlaisnan = require( './../lib' );
+
+var opts = {
+ 'dtype': 'float64'
+};
+var x = discreteUniform( 100, -50, 50, opts );
+var y = discreteUniform( 100, -50, 50, opts );
+
+logEachMap( 'dlaisnan( %d, %d ) = %s', x, y, dlaisnan );
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
new file mode 100644
index 000000000000..ba21fca5cdb5
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/index.js
@@ -0,0 +1,46 @@
+/**
+* @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';
+
+/**
+* LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.
+*
+* @module @stdlib/lapack/base/dlaisnan
+*
+* @example
+* var dlaisnan = require( '@stdlib/lapack/base/dlaisnan' );
+*
+* var bool = dlaisnan( NaN, NaN );
+* // returns true
+*
+* bool = dlaisnan( NaN, 5.0 );
+* // returns true
+*
+* bool = dlaisnan( 5.0, 5.0 );
+* // returns false
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.js
new file mode 100644
index 000000000000..6ecbad7ad343
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/lib/main.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';
+
+// MAIN //
+
+/**
+* Tests input for NaN by comparing two double-precision floating-point arguments for inequality.
+*
+* ## Notes
+*
+* - This routine exists solely to avoid over-optimization in `disnan`.
+*
+* @param {number} DIN1 - first input number
+* @param {number} DIN2 - second input number
+* @returns {boolean} boolean indicating whether the arguments are unequal
+*
+* @example
+* var bool = dlaisnan( NaN, NaN );
+* // returns true
+*
+* @example
+* var bool = dlaisnan( NaN, 5.0 );
+* // returns true
+*
+* @example
+* var bool = dlaisnan( 5.0, 5.0 );
+* // returns false
+*/
+function dlaisnan( DIN1, DIN2 ) {
+ return ( DIN1 !== DIN2 );
+}
+
+
+// EXPORTS //
+
+module.exports = dlaisnan;
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json b/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
new file mode 100644
index 000000000000..bec346c5109f
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/package.json
@@ -0,0 +1,68 @@
+{
+ "name": "@stdlib/lapack/base/dlaisnan",
+ "version": "0.0.0",
+ "description": "LAPACK auxiliary routine to test input for NaN by comparing two double-precision floating-point arguments for inequality.",
+ "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",
+ "stdmath",
+ "mathematics",
+ "math",
+ "lapack",
+ "dlaisnan",
+ "nan",
+ "isnan",
+ "test",
+ "inequality",
+ "linear",
+ "algebra",
+ "subroutines",
+ "float64",
+ "double"
+ ]
+}
diff --git a/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
new file mode 100644
index 000000000000..d63c400ae447
--- /dev/null
+++ b/lib/node_modules/@stdlib/lapack/base/dlaisnan/test/test.js
@@ -0,0 +1,139 @@
+/**
+* @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 PINF = require( '@stdlib/constants/float64/pinf' );
+var NINF = require( '@stdlib/constants/float64/ninf' );
+var dlaisnan = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof dlaisnan, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function has an arity of 2', function test( t ) {
+ t.strictEqual( dlaisnan.length, 2, 'returns expected value' );
+ t.end();
+});
+
+tape( 'the function returns `true` when either argument is NaN', function test( t ) {
+ var bool;
+
+ bool = dlaisnan( NaN, NaN );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( NaN, 5.0 );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( 5.0, NaN );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( NaN, 0.0 );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( 0.0, NaN );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( NaN, PINF );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( NINF, NaN );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns `false` when both arguments are equal non-NaN values', function test( t ) {
+ var bool;
+
+ bool = dlaisnan( 5.0, 5.0 );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ bool = dlaisnan( 0.0, 0.0 );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ bool = dlaisnan( -0.0, -0.0 );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ bool = dlaisnan( -0.0, 0.0 );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ bool = dlaisnan( PINF, PINF );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ bool = dlaisnan( NINF, NINF );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ bool = dlaisnan( -3.14, -3.14 );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns `true` when both arguments are unequal non-NaN values', function test( t ) {
+ var bool;
+
+ bool = dlaisnan( 1.0, 2.0 );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( -1.0, 1.0 );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( PINF, NINF );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ bool = dlaisnan( 0.0, 1.0 );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns expected values when passed the same variable as both arguments', function test( t ) {
+ var bool;
+ var x;
+
+ x = NaN;
+ bool = dlaisnan( x, x );
+ t.strictEqual( bool, true, 'returns expected value' );
+
+ x = 5.0;
+ bool = dlaisnan( x, x );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ x = 0.0;
+ bool = dlaisnan( x, x );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ x = -0.0;
+ bool = dlaisnan( x, x );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ x = PINF;
+ bool = dlaisnan( x, x );
+ t.strictEqual( bool, false, 'returns expected value' );
+
+ t.end();
+});