feat: add blas/ext/base/ndarray/gapx

lib/node_modules/@stdlib/blas/ext/base/ndarray/gapx/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# gapx
+
+> Add a scalar constant to each element in an ndarray.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var gapx = require( '@stdlib/blas/ext/base/ndarray/gapx' );
+```
+
+#### gapx( x, alpha )
+
+Adds a scalar constant to each element in an ndarray.
+
+```javascript
+var ndarray = require( '@stdlib/ndarray/ctor' );
+
+var xbuf = [ 1.0, 2.0, 3.0, 4.0 ];
+var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+
+var out = gapx( x, 5.0 );
+// returns <ndarray>[ 6.0, 7.0, 8.0, 9.0 ]
+```
+
+The function has the following parameters:
+
+-   **x**: input ndarray.
+-   **alpha**: scalar constant.
+
+Note that indexing is relative to the first index. To introduce an offset, use [`ndarray`][@stdlib/ndarray/ctor] view creation.
+
+```javascript
+var ndarray = require( '@stdlib/ndarray/ctor' );
+
+// Initial array:
+var xbuf = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+
+// Create an ndarray view:
+var x = new ndarray( 'generic', xbuf, [ 3 ], [ 1 ], 2, 'row-major' );
+
+var out = gapx( x, 5.0 );
+// returns <ndarray>[ 8.0, 9.0, 10.0 ]
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   The function **mutates** the input ndarray.
+-   The function supports generic arrays and typed arrays.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var ndarray = require( '@stdlib/ndarray/ctor' );
+var gapx = require( '@stdlib/blas/ext/base/ndarray/gapx' );
+
+var xbuf = discreteUniform( 10, 0, 100, {
+    'dtype': 'generic'
+});
+var x = new ndarray( 'generic', xbuf, [ 10 ], [ 1 ], 0, 'row-major' );
+
+console.log( x.data );
+
+gapx( x, 5.0 );
+
+console.log( x.data );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- 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">
+
+[@stdlib/ndarray/ctor]: https://github.com/stdlib-js/ndarray-ctor
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/blas/ext/base/ndarray/gapx/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var ndarray = require( '@stdlib/ndarray/ctor' );
+var pkg = require( './../package.json' ).name;
+var gapx = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var x;
+
+	x = new ndarray( 'generic', discreteUniform( len, -100, 100, {
+		'dtype': 'generic'
+	}), [ len ], [ 1 ], 0, 'row-major' );
+
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var z;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			z = gapx( x, 5.0 );
+			if ( isnan( z.data[ i % len ] ) ) {
+				b.fail( 'should not return NaN' );
+			}
+		}
+		b.toc();
+		if ( isnan( z.data[ i % len ] ) ) {
+			b.fail( 'should not return NaN' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+		f = createBenchmark( len );
+		bench( pkg+':len='+len, f );
+	}
+}
+
+main();

lib/node_modules/@stdlib/blas/ext/base/ndarray/gapx/docs/repl.txt

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+{{alias}}( x, alpha )
+    Adds a scalar constant to each element in an ndarray.
+
+    Parameters
+    ----------
+    x: ndarray
+        Input ndarray.
+
+    alpha: number
+        Scalar constant.
+
+    Returns
+    -------
+    out: ndarray
+        Input ndarray.
+
+    Examples
+    --------
+    > var xbuf = [ 1.0, 2.0, 3.0, 4.0 ];
+    > var x = {{alias:@stdlib/ndarray/ctor}}( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+    > {{alias}}( x, 5.0 )
+    <ndarray>[ 6.0, 7.0, 8.0, 9.0 ]
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/blas/ext/base/ndarray/gapx/docs/types/index.d.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 { ndarray } from '@stdlib/types/ndarray';
+
+/**
+* Adds a scalar constant to each element in an ndarray.
+*
+* @param x - input ndarray
+* @param alpha - scalar constant
+* @returns input ndarray
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/ctor' );
+*
+* var xbuf = [ 1.0, 2.0, 3.0, 4.0 ];
+* var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var out = gapx( x, 5.0 );
+* // returns <ndarray>[ 6.0, 7.0, 8.0, 9.0 ]
+*/
+declare function gapx( x: ndarray, alpha: number ): ndarray;
+
+
+// EXPORTS //
+
+export = gapx;

lib/node_modules/@stdlib/blas/ext/base/ndarray/gapx/docs/types/test.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 gapx = require( './index' );
+
+
+// TESTS //
+
+// The function returns an ndarray...
+{
+	const x: any = null;
+	gapx( x, 5.0 ); // $ExpectType ndarray
+}
+
+// The compiler throws an error if the function is provided a first argument which is not an ndarray...
+{
+	gapx( 123, 5.0 ); // $ExpectError
+	gapx( true, 5.0 ); // $ExpectError
+	gapx( false, 5.0 ); // $ExpectError
+	gapx( null, 5.0 ); // $ExpectError
+	gapx( undefined, 5.0 ); // $ExpectError
+	gapx( '5', 5.0 ); // $ExpectError
+	gapx( [ '1', '2' ], 5.0 ); // $ExpectError
+	gapx( {}, 5.0 ); // $ExpectError
+	gapx( ( x: number ): number => x, 5.0 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a second argument which is not a number...
+{
+	const x: any = null;
+	gapx( x, '5' ); // $ExpectError
+	gapx( x, true ); // $ExpectError
+	gapx( x, false ); // $ExpectError
+	gapx( x, null ); // $ExpectError
+	gapx( x, undefined ); // $ExpectError
+	gapx( x, [ '1' ] ); // $ExpectError
+	gapx( x, {} ); // $ExpectError
+	gapx( x, ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	const x: any = null;
+	gapx(); // $ExpectError
+	gapx( x ); // $ExpectError
+	gapx( x, 5.0, 10 ); // $ExpectError
+}

lib/node_modules/@stdlib/blas/ext/base/ndarray/gapx/examples/index.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 ndarray = require( '@stdlib/ndarray/ctor' );
+var gapx = require( './../lib' );
+
+var xbuf = discreteUniform( 10, 0, 100, {
+	'dtype': 'generic'
+});
+var x = new ndarray( 'generic', xbuf, [ 10 ], [ 1 ], 0, 'row-major' );
+
+console.log( x.data );
+
+gapx( x, 5.0 );
+
+console.log( x.data );