feat: add blas/ext/base/dwxmy

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Author: anandkaranubc

lib/node_modules/@stdlib/blas/ext/base/dwxmy/README.md

@@ -0,0 +1,356 @@
+<!--
+
+@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.
+
+-->
+
+# dwxmy
+
+> Perform the element-wise operation `w = x * y` for double-precision floating-point strided arrays.
+
+<section class="intro">
+
+This BLAS extension implements the operation
+
+<!-- <equation class="equation" label="eq:wxmy" align="center" raw="\mathbf{w} = \mathbf{x} \odot \mathbf{y}" alt="Equation for wxmy operation."> -->
+
+```math
+\mathbf{w} = \mathbf{x} \odot \mathbf{y}
+```
+
+<!-- </equation> -->
+
+where `⊙` denotes the [Hadamard product][hadamard-product].
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var dwxmy = require( '@stdlib/blas/ext/base/dwxmy' );
+```
+
+#### dwxmy( N, x, strideX, y, strideY, w, strideW )
+
+Performs the element-wise operation `w = x * y` for double-precision floating-point strided arrays.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
+var y = new Float64Array( [ 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+var w = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
+
+dwxmy( x.length, x, 1, y, 1, w, 1 );
+// w => <Float64Array>[ 2.0, 6.0, 12.0, 20.0, 30.0 ]
+```
+
+The function has the following parameters:
+
+-   **N**: number of indexed elements.
+-   **x**: first input [`Float64Array`][@stdlib/array/float64].
+-   **strideX**: stride length for `x`.
+-   **y**: second input [`Float64Array`][@stdlib/array/float64].
+-   **strideY**: stride length for `y`.
+-   **w**: output [`Float64Array`][@stdlib/array/float64].
+-   **strideW**: stride length for `w`.
+
+The `N` and stride parameters determine which elements in the strided arrays are accessed at runtime. For example, to multiply every other element of `x` by every other element of `y`:
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+var y = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+var w = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
+
+dwxmy( 3, x, 2, y, 2, w, 2 );
+// w => <Float64Array>[ 1.0, 0.0, 9.0, 0.0, 25.0, 0.0 ]
+```
+
+Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+// Initial arrays...
+var x0 = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+var y0 = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+var w0 = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
+
+// Create offset views...
+var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+var y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+var w1 = new Float64Array( w0.buffer, w0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+
+dwxmy( 3, x1, 1, y1, 1, w1, 1 );
+// w0 => <Float64Array>[ 0.0, 4.0, 9.0, 16.0, 0.0, 0.0 ]
+```
+
+<!-- lint disable maximum-heading-length -->
+
+#### dwxmy.ndarray( N, x, strideX, offsetX, y, strideY, offsetY, w, strideW, offsetW )
+
+<!-- lint enable maximum-heading-length -->
+
+Performs the element-wise operation `w = x * y` for double-precision floating-point strided arrays using alternative indexing semantics.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
+var y = new Float64Array( [ 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+var w = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
+
+dwxmy.ndarray( x.length, x, 1, 0, y, 1, 0, w, 1, 0 );
+// w => <Float64Array>[ 2.0, 6.0, 12.0, 20.0, 30.0 ]
+```
+
+The function has the following additional parameters:
+
+-   **offsetX**: starting index for `x`.
+-   **offsetY**: starting index for `y`.
+-   **offsetW**: starting index for `w`.
+
+While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying buffer, the offset parameters support indexing semantics based on starting indices. For example, to multiply the last three elements of `x` by the last three elements of `y` and assign to the last three elements of `w`:
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
+var y = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
+var w = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
+
+dwxmy.ndarray( 3, x, 1, x.length-3, y, 1, y.length-3, w, 1, w.length-3 );
+// w => <Float64Array>[ 0.0, 0.0, 9.0, 16.0, 25.0 ]
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   If `N <= 0`, both functions return `w` unchanged.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var dwxmy = require( '@stdlib/blas/ext/base/dwxmy' );
+
+var x = discreteUniform( 10, -100, 100, {
+    'dtype': 'float64'
+});
+console.log( x );
+
+var y = discreteUniform( 10, -100, 100, {
+    'dtype': 'float64'
+});
+console.log( y );
+
+var w = discreteUniform( 10, -100, 100, {
+    'dtype': 'float64'
+});
+console.log( w );
+
+dwxmy( x.length, x, 1, y, 1, w, 1 );
+console.log( w );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- 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 -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/blas/ext/base/dwxmy.h"
+```
+
+#### stdlib_strided_dwxmy( N, \*X, strideX, \*Y, strideY, \*W, strideW )
+
+Performs the element-wise operation `W = X * Y` for double-precision floating-point strided arrays.
+
+```c
+const double x[] = { 1.0, 2.0, 3.0, 4.0 };
+const double y[] = { 2.0, 3.0, 4.0, 5.0 };
+double w[] = { 0.0, 0.0, 0.0, 0.0 };
+
+stdlib_strided_dwxmy( 4, x, 1, y, 1, w, 1 );
+```
+
+The function accepts the following arguments:
+
+-   **N**: `[in] CBLAS_INT` number of indexed elements.
+-   **X**: `[in] double*` first input array.
+-   **strideX**: `[in] CBLAS_INT` stride length for `X`.
+-   **Y**: `[in] double*` second input array.
+-   **strideY**: `[in] CBLAS_INT` stride length for `Y`.
+-   **W**: `[out] double*` output array.
+-   **strideW**: `[in] CBLAS_INT` stride length for `W`.
+
+```c
+void stdlib_strided_dwxmy( const CBLAS_INT N, const double *X, const CBLAS_INT strideX, const double *Y, const CBLAS_INT strideY, double *W, const CBLAS_INT strideW );
+```
+
+<!-- lint disable maximum-heading-length -->
+
+#### stdlib_strided_dwxmy_ndarray( N, \*X, strideX, offsetX, \*Y, strideY, offsetY, \*W, strideW, offsetW )
+
+<!-- lint enable maximum-heading-length -->
+
+Performs the element-wise operation `W = X * Y` for double-precision floating-point strided arrays using alternative indexing semantics.
+
+```c
+const double x[] = { 1.0, 2.0, 3.0, 4.0 };
+const double y[] = { 2.0, 3.0, 4.0, 5.0 };
+double w[] = { 0.0, 0.0, 0.0, 0.0 };
+
+stdlib_strided_dwxmy_ndarray( 4, x, 1, 0, y, 1, 0, w, 1, 0 );
+```
+
+The function accepts the following arguments:
+
+-   **N**: `[in] CBLAS_INT` number of indexed elements.
+-   **X**: `[in] double*` first input array.
+-   **strideX**: `[in] CBLAS_INT` stride length for `X`.
+-   **offsetX**: `[in] CBLAS_INT` starting index for `X`.
+-   **Y**: `[in] double*` second input array.
+-   **strideY**: `[in] CBLAS_INT` stride length for `Y`.
+-   **offsetY**: `[in] CBLAS_INT` starting index for `Y`.
+-   **W**: `[out] double*` output array.
+-   **strideW**: `[in] CBLAS_INT` stride length for `W`.
+-   **offsetW**: `[in] CBLAS_INT` starting index for `W`.
+
+```c
+void stdlib_strided_dwxmy_ndarray( const CBLAS_INT N, const double *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, const double *Y, const CBLAS_INT strideY, const CBLAS_INT offsetY, double *W, const CBLAS_INT strideW, const CBLAS_INT offsetW );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/blas/ext/base/dwxmy.h"
+#include <stdio.h>
+
+int main( void ) {
+    // Create strided arrays:
+    const double x[] = { 1.0, -2.0, 3.0, -4.0, 5.0, -6.0, 7.0, -8.0 };
+    const double y[] = { 2.0, 3.0, -1.0, 4.0, -2.0, 5.0, -3.0, 6.0 };
+    double w[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
+
+    // Specify the number of indexed elements:
+    const int N = 8;
+
+    // Specify strides:
+    const int strideX = 1;
+    const int strideY = 1;
+    const int strideW = 1;
+
+    // Perform the element-wise operation `w = x * y`:
+    stdlib_strided_dwxmy( N, x, strideX, y, strideY, w, strideW );
+
+    // Print the result:
+    for ( int i = 0; i < 8; i++ ) {
+        printf( "w[ %i ] = %lf\n", i, w[ i ] );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- 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/array/float64]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/float64
+
+[hadamard-product]: https://en.wikipedia.org/wiki/Hadamard_product_(matrices)
+
+[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->