feat: add blas/base/drotmg

lib/node_modules/@stdlib/blas/base/drotmg/README.md

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+<!--
+
+@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.
+
+-->
+
+# drotmg
+
+> Construct a Given plane rotation.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var drotmg = require( '@stdlib/blas/base/drotmg' );
+```
+
+#### drotmg( d1, d2, x1, y1 )
+
+Constructs a Given plane rotation provided four double-precision floating-point values `d1`, `d2`, `x1` and `y1`.
+
+```javascript
+var out = drotmg( 5.0, 4.0, 1.0, -2.0 );
+// returns <Float64Array>[ 1.0, -0.625, 0.0, 0.0, -0.5 ]
+```
+
+The function has the following parameters:
+
+-   **d1**: scaling factor for the first vector component.
+-   **d2**: scaling factor for the second vector component.
+-   **x1**: first component of the first vector.
+-   **y1**: first component of the second vector.
+
+#### drotmg.assign( d1, d2, x1, y1, out, stride, offset )
+
+Constructs a Given plane rotation provided two double-precision floating-point values d1, d2, x1 and y1 and assigns results to an output array.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var out = new Float64Array( 5 );
+
+var y = drotmg.assign( 5.0, 4.0, 1.0, -2.0, out, 1, 0 );
+// returns <Float64Array>[ 1.0, -0.625, 0.0, 0.0, -0.5 ]
+
+var bool = ( y === out );
+// returns true
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   `drotmg()` corresponds to the [BLAS][blas] level 1 function [`drotmg`][drotmg].
+
+</section>
+
+<!-- /.notes -->
+
+## Examples
+
+<section class="examples">
+
+```javascript
+var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
+var drotmg = require( '@stdlib/blas/base/drotmg' );
+
+var out;
+var y1;
+var x1;
+var d2;
+var d1;
+var i;
+for ( i = 0; i < 100; i++ ) {
+    d1 = discreteUniform( -5, 5 );
+    d2 = discreteUniform( -5, 5 );
+    x1 = discreteUniform( -5, 5 );
+    y1 = discreteUniform( -5, 5 );
+    out = drotmg( d1, d2, x1, y1 );
+    console.log( out );
+}
+```
+
+</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/base/drotmg.h"
+```
+
+#### c_drotmg( d1, d2, x1, y1, \*Out, strideOut )
+
+Constructs a Given plane rotation provided four double-precision floating-point values `d1`, `d2`, `x1` & `y1`and assigns results to an output array.
+
+
+```c
+double Out[5];
+
+c_drotmg( 5.0, 4.0, 1.0, -2.0, Out, 1 );
+// Out => <Float64Array>[ 1.0, -0.625, 0.0, 0.0, -0.5]
+```
+
+The function accepts the following arguments:
+
+-   **d1**: `[in] double` scaling factor for the first vector component.
+-   **d2**: `[in] double` scaling factor for the second vector component.
+-   **x1**: `[in] double` first component of the first vector.
+-   **y1**: `[in] double` first component of the second vector.
+-   **Out**: `[inout] double*` output array.
+-   **strideOut**: `[in] CBLAS_INT` stride length for `Out`.
+
+
+```c
+void c_drotmg( double d1, double d2, double x1, double y1, double* Out, const CBLAS_INT strideOut );
+```
+
+#### c_drotmg_assign( d1, d2, x1, y1, \*Out, strideOut, offsetOut )
+
+Constructs a Given plane rotation provided four double-precision floating-point values `d1`, `d2`, `x1` & `y1`and assigns results to an output array using alternative indexing semantics..
+
+```c
+double Out[5];
+
+c_drotmg( 5.0, 4.0, 1.0, -2.0, Out, 1, 0 );
+// Out => <Float64Array>[ 1.0, -0.625, 0.0, 0.0, -0.5]
+```
+
+The function accepts the following arguments:
+
+-   **d1**: `[in] double` scaling factor for the first vector component.
+-   **d2**: `[in] double` scaling factor for the second vector component.
+-   **x1**: `[in] double` first component of the first vector.
+-   **y1**: `[in] double` first component of the second vector.
+-   **Out**: `[inout] double*` output array.
+-   **strideOut**: `[in] CBLAS_INT` stride length for `Out`.
+-   **offsetOut**: `[in] CBLAS_INT` starting index for `Out`.
+
+Given transformation.
+
+```c
+void c_drotmg_assign( double d1, double d2, double x1, double y1, double* Out, const CBLAS_INT strideOut, const CBLAS_INT offsetOut );
+```
+
+</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/base/drotmg.h"
+#include <stdio.h>
+
+int main( void ) {
+    const double d1 = 5.0;
+    const double d2 = 4.0;
+    const double x1 = 1.0;
+    const double y1 = -2.0;
+    int i;
+
+    // Create strided arrays:
+    double out[ 5 ];
+
+    // Specify stride lengths:
+    const int strideOut = 1;
+
+    // Apply plane rotation:
+    c_drotmg( d1, d2, x1, y1, out, strideOut );
+
+    // Print the result:
+    for ( i = 0; i < 5; i++ ) {
+        printf( "out[%d] =  %f\n", i, out[ i ] );
+    }
+
+    // Apply plane rotation
+    c_drotmg_assign( d1, d2, x1, y1, out, strideOut, 0 );
+
+    // Print the result:
+    for ( i = 0; i < 5; i++ ) {
+        printf( "out[%d] =  %f\n", i, out[ 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">
+
+[blas]: http://www.netlib.org/blas
+
+[drotmg]: http://www.netlib.org/lapack/explore-html/df/d28/group__single__blas__level1.html
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/blas/base/drotmg/benchmark/benchmark.assign.js

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+/**
+* @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 discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var Float64Array = require( '@stdlib/array/float64' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var drotmg = require( './../lib/assign.js' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'float64'
+};
+
+
+// MAIN //
+
+bench( format( '%s:assign', pkg ), function benchmark( b ) {
+	var out;
+	var d1;
+	var d2;
+	var x1;
+	var y1;
+	var z;
+	var i;
+
+	d1 = discreteUniform( 100, -5, 5, options );
+	d2 = discreteUniform( 100, -5, 5, options );
+	x1 = discreteUniform( 100, -5, 5, options );
+	y1 = discreteUniform( 100, -5, 5, options );
+	out = new Float64Array( 5 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		z = drotmg( d1[ i%d1.length ], d2[ i%d2.length ], x1[ i%x1.length ], y1[ i%y1.length ], out, 1, 0 ); // eslint-disable-line max-len
+		if ( typeof z !=='object' ) {
+			b.fail( 'should return an array' );
+		}
+	}
+	b.toc();
+	if ( isnan( z[ i%5 ] ) ) {
+		b.fail( 'should return the output array' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});