bench: add example

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---

Author: DivitJain26

lib/node_modules/@stdlib/blas/base/chpmv/examples/index.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';
+
+var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
+var filledarrayBy = require( '@stdlib/array/filled-by' );
+var Complex64 = require( '@stdlib/complex/float32/ctor' );
+var logEach = require( '@stdlib/console/log-each' );
+var chpmv = require( './../lib' );
+
+function rand() {
+	return new Complex64( discreteUniform( 0, 10 ), discreteUniform( -5, 5 ) );
+}
+
+var N = 3;
+
+var x = filledarrayBy( N, 'complex64', rand );
+console.log( x.get( 0 ).toString() );
+
+var y = filledarrayBy( N, 'complex64', rand );
+console.log( y.get( 0 ).toString() );
+
+var AP = filledarrayBy( ( N * ( N + 1 ) / 2 ), 'complex64', rand );
+console.log( AP.get( 0 ).toString() );
+
+var alpha = new Complex64( 2.0, 3.0 );
+console.log( alpha.toString() );
+
+var beta = new Complex64( 3.0, -2.0 );
+console.log( beta.toString() );
+
+chpmv( 'row-major', 'lower', N, alpha, AP, x, 1, beta, y, 1 );
+
+// Print the results:
+logEach( '(%s)', y );
+
+chpmv.ndarray( 'row-major', 'lower', N, alpha, AP, 1, 0, x, 1, 0, beta, y, 1, 0 );
+
+// Print the results:
+logEach( '(%s)', y );