About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
Apply a modified Givens plane rotation.
To use in Observable,
srotm = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-base-srotm@umd/browser.js' )
To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var srotm = require( 'path/to/vendor/umd/blas-base-srotm/index.js' )
To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/blas-base-srotm@umd/browser.js"></script>
If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.srotm;
})();
</script>
Applies a modified Givens plane rotation.
var Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
var y = new Float32Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );
var param = new Float32Array( [ 0.0, 0.0, 2.0, -3.0, 0.0 ] );
srotm( 2, x, 2, y, 1, param );
// x => <Float32Array>[ ~-17.0, 2.0, ~-18.0, 4.0, 5.0 ]
// y => <Float32Array>[ ~8.0, ~13.0, 8.0, 9.0, 10.0 ]
The function has the following parameters:
- N: number of indexed elements.
- x: first input
Float32Array
. - strideX: index increment for
x
. - y: second input
Float32Array
. - strideY: index increment for
y
. - param: parameters for the modified Givens transformation
The N
and stride parameters determine how values in the strided arrays are accessed at runtime. For example, to apply a modified Givens plane rotation to every other element,
var Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
var y = new Float32Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
var param = new Float32Array( [ 0.0, 0.0, 2.0, -3.0, 0.0 ] );
srotm( 3, x, 2, y, 2, param );
// x => <Float32Array>[ ~-20.0, 2.0, ~-24.0, 4.0, ~-28.0, 6.0 ]
// y => <Float32Array>[ ~9.0, 8.0, ~15.0, 10.0, ~21.0, 12.0 ]
Note that indexing is relative to the first index. To introduce an offset, use typed array
views.
var Float32Array = require( '@stdlib/array-float32' );
// Initial arrays...
var x0 = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
var y0 = new Float32Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );
var param = new Float32Array( [ 1.0, 0.0, 2.0, 3.0, 0.0 ] );
// Create offset views...
var x1 = new Float32Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var y1 = new Float32Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element
srotm( 2, x1, 1, y1, 1, param );
// x0 => <Float32Array>[ 1.0, ~9.0, ~10.0, 4.0, 5.0 ]
// y0 => <Float32Array>[ 6.0, 7.0, 8.0, ~-2.0, ~-3.0 ]
Applies a modified Givens plane rotation using alternative indexing semantics.
var Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
var y = new Float32Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );
var param = new Float32Array( [ 0.0, 0.0, 2.0, -3.0, 0.0 ] );
srotm.ndarray( 2, x, 1, 0, y, 2, 1, param );
// x => <Float32Array>[ ~-20.0, ~-25.0, 3.0, 4.0, 5.0 ]
// y => <Float32Array>[ 6.0, ~9.0, 8.0, ~13.0, 10.0 ]
The function has the following additional parameters:
- offsetX: starting index for
x
. - offsetY: starting index for
y
.
While 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 apply a modified Givens plane rotation to every other element starting from the second element,
var Float32Array = require( '@stdlib/array-float32' );
var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
var y = new Float32Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
var param = new Float32Array( [ 0.0, 0.0, 2.0, -3.0, 0.0 ] );
srotm.ndarray( 3, x, 2, 1, y, 2, 1, param );
// x => <Float32Array>[ 1.0, ~-22.0, 3.0, ~-26.0, 5.0, ~-30.0 ]
// y => <Float32Array>[ 7.0, ~12.0, 9.0, ~18.0, 11.0, ~24.0 ]
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/random-array-discrete-uniform@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/blas-base-srotm@umd/browser.js"></script>
<script type="text/javascript">
(function () {
var opts = {
'dtype': 'float32'
};
var x = discreteUniform( 10, 0, 500, opts );
console.log( x );
var y = discreteUniform( x.length, 0, 255, opts );
console.log( y );
var param = discreteUniform( 5, -5, 5, opts );
console.log( param );
// Apply a plane rotation:
srotm( x.length, x, 1, y, 1, param );
console.log( x );
console.log( y );
})();
</script>
</body>
</html>
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.