@stdlib/math-base-special-rsqrtf
v0.2.4TypeScript
Compute the reciprocal square root of a single-precision floating-point number.
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Published by The Stdlib Authors
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Reciprocal Square Root
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> Compute the reciprocal of the principal [square root][square-root] of a single-precision floating-point number.
The reciprocal of the principal [square root][square-root] is defined as
Installation
``bash`
npm install @stdlib/math-base-special-rsqrtf
Usage
`javascript`
var rsqrtf = require( '@stdlib/math-base-special-rsqrtf' );
#### rsqrtf( x )
Computes the reciprocal (inverse) square root of a single-precision floating-point number.
`javascript
var v = rsqrtf( 1.0 );
// returns 1.0
v = rsqrtf( 4.0 );
// returns 0.5
v = rsqrtf( 0.0 );
// returns Infinity
v = rsqrtf( NaN );
// returns NaN
v = rsqrtf( Infinity );
// returns 0.0
`
For negative numbers, the reciprocal square root is not defined.
`javascript`
var v = rsqrtf( -4.0 );
// returns NaN
Examples
`javascript
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var rsqrtf = require( '@stdlib/math-base-special-rsqrtf' );
var opts = {
'dtype': 'float32'
};
var x = discreteUniform( 100, 0, 100, opts );
logEachMap( 'rsqrt(%d) = %0.4f', x, rsqrtf );
`
*
C APIs
$3
`c`
#include "stdlib/math/base/special/rsqrtf.h"
#### stdlib_base_rsqrtf( x )
Computes the reciprocal (inverse) [square root][square-root] of a single-precision floating-point number.
`c`
float y = stdlib_base_rsqrtf( 4.0 );
// returns 0.5
The function accepts the following arguments:
- x: [in] float input value.
`c`
float stdlib_base_rsqrtf( const float x );
$3
`c
#include "stdlib/math/base/special/rsqrtf.h"
#include
int main( void ) {
const float x[] = { 3.14f, 9.0f, 0.0f, 0.0f/0.0f };
float y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_rsqrtf( x[ i ] );
printf( "rsqrt(%f) = %f\n", x[ i ], y );
}
}
`
*
See Also
- [@stdlib/math-base/special/rsqrt][@stdlib/math/base/special/rsqrt]: compute the reciprocal square root of a double-precision floating-point number.
- [@stdlib/math-base/special/sqrtf][@stdlib/math/base/special/sqrtf]: compute the principal square root of a single-precision floating-point number.
*
Notice
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
License
See [LICENSE][stdlib-license].
Copyright
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[stdlib]: https://github.com/stdlib-js/stdlib
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/math-base-special-rsqrtf/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-rsqrtf/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-rsqrtf/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-base-special-rsqrtf/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-base-special-rsqrtf/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-base-special-rsqrtf/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-base-special-rsqrtf/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-base-special-rsqrtf/main/LICENSE
[square-root]: https://en.wikipedia.org/wiki/Square_root
[@stdlib/math/base/special/rsqrt]: https://www.npmjs.com/package/@stdlib/math-base-special-rsqrt
[@stdlib/math/base/special/sqrtf]: https://www.npmjs.com/package/@stdlib/math-base-special-sqrtf