@stdlib/math-base-special-inv
v0.2.3TypeScript
Compute the multiplicative inverse of a double-precision floating-point number.
0/weekUpdated 5 days agoApache-2.0Unpacked: 34.9 KB
Published by The Stdlib Authors
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inv
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> Compute the [multiplicative inverse][multiplicative-inverse] of a double-precision floating-point number.
The [multiplicative inverse][multiplicative-inverse] (or reciprocal) is defined as
Installation
``bash`
npm install @stdlib/math-base-special-inv
Usage
`javascript`
var inv = require( '@stdlib/math-base-special-inv' );
#### inv( x )
Computes the [multiplicative inverse][multiplicative-inverse] of a double-precision floating-point number x.
`javascript
var v = inv( -1.0 );
// returns -1.0
v = inv( 2.0 );
// returns 0.5
v = inv( 0.0 );
// returns Infinity
v = inv( -0.0 );
// returns -Infinity
v = inv( NaN );
// returns NaN
`
Examples
`javascript
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var inv = require( '@stdlib/math-base-special-inv' );
var opts = {
'dtype': 'float64'
};
var x = discreteUniform( 100, -50, 50, opts );
logEachMap( 'inv(%0.4f) = %0.4f', x, inv );
`
*
C APIs
$3
`c`
#include "stdlib/math/base/special/inv.h"
#### stdlib_base_inv( x )
Computes the multiplicative inverse of a double-precision floating-point number.
`c`
double y = stdlib_base_inv( 2.0 );
// returns 0.5
The function accepts the following arguments:
- x: [in] double input value.
`c`
double stdlib_base_inv( const double x );
$3
`c
#include "stdlib/math/base/special/inv.h"
#include
int main( void ) {
const double x[] = { 3.0, 4.0, 5.0, 12.0 };
double y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_inv( x[ i ] );
printf( "inv(%lf) = %lf\n", x[ i ], y );
}
}
`
*
See Also
- [@stdlib/math-base/special/pow][@stdlib/math/base/special/pow]: exponential function.
*
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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[coverage-url]: https://codecov.io/github/stdlib-js/math-base-special-inv?branch=main
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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-inv/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-inv/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-inv/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-base-special-inv/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-base-special-inv/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-base-special-inv/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-base-special-inv/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-base-special-inv/main/LICENSE
[multiplicative-inverse]: https://en.wikipedia.org/wiki/Multiplicative_inverse
[@stdlib/math/base/special/pow]: https://www.npmjs.com/package/@stdlib/math-base-special-pow