npm package: @stdlib/math-base-special-cpolarf
Description: Compute the absolute value and the phase of a single-precision complex floating-point number.
Author: The Stdlib Authors
Latest version: 0.1.1

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# cpolarf

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Compute the [absolute value][@stdlib/math/base/special/cabsf] and [phase][@stdlib/math/base/special/cphasef] of a single-precision complex floating-point number.

<section class="intro">

</section>

<!-- /.intro -->

<section class="installation">

## Installation

```bash
npm install @stdlib/math-base-special-cpolarf
```

</section>

<section class="usage">

## Usage

```javascript
var cpolarf = require( '@stdlib/math-base-special-cpolarf' );
```

#### cpolarf( z )

Computes the [absolute value][@stdlib/math/base/special/cabsf] and [phase][@stdlib/math/base/special/cphasef] of a single-precision complex floating-point number.

```javascript
var Complex64 = require( '@stdlib/complex-float32-ctor' );

var o = cpolarf( new Complex64( 5.0, 3.0 ) );
// returns [ ~5.83, ~0.5404 ]
```

#### cpolarf.assign( z, out, stride, offset )

Computes the [absolute value][@stdlib/math/base/special/cabsf] and [phase][@stdlib/math/base/special/cphasef] of a single-precision complex floating-point number and assigns results to a provided output array.

```javascript
var Complex64 = require( '@stdlib/complex-float32-ctor' );
var Float32Array = require( '@stdlib/array-float32' );

var out = new Float32Array( 2 );

var v = cpolarf.assign( new Complex64( 5.0, 3.0 ), out, 1, 0 );
// returns <Float32Array>[ ~5.83, ~0.5404 ]

var bool = ( v === out );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var Complex64Array = require( '@stdlib/array-complex64' );
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var cpolarf = require( '@stdlib/math-base-special-cpolarf' );

// Create an array of random numbers:
var opts = {
    'dtype': 'float32'
};
var arr = new Complex64Array( uniform( 200, -100.0, 100.0, opts ) );

// Compute the polar form of each number in the array:
logEachMap( 'cpolarf(%s) = [%s]', arr, cpolarf );
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/math/base/special/cpolarf.h"
```

#### stdlib_base_cpolarf( z, cabsf, cphasef )

Computes the [absolute value][@stdlib/math/base/special/cabsf] and [phase][@stdlib/math/base/special/cphasef] of a single-precision complex floating-point number.

```c
#include "stdlib/complex/float32/ctor.h"
#include "stdlib/complex/float32/real.h"
#include "stdlib/complex/float32/imag.h"

stdlib_complex64_t z = stdlib_complex64( 5.0f, 3.0f );
float cabsf;
float cphasef;
stdlib_base_cpolarf( z, &cabsf, &cphasef );
```

The function accepts the following arguments:

-   **z**: `[in] stdlib_complex64_t` input value.
-   **cabsf**: `[out] float*` destination for the absolute value.
-   **cphasef**: `[out] float*` destination for the phase value in radians.

```c
void stdlib_base_cpolarf( const stdlib_complex64_t z, float *cabsf, float *cphasef );
```

</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>

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<!-- C API usage examples. -->

<section class="examples">

### Examples

```c
#include "stdlib/math/base/special/cpolarf.h"
#include "stdlib/complex/float32/ctor.h"
#include "stdlib/complex/float32/reim.h"
#include <stdio.h>

int main( void ) {
    const stdlib_complex64_t x[] = {
        stdlib_complex64( 3.14f, 1.0f ),
        stdlib_complex64( -3.14f, -1.0f ),
        stdlib_complex64( 0.0f, 0.0f ),
        stdlib_complex64( 0.0f/0.0f, 0.0f/0.0f )
    };

    float cphasef;
    float cabsf;
    float re;
    float im;
    int i;
    for ( i = 0; i < 4; i++ ) {
        stdlib_base_cpolarf( x[i], &cabsf, &cphasef );
        stdlib_complex64_reim( x[i], &re, &im );
        printf( "cpolarf(%f + %fi) => cabsf: %f, cphasef: %f\n", re, im, cabsf, cphasef );
    }
}
```

</section>

<!-- /.examples -->

</section>

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<section class="main-repo" >

* * *

## 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

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[@stdlib/math/base/special/cabsf]: https://www.npmjs.com/package/@stdlib/math-base-special-cabsf

[@stdlib/math/base/special/cphasef]: https://www.npmjs.com/package/@stdlib/math-base-special-cphasef

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