npm package: @stdlib/math-base-special-rad2deg
Description: Convert an angle from radians to degrees.
Author: The Stdlib Authors
Latest version: 0.2.4

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# rad2deg

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

> Convert an angle from radians to degrees.

<section class="installation">

## Installation

```bash
npm install @stdlib/math-base-special-rad2deg
```

</section>

<section class="usage">

## Usage

```javascript
var rad2deg = require( '@stdlib/math-base-special-rad2deg' );
```

#### rad2deg( x )

Converts an angle from radians to degrees.

```javascript
var d = rad2deg( 3.141592653589793/2.0 );
// returns 90.0

d = rad2deg( -3.141592653589793/4.0 );
// returns -45.0

d = rad2deg( NaN );
// returns NaN
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   Due to finite precision, canonical values may not be returned. For example,

    ```javascript
    var d = rad2deg( 3.141592653589793/6.0 );
    // returns 29.999999999999996
    ```

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var TWO_PI = require( '@stdlib/constants-float64-two-pi' );
var rad2deg = require( '@stdlib/math-base-special-rad2deg' );

var opts = {
    'dtype': 'float64'
};
var r = uniform( 100, 0.0, TWO_PI, opts );

logEachMap( 'radians: %0.4f => degrees: %0.4f', r, rad2deg );
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/math/base/special/rad2deg.h"
```

#### stdlib_base_rad2deg( x )

Converts an angle from radians to degrees.

```c
double x = 3.141592653589793/2.0;
double d = stdlib_base_rad2deg( x );
// returns 90.0

x = -3.141592653589793/4.0;
d = stdlib_base_rad2deg( x );
// returns -45.0
```

The function accepts the following arguments:

-   **x**: `[in] double` input value (in radians).

```c
double stdlib_base_rad2deg( const double x );
```

</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>

<!-- /.notes -->

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

<section class="examples">

### Examples

```c
#include "stdlib/math/base/special/rad2deg.h"
#include "stdlib/constants/float64/two_pi.h"
#include <stdlib.h>
#include <stdio.h>

int main( void ) {
    double x;
    double d;
    int i;

    for ( i = 0; i < 100; i++ ) {
        x = (double)rand() / (double)RAND_MAX * STDLIB_CONSTANT_FLOAT64_TWO_PI;
        d = stdlib_base_rad2deg( x );
        printf( "radians: %lf => degrees: %lf\n", x, d );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/math-base/special/deg2rad`][@stdlib/math/base/special/deg2rad]</span><span class="delimiter">: </span><span class="description">convert an angle from degrees to radians.</span>

</section>

<!-- /.related -->

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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].

</section>

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