npm package: @stdlib/math-base-special-exp2
Description: Base 2 exponential function.
Author: The Stdlib Authors
Latest version: 0.3.1

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# exp2

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

> Base `2` [exponential function][exponential-function].

<section class="installation">

## Installation

```bash
npm install @stdlib/math-base-special-exp2
```

</section>

<section class="usage">

## Usage

```javascript
var exp2 = require( '@stdlib/math-base-special-exp2' );
```

#### exp2( x )

Evaluates the base `2` [exponential function][exponential-function].

```javascript
var v = exp2( 3.0 );
// returns 8.0

v = exp2( -9.0 );
// returns ~0.002

v = exp2( 0.0 );
// returns 1.0

v = exp2( NaN );
// returns NaN
```

</section>

<!-- /.usage -->

<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 exp2 = require( '@stdlib/math-base-special-exp2' );

var opts = {
    'dtype': 'float64'
};
var x = uniform( 100, -50.0, 50.0, opts );

logEachMap( '2^%0.4f = %0.4f', x, exp2 );
```

</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/exp2.h"
```

#### stdlib_base_exp2( x )

Evaluates the base `2` [exponential function][exponential-function].

```c
double out = stdlib_base_exp2( 3.0 );
// returns 8.0

out = stdlib_base_exp2( -9.0 );
// returns ~0.002
```

The function accepts the following arguments:

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

```c
double stdlib_base_exp2( 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/exp2.h"
#include <stdlib.h>
#include <stdio.h>

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

    for ( i = 0; i < 100; i++ ) {
        x = ( ( (double)rand() / (double)RAND_MAX ) * 100.0 ) - 50.0;
        v = stdlib_base_exp2( x );
        printf( "2^%lf = %lf\n", x, v );
    }
}
```

</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/exp`][@stdlib/math/base/special/exp]</span><span class="delimiter">: </span><span class="description">natural exponential function.</span>
-   <span class="package-name">[`@stdlib/math-base/special/exp10`][@stdlib/math/base/special/exp10]</span><span class="delimiter">: </span><span class="description">base 10 exponential function.</span>
-   <span class="package-name">[`@stdlib/math-base/special/log2`][@stdlib/math/base/special/log2]</span><span class="delimiter">: </span><span class="description">binary logarithm (base 2).</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

[![Chat][chat-image]][chat-url]

---

## Copyright

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

</section>

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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-exp2/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-exp2/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-exp2/tree/umd
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[exponential-function]: https://en.wikipedia.org/wiki/Exponential_function

<!-- <related-links> -->

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

[@stdlib/math/base/special/exp10]: https://www.npmjs.com/package/@stdlib/math-base-special-exp10

[@stdlib/math/base/special/log2]: https://www.npmjs.com/package/@stdlib/math-base-special-log2

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</section>

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