npm package: @stdlib/math-base-special-fmodf
Description: Evaluate the modulus function for single-precision floating-point numbers.
Author: The Stdlib Authors
Latest version: 0.1.1

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# Modulus Function

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

> Evaluate the [Modulus function][modulus-function] for single-precision floating-point numbers.

<section class="intro">

The [modulus function][modulus-function] is defined as

<!-- <equation class="equation" label="eq:modulus_function" align="center" raw="z = x%y" alt="Modulus function"> -->

<!-- </equation> -->

where `x` is the **dividend** and `y` is the **divisor**.

</section>

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<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### fmodf( x, y )

Evaluates the [Modulus function][modulus-function] for single-precision floating-point numbers.

```javascript
var v = fmodf( 8.0, 3.0 );
// returns 2.0

v = fmodf( 9.0, 3.0 );
// returns 0.0

v = fmodf( 8.9, 3.0 );
// returns ~2.9

v = fmodf( NaN, 3.0 );
// returns NaN

v = fmodf( 5.0, NaN );
// returns NaN

v = fmodf( NaN, NaN );
// returns NaN
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

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

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

var opts = {
    'dtype': 'float32'
};
var x = discreteUniform( 100, 0, 100, opts );
var y = discreteUniform( 100, -50, 50, opts );

logEachMap( '%d%%%d = %d', x, y, fmodf );
```

</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/fmodf.h"
```

#### stdlib_base_fmodf( x, y )

Evaluates the [Modulus function][modulus-function] for single-precision floating-point numbers.

```c
float out = stdlib_base_fmodf( 8.9f, 3.0f );
// returns 2.9f

out = stdlib_base_fmodf( 4.0f, 2.0f );
// returns 0.0f
```

The function accepts the following arguments:

-   **x**: `[in] float` dividend.
-   **y**: `[in] float` divisor.

```c
float stdlib_base_fmodf( const float x, const float y );
```

</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/fmodf.h"
#include <stdlib.h>
#include <stdio.h>

int main( void ) {
    float x[ 100 ];
    float y[ 100 ];
    float out;
    int i;

    for ( i = 0; i < 100; i++ ) {
        x[ i ] = ( ( (float)rand() / (float)RAND_MAX ) * 10.0f );
        y[ i ] = ( ( (float)rand() / (float)RAND_MAX ) * 10.0f ) - 5.0f;
    }

    for ( i = 0; i < 100; i++ ) {
        out = stdlib_base_fmodf( x[ i ], y[ i ] );
        printf( "fmodf(%f, %f) = %f\n", x[ i ], y[ i ], out );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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

<section class="related">

</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>

<!-- /.stdlib -->

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[npm-image]: http://img.shields.io/npm/v/@stdlib/math-base-special-fmodf.svg
[npm-url]: https://npmjs.org/package/@stdlib/math-base-special-fmodf

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[stdlib]: https://github.com/stdlib-js/stdlib

[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors

[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-fmodf/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-fmodf/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-fmodf/tree/umd
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[branches-url]: https://github.com/stdlib-js/math-base-special-fmodf/blob/main/branches.md

[modulus-function]: https://en.wikipedia.org/wiki/Remainder

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</section>

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