npm package: @stdlib/math-base-special-xlogyf
Description: Compute `x * ln(y)` so that the result is `0` if `x = 0` for single-precision floating-point numbers `x` and `y`.
Author: The Stdlib Authors
Latest version: 0.1.1

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# xlogyf

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

> Compute `x * ln(y)` so that the result is `0` if `x = 0` for single-precision floating-point numbers `x` and `y`.

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### xlogyf( x, y )

Computes `x * ln(y)` so that the result is `0` if `x = 0` for single-precision floating-point numbers `x` and `y`.

```javascript
var out = xlogyf( 3.0, 2.0 );
// returns ~2.079

out = xlogyf( 1.5, 5.9 );
// returns ~2.662

out = xlogyf( 0.9, 1.0 );
// returns 0.0

out = xlogyf( 0.0, -2.0 );
// returns 0.0

out = xlogyf( 1.5, NaN );
// returns NaN

out = xlogyf( 0.0, NaN );
// returns NaN

out = xlogyf( NaN, 2.3 );
// returns NaN
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

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

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

var x;
var y;
var i;

for ( i = 0; i < 100; i++ ) {
    x = randu();
    if ( x < 0.5 ) {
        x = 0.0;
    }
    y = ( randu() * 20.0 ) - 5.0;
    console.log( 'xlogyf(%d, %d) = %d', x, y, xlogyf( x, y ) );
}
```

</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/xlogyf.h"
```

#### stdlib_base_xlogyf( x, y )

Computes `x * ln(y)` so that the result is `0` if `x = 0` for single-precision floating-point numbers `x` and `y`.

```c
float v = stdlib_base_xlogyf( 3.0f, 2.0f );
// returns ~2.079f
```

The function accepts the following arguments:

-   **x**: `[in] float` input value.
-   **y**: `[in] float` input value.

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

</section>

<!-- /.usage -->

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<section class="notes">

</section>

<!-- /.notes -->

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

<section class="examples">

### Examples

```c
#include "stdlib/math/base/special/xlogyf.h"
#include <stdio.h>
#include <stdlib.h>

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

    for ( i = 0; i < 100; i++ ) {
        x = ( (float)rand() / (float)RAND_MAX ) * 100.0f;
        y = ( (float)rand() / (float)RAND_MAX ) * 5.0f;
        out = stdlib_base_xlogyf( x, y );
        printf( "xlogyf(%f, %f) = %f\n", x, y, out );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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* * *

## 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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