xlogyf

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

Installation

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

Usage

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.

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

Examples

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 ) );
}

C APIs

Usage

#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.

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.

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

Examples

#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 );
    }
}

Notice

This package is part of 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, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.