0.2.1 • Published 2 months ago
@stdlib/math-base-special-xlogy v0.2.1
xlogy
Compute
x * ln(y)
so that the result is0
ifx = 0
.
Installation
npm install @stdlib/math-base-special-xlogy
Usage
var xlogy = require( '@stdlib/math-base-special-xlogy' );
xlogy( x, y )
Computes x * ln(y)
so that the result is 0
if x = 0
.
var out = xlogy( 3.0, 2.0 );
// returns ~2.079
out = xlogy( 1.5, 5.9 );
// returns ~2.662
out = xlogy( 0.9, 1.0 );
// returns 0.0
out = xlogy( 0.0, -2.0 );
// returns 0.0
out = xlogy( 1.5, NaN );
// returns NaN
out = xlogy( 0.0, NaN );
// returns NaN
out = xlogy( NaN, 2.3 );
// returns NaN
Examples
var randu = require( '@stdlib/random-base-randu' );
var xlogy = require( '@stdlib/math-base-special-xlogy' );
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( 'xlogy(%d, %d) = %d', x, y, xlogy( x, y ) );
}
See Also
@stdlib/math-base/special/ln
: evaluate the natural logarithm of a double-precision floating-point number.@stdlib/math-base/special/xlog1py
: computex * ln(y+1)
so that the result is0
ifx = 0
.
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 © 2016-2024. The Stdlib Authors.