@stdlib/math-base-special-gammaln
v0.2.2
Published
Natural logarithm of the gamma function.
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gammaln
Natural logarithm of the gamma function.
Installation
npm install @stdlib/math-base-special-gammaln
Usage
var gammaln = require( '@stdlib/math-base-special-gammaln' );
gammaln( x )
Evaluates the natural logarithm of the gamma function.
var v = gammaln( 2.0 );
// returns 0.0
v = gammaln( 1.0 );
// returns 0.0
v = gammaln( 4.0 );
// returns ~1.792
v = gammaln( -0.5 );
// returns ~1.266
v = gammaln( 0.5 );
// returns ~0.572
v = gammaln( 0.0 );
// returns Infinity
v = gammaln( NaN );
// returns NaN
Examples
var linspace = require( '@stdlib/array-base-linspace' );
var gammaln = require( '@stdlib/math-base-special-gammaln' );
var x = linspace( -10.0, 10.0, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( 'x: %d, f(x): %d', x[ i ], gammaln( x[ i ] ) );
}
See Also
@stdlib/math-base/special/gamma
: gamma function.@stdlib/math-base/special/gammainc
: incomplete gamma function.@stdlib/math-base/special/gammaincinv
: inverse incomplete gamma function.
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.
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