README
Rising Factorial
Compute the rising factorial.
Installation
npm install @stdlib/math-base-special-rising-factorial
Usage
var risingFactorial = require( '@stdlib/math-base-special-rising-factorial' );
risingFactorial( x, n )
Evaluates the rising factorial of x
and n
.
var v = risingFactorial( 0.9, 5 );
// returns ~94.766
v = risingFactorial( -9.0, 3 );
// returns -504.0
v = risingFactorial( 0.0, 2 );
// returns 0.0
v = risingFactorial( 3.0, -2 );
// returns 0.5
v = risingFactorial( NaN, 3 );
// returns NaN
v = risingFactorial( 5.0, NaN );
// returns NaN
v = risingFactorial( NaN, NaN );
// returns NaN
The function returns NaN
for non-integer n
.
var v = risingFactorial( 2.0, 1.5 );
// returns NaN
Examples
var randu = require( '@stdlib/random-base-randu' );
var ceil = require( '@stdlib/math-base-special-ceil' );
var risingFactorial = require( '@stdlib/math-base-special-rising-factorial' );
var n;
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = ( randu()*40.0 ) - 20.0;
n = ceil( ( randu()*40.0 ) - 20.0 );
console.log( 'risingFactorial(%d,%d) = %d', x, n, risingFactorial( x, n ) );
}
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 © 2016-2021. The Stdlib Authors.