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@stdlib/math-base-special-rising-factorial

0.0.5 • Public • Published

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.

Install

`npm i @stdlib/math-base-special-rising-factorial`

stdlib.io

8

Version

0.0.5

Apache-2.0 AND BSL-1.0

38.7 kB

9