# @stdlib/math-base-tools-normhermitepolyf

0.0.1 • Public • Published

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# Normalized Hermite Polynomial

Evaluate a normalized Hermite polynomial using single-precision floating-point arithmetic.

The normalized (aka "probabilist") Hermite polynomials are given by

## Installation

`npm install @stdlib/math-base-tools-normhermitepolyf`

## Usage

`var normhermitepolyf = require( '@stdlib/math-base-tools-normhermitepolyf' );`

#### normhermitepolyf( n, x )

Evaluates a normalized Hermite polynomial of degree `n` using single-precision floating-point arithmetic.

```var v = normhermitepolyf( 1, 1.0 );
// returns 1.0

v = normhermitepolyf( 1, 0.5 );
// returns 0.5

v = normhermitepolyf( 0, 0.5 );
// returns 1.0

v = normhermitepolyf( 2, 0.5 );
// returns -0.75

v = normhermitepolyf( -1, 0.5 );
// returns NaN```

#### normhermitepolyf.factory( n )

Returns a function for evaluating a normalized Hermite polynomial of degree `n` using single-precision floating-point arithmetic.

```var polyval = normhermitepolyf.factory( 2 );

var v = polyval( 0.5 );
// returns -0.75```

## Examples

```var uniform = require( '@stdlib/random-array-uniform' );
var zeros = require( '@stdlib/array-zeros' );
var smap = require( '@stdlib/strided-base-smap' );
var logEach = require( '@stdlib/console-log-each' );
var normhermitepolyf = require( '@stdlib/math-base-tools-normhermitepolyf' );

// Generate random values at which to evaluate a polynomial:
var x = uniform( 10, -50.0, 50.0, {
'dtype': 'float32'
});

// Create a polynomial function of degree 1:
var f = normhermitepolyf.factory( 1 );

// Allocate an output array:
var y = zeros( x.length, 'float32' );

// Evaluate the polynomial:
smap( x.length, x, 1, y, 1, f );
logEach( 'He_%d(%.3f) = %.3f', 1, x, y );

// Create a polynomial function of degree 2:
f = normhermitepolyf.factory( 2 );

// Allocate an output array:
y = zeros( x.length, 'float32' );

// Evaluate the polynomial:
smap( x.length, x, 1, y, 1, f );
logEach( 'He_%d(%.3f) = %.3f', 2, x, y );

// Create a polynomial function of degree 3:
f = normhermitepolyf.factory( 3 );

// Allocate an output array:
y = zeros( x.length, 'float32' );

// Evaluate the polynomial:
smap( x.length, x, 1, y, 1, f );
logEach( 'He_%d(%.3f) = %.3f', 3, x, y );```

## 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.

## Package Sidebar

### Install

`npm i @stdlib/math-base-tools-normhermitepolyf`

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