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math-erfcinv

v1.0.0

Published

Inverse complementary error function.

Downloads

20

Readme

erfcinv

NPM version Build Status Coverage Status Dependencies

Inverse complementary error function.

The inverse complementary error function is defined as

where erf^{-1}(z) is the inverse error function.

Installation

$ npm install math-erfcinv

Usage

var erfcinv = require( 'math-erfcinv' );

erfcinv( x )

Evaluates the inverse complementary error function.

var y = erfcinv( 0.5 );
// returns ~0.4769

y = erfcinv( 0.8 );
// returns ~0.1791

y = erfcinv( 0 );
// returns +infinity

y = erfcinv( 2 );
// returns -infinity

The domain of x is restricted to [0,2]. If x is outside this interval, the function will throw a RangeError.

var y = erfcinv( -3.14 );
// throws <Error>

If provided NaN, the function returns NaN.

var y = erfcinv( NaN );
// returns NaN

Examples

var linspace = require( 'compute-linspace' );
var erfcinv = require( 'math-erfcinv' );

var x = linspace( 0, 2, 100 );
var y;
var i;

for ( i = 0; i < x.length; i++ ) {
	y = erfcinv( x[ i ] );
	console.log( 'x: %d, erfcinv(x): %d', x[ i ], y );
}

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit

This repository uses tape for unit tests. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

Browser Support

This repository uses Testling for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:

$ make test-browsers

To view the tests in a local web browser,

$ make view-browser-tests

License

MIT license.

Copyright

Copyright © 2016. The Compute.io Authors.