math-erfc

erfc

Complementary error function.

The complementary error function is defined as

The complementary error function can also be expressed using Craig's formula

Installation

$ npm install math-erfc

Usage

var erfc = require( 'math-erfc' );

erfc( x )

Evaluates the complementary error function.

var y = erfc( 2 );
// returns ~0.0047
 
y = erfc( -1 );
// returns ~1.8427
 
y = erfc( Number.POSITIVE_INFINITY );
// returns 0
 
y = erfc( Number.NEGATIVE_INFINITY );
// returns 2

If provided NaN, the function returns NaN.

var y = erfc( NaN );
// returns NaN

Examples

var linspace = require( 'compute-linspace' );
var erfc = require( 'math-erfc' );
 
var x = linspace( -10, 10, 100 );
var y;
var i;
 
for ( i = 0; i < x.length; i++ ) {
    y = erfc( x[ i ] );
    console.log( 'x: %d, erfc(x): %d', x[ i ], y );
}

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

$ node ./examples/index.js

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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

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License

MIT license.

Copyright

Copyright © 2016. The Compute.io Authors.