Package Exports

math-float64-expm1

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Readme

expm1

$NPM version$ $Build Status$ $Coverage Status$ $Dependencies$

Computes exp(x) - 1.

Installation

$ npm install math-float64-expm1

Usage

var expm1 = require( 'math-float64-expm1' );

expm1( x )

Computes exp(x) - 1, where exp(x) is the natural exponential function.

var val = expm1( 0.2 );
// returns ~0.221

val = expm1( -9 );
// returns ~-0.999

val = expm1( 0 );
// returns 0

val = expm1( NaN );
// returns NaN

Examples

var expm1 = require( 'math-float64-expm1' );

var x;
var i;

for ( i = 0; i < 100; i++ ) {
    x = Math.random()*10 - 5;
    console.log( 'e^%d - 1 = %d', x, expm1( x ) );
}

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.

math-float64-expm1