digamma
Digamma function.
The digamma function ψ
is the logarithmic derivative of the gamma function, i.e.
Installation
$ npm install math-digamma
Usage
var digamma = ;
digamma( x )
Evaluates the digamma function.
var v = ;// returns ~1.103v = ;// returns ~-0.577v = ;// returns ~2.252
If x
is 0
or a negative integer
, the function
returns NaN
.
var v = ;// returns NaNv = ;// returns NaNv = ;// returns NaN
If provided NaN
, the function
returns NaN
.
var v = ;// returns NaN
Examples
var digamma = ;var x;var v;var i;for i = 0; i < 10; i++x = Math*10 - 5;v = ;console;
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
Copyright
Copyright © 2016. The Compute.io Authors.