Moving Product
Computes a moving product over an array.
Installation
$ npm install compute-mprod
For use in the browser, use browserify.
Usage
var mprod = ;
mprod( arr, window[, accessor] )
Slides a window
over an array
to compute a moving product. For primitive arrays
,
var data = 1 2 3 4 5 ;var arr = ;// returns [ 2, 6, 12, 20 ]
For object arrays
, provide an accessor function
for accessing array
values
var data ='x':1'x':2'x':3'x':4'x':5;{return dx;}var arr = ;// returns [ 2, 6, 12, 20 ]
Note: the returned array
has length L - W + 1
, where L
is the length of the input array
and W
is the window
size.
Examples
var mprod = ;// Simulate some data...var data = 100 ;for var i = 0; i < datalength; i++data i = Math + 1;// Compute the moving product:var arr = ;console;
To run the example code from the top-level application directory,
$ node ./examples/index.js
Tests
Unit
Unit tests use the Mocha test framework with Chai assertions. 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
License
Copyright
Copyright © 2015. Philipp Burckhardt.