isinf
Computes for each array element whether an element is infinite.
Installation
$ npm install compute-isinf
For use in the browser, use browserify.
Usage
To use the module,
var isinf = require( 'compute-isinf' );
isinf( arr )
Computes for each array
element whether an element is infinite. The function returns an array
with length equal to that of the input array
. Each output array
element is either 0
or 1
. A value of 1
means that an element is infinite and 0
means that an element is not infinite.
var out = isinf( [ 5, 1/0, 3, 9, -1/0 ] );
// returns [ 0, 1, 0, 0, 1 ]
Examples
var isinf = require( 'compute-isinf' );
// Simulate some data...
var data = new Array( 100 ),
len = data.length,
rand;
// Division by 0 returns infinity...
for ( var i = 0; i < len; i++ ) {
rand = Math.random()*10 - 5;
if ( rand < -4.5 ) {
rand = 0;
}
data[ i ] = 100 / rand;
}
var out = isinf( data );
// Count the number of infinite values detected...
var sum = 0;
for ( var i = 0; i < len; i++ ) {
sum += out[ i ];
}
console.log( 'Count: %d', sum );
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 © 2014. Athan Reines.