Package Exports

compute-gt

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Readme

Greater Than

Computes an element-wise comparison (greater than) of an array.

Installation

$ npm install compute-gt

For use in the browser, use browserify.

Usage

To use the module,

var gt = require( 'compute-gt' );

gt( arr, x )

Computes an element-wise comparison (greater than) for each input array element. x may either be an array of equal length or a single value (number or string).

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 greater than a compared value and 0 means that an element is not greater than a compared value.

var arr = [ 5, 3, 8, 3, 2 ],
    out;

// Single comparison value:
out = gt( arr, 4 );
// returns [ 1, 0, 1, 0, 0 ]

// Array of comparison values:
out = gt( arr, [ 6, 2, 6, 7, 3 ] );
// returns [ 0, 1, 1, 0, 0 ]

Examples

var gt = require( 'compute-gt' ),
    sum = require( 'compute-sum' );

// Simulate some data...
var data = new Array( 100 );

for ( var i = 0; i < data.length; i++ ) {
    data[ i ] = Math.round( Math.random()*100 );
}

var out = gt( data, 50 );

// Count the number of values exceeding 50...
var count = sum( out );

console.log( 'Total: %d', count );

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

MIT license.

compute-gt