flow-histc

Reduce transform stream which computes a histogram over a stream of numeric data.

Installation

$ npm install flow-histc

Examples

var eventStream = require( 'event-stream' ),
    hStream = require( 'flow-histc' );
 
// Create some data...
var data = new Array( 1000 );
for ( var i = 0; i < data.length; i++ ) {
    data[ i ] = Math.random();
}
 
// Create a readable stream:
var readStream = eventStream.readArray( data );
 
// Create the bin edges... (centering the bins)
var edges = new Array( 22 );
for ( var j = 0; j < edges.length; j++ ) {
    edges[ j ] = -0.025 + j*0.05;
}
 
// Create a new histogram stream:
var stream = hStream()
    .edges( edges )
    .stream();
 
// Create a pipeline:
readStream.pipe( stream )
    .pipe( eventStream.stringify() )
    .pipe( process.stdout );

Tests

Unit tests use the Mocha test framework with Chai assertions.

Assuming you have installed Mocha, execute the following command in the top-level application directory to run the tests:

$ mocha

All new feature development should have corresponding unit tests to validate correct functionality.

License

MIT license.

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Copyright

Copyright © 2014. Athan Reines.