flow-cmean

Transform stream factory to calculate arithmetic means for streamed data arrays (chunks).

Installation

$ npm install flow-cmean

API

To create a stream factory,

var meanStream = require( 'flow-cmean' );
 
// Create a new factory:
var mStream = meanStream();

mStream.stream()

To create a new mean stream,

var stream = mStream.stream();

Usage

Methods are chainable.

meanStream()
    .stream()
    .pipe( /* writable stream */ );

Examples

var eventStream = require( 'event-stream' ),
    chunkStream = require( 'flow-chunkify' ),
    mStream = require( 'flow-cmean' );
 
// 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 a new chunkify stream (chunk the data into groups of 100; i.e., 10 chunks):
var cStream = chunkStream()
    .numValues( 100 )
    .stream();
 
// Create a new mean stream:
var stream = mStream().stream();
 
// Pipe the data:
readStream
    .pipe( cStream )
    .pipe( stream )
    .pipe( eventStream.map( function( d, clbk ){
        clbk( null, JSON.stringify( d )+'\n' );
    }))
    .pipe( process.stdout );

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit tests use the Mocha test framework with Chai assertions.

Assuming you have globally 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.