flow-mmedian

Transform stream factory which calculates a sliding-window median (moving-median) over a numeric data stream.

Method 2

Installation

Examples

var eventStream = require('event-stream'),
	medStream = require('flow-mmedian');

// Create an array containing random numbers:
var randoms = new Array( 50 );
for (var i = 0; i < randoms.length; i++) {
    randoms[i] = Math.round(Math.random() * 100);
}

// Create a readable stream from an array:
var randStream = eventStream.readArray(randoms);

// Create a new moving median stream:
var myStream = medStream()
	.window( 7 )
	.stream();

// Pipe the data:
randStream.pipe(myStream)
    .pipe(eventStream.map(function(d,clbk){
		clbk(null,d.toString()+'\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. Rebekah Smith.