❤
npm
Sign UpSign In

lowpassf

0.5.0 • Public • Published

Overview

lowpassf is simple lowpass filter libary for javascipt/node.js. It can be used to smooth real-time data including high frequency noises.

This library provides 2 ways.

  • Simple moving average
  • Weighted moving average

It is licensed under MIT license.

Usage

  var filter = new LowpassFilter();
  //Set average logic from ( filter.LinearWeightAverage/filter.SimpleAverage)
  filter.setLogic(filter.LinearWeightAverage);
    var data = [100, 100, 200, 200, 300, 300]
    var i;
    for (i = 0; i < data.length; i++) {
            //put current value
            filter.putValue(data[i]);
            //Get the latest calculated moving average of the values putted so far
            var filteredValue=filter.getFilteredValue();
        console.log(filteredValue);
    }

Examples

Here is a simple example. https://riversun.github.io/lowpassf/

Run on node.js

You can import library with npm.

Install

npm install --save-dev lowpassf

app.js

var LowpassFilter = require('lowpassf');
 
var filter = new LowpassFilter();
//Set average logic from ( filter.LinearWeightAverage/filter.SimpleAverage)
filter.setLogic(filter.LinearWeightAverage);
 
 
var data = [100, 100, 200, 200, 300, 300]
var i;
var sampleRange = 20;
console.log("Prepare data...");
for (i = 0; i < data.length; i++) {
    console.log("data[" + i + "]=" + data[i]);
}
 
console.log("");
console.log("Start filtering...");
 
//Specify how many items to buffer
filter.setSamplingRange(sampleRange);
 
 
for (i = 0; i < data.length; i++) {
 
    //put current value
    filter.putValue(data[i]);
 
    //get current "filtered" value
    //Get the latest calculated moving average of the values putted so far
    var filteredValue = filter.getFilteredValue();
 
    var logStr = "data[" + i + "]=" + data[i]
        + " added. current filtered val is "
        + filteredValue;
 
    console.log(logStr);
 
}

run on node.js

node app.js

Run on browser

 
<!DOCTYPE html>
<html lang="en">
<body>
<script src="src/LowpassFilter.js"></script>
<script>
    console.log = function (s) {
        document.write(s + "<br>");
    }
    var filter = new LowpassFilter();
        //Set average logic from ( filter.LinearWeightAverage/filter.SimpleAverage)
    filter.setLogic(filter.LinearWeightAverage);
    var data = [100, 100, 200, 200, 300, 300]
    var i;
    var sampleRange = 20;
 
    for (i = 0; i < data.length; i++) {
        console.log("data[" + i + "]=" + data[i]);
    }
    //Specify how many items to buffer
    filter.setSamplingRange(sampleRange);
    for (i = 0; i < data.length; i++) {
        //put current value
        filter.putValue(data[i]);
        //Get the latest calculated moving average of the values putted so far
        var filteredValue=filter.getFilteredValue();
        var logStr = "data[" + i + "]=" + data[i] + " added. current filtered val is " +filteredValue;
        console.log(logStr);
    }
</script> 
</body>
</html>

Readme

Keywords

Package Sidebar

Install

npm i lowpassf

Repository

github.com/riversun/lowpassf

Homepage

github.com/riversun/lowpassf#readme

Weekly Downloads

92

Version

0.5.0

License

MIT

Last publish

Collaborators

  • riversun
Try on RunKit
Report malware