Google Git
Sign in
eclipse / gerrit / www.eclipse.org / january / b8adda6107b966e52d07277a5b6a8105f676488d / . / apidocs / 2.0.2 / apidocs / src-html / org / eclipse / january / dataset / RunningAverage.html
blob: 19e5d35432b33ff75df0a9e5cc1ba0448ce75e71 [file] [log] [blame]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/*-<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright 2015, 2016 Diamond Light Source Ltd.<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * All rights reserved. This program and the accompanying materials<a name="line.4"></a>
<span class="sourceLineNo">005</span> * are made available under the terms of the Eclipse Public License v1.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * which accompanies this distribution, and is available at<a name="line.6"></a>
<span class="sourceLineNo">007</span> * http://www.eclipse.org/legal/epl-v10.html<a name="line.7"></a>
<span class="sourceLineNo">008</span> */<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>package org.eclipse.january.dataset;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.eclipse.january.DatasetException;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>/**<a name="line.14"></a>
<span class="sourceLineNo">015</span> * A running mean class<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>public class RunningAverage {<a name="line.17"></a>
<span class="sourceLineNo">018</span> <a name="line.18"></a>
<span class="sourceLineNo">019</span> private DoubleDataset average;<a name="line.19"></a>
<span class="sourceLineNo">020</span> private DoubleDataset sqAveError;<a name="line.20"></a>
<span class="sourceLineNo">021</span> private int count = 1;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span> /**<a name="line.23"></a>
<span class="sourceLineNo">024</span> * @param dataset<a name="line.24"></a>
<span class="sourceLineNo">025</span> */<a name="line.25"></a>
<span class="sourceLineNo">026</span> public RunningAverage(IDataset dataset) {<a name="line.26"></a>
<span class="sourceLineNo">027</span> average = (DoubleDataset) (dataset.getElementClass().equals(Double.class) ? DatasetUtils.convertToDataset(dataset).clone()<a name="line.27"></a>
<span class="sourceLineNo">028</span> : DatasetUtils.cast(dataset, Dataset.FLOAT64));<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span> sqAveError = null;<a name="line.30"></a>
<span class="sourceLineNo">031</span> Dataset eb = average.getErrorBuffer();<a name="line.31"></a>
<span class="sourceLineNo">032</span> if (eb != null) {<a name="line.32"></a>
<span class="sourceLineNo">033</span> sqAveError = eb.getDType() != Dataset.FLOAT64 ? (DoubleDataset) DatasetUtils.cast(eb, Dataset.FLOAT64) :<a name="line.33"></a>
<span class="sourceLineNo">034</span> (DoubleDataset) eb;<a name="line.34"></a>
<span class="sourceLineNo">035</span> }<a name="line.35"></a>
<span class="sourceLineNo">036</span> }<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span> /**<a name="line.38"></a>
<span class="sourceLineNo">039</span> * Update average<a name="line.39"></a>
<span class="sourceLineNo">040</span> * @param dataset<a name="line.40"></a>
<span class="sourceLineNo">041</span> */<a name="line.41"></a>
<span class="sourceLineNo">042</span> public void update(IDataset dataset) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> count++;<a name="line.43"></a>
<span class="sourceLineNo">044</span> IndexIterator it = average.getIterator(true);<a name="line.44"></a>
<span class="sourceLineNo">045</span> int[] pos = it.getPos();<a name="line.45"></a>
<span class="sourceLineNo">046</span> double f = 1. / count;<a name="line.46"></a>
<span class="sourceLineNo">047</span> if (sqAveError == null) {<a name="line.47"></a>
<span class="sourceLineNo">048</span> while (it.hasNext()) {<a name="line.48"></a>
<span class="sourceLineNo">049</span> double m = average.getAbs(it.index);<a name="line.49"></a>
<span class="sourceLineNo">050</span> double v = f * (dataset.getDouble(pos) - m);<a name="line.50"></a>
<span class="sourceLineNo">051</span> average.setAbs(it.index, m + v);<a name="line.51"></a>
<span class="sourceLineNo">052</span> }<a name="line.52"></a>
<span class="sourceLineNo">053</span> } else {<a name="line.53"></a>
<span class="sourceLineNo">054</span> double fs = f * f;<a name="line.54"></a>
<span class="sourceLineNo">055</span> double gs = 2 * count - 1;<a name="line.55"></a>
<span class="sourceLineNo">056</span> if (dataset instanceof Dataset) {<a name="line.56"></a>
<span class="sourceLineNo">057</span> final Dataset d = (Dataset) dataset;<a name="line.57"></a>
<span class="sourceLineNo">058</span> final Dataset e = d.getErrorBuffer();<a name="line.58"></a>
<span class="sourceLineNo">059</span> while (it.hasNext()) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> double m = average.getAbs(it.index);<a name="line.60"></a>
<span class="sourceLineNo">061</span> double v = f * (d.getDouble(pos) - m);<a name="line.61"></a>
<span class="sourceLineNo">062</span> average.setAbs(it.index, m + v);<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span> if (e != null) {<a name="line.64"></a>
<span class="sourceLineNo">065</span> m = sqAveError.getDouble(pos);<a name="line.65"></a>
<span class="sourceLineNo">066</span> v = fs * (e.getDouble(pos) - gs * m);<a name="line.66"></a>
<span class="sourceLineNo">067</span> sqAveError.setItem(m + v, pos);<a name="line.67"></a>
<span class="sourceLineNo">068</span> }<a name="line.68"></a>
<span class="sourceLineNo">069</span> }<a name="line.69"></a>
<span class="sourceLineNo">070</span> } else { // only linear error available<a name="line.70"></a>
<span class="sourceLineNo">071</span> ILazyDataset le = dataset.getErrors();<a name="line.71"></a>
<span class="sourceLineNo">072</span> IDataset e = null;<a name="line.72"></a>
<span class="sourceLineNo">073</span> if (le instanceof IDataset) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> e = (IDataset) le;<a name="line.74"></a>
<span class="sourceLineNo">075</span> } else if (le != null) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> try {<a name="line.76"></a>
<span class="sourceLineNo">077</span> e = le.getSlice();<a name="line.77"></a>
<span class="sourceLineNo">078</span> } catch (DatasetException e1) {<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span> }<a name="line.80"></a>
<span class="sourceLineNo">081</span> while (it.hasNext()) {<a name="line.81"></a>
<span class="sourceLineNo">082</span> double m = average.getAbs(it.index);<a name="line.82"></a>
<span class="sourceLineNo">083</span> double v = f * (dataset.getDouble(pos) - m);<a name="line.83"></a>
<span class="sourceLineNo">084</span> average.setAbs(it.index, m + v);<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span> if (e != null) {<a name="line.86"></a>
<span class="sourceLineNo">087</span> m = sqAveError.getDouble(pos);<a name="line.87"></a>
<span class="sourceLineNo">088</span> v = e.getDouble(pos);<a name="line.88"></a>
<span class="sourceLineNo">089</span> v = fs * (v * v - gs * m);<a name="line.89"></a>
<span class="sourceLineNo">090</span> sqAveError.setItem(m + v, pos);<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span> }<a name="line.92"></a>
<span class="sourceLineNo">093</span> }<a name="line.93"></a>
<span class="sourceLineNo">094</span> }<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span> /**<a name="line.97"></a>
<span class="sourceLineNo">098</span> * @return count<a name="line.98"></a>
<span class="sourceLineNo">099</span> */<a name="line.99"></a>
<span class="sourceLineNo">100</span> public int getCount() {<a name="line.100"></a>
<span class="sourceLineNo">101</span> return count;<a name="line.101"></a>
<span class="sourceLineNo">102</span> }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span> /**<a name="line.104"></a>
<span class="sourceLineNo">105</span> * @return current average<a name="line.105"></a>
<span class="sourceLineNo">106</span> */<a name="line.106"></a>
<span class="sourceLineNo">107</span> public Dataset getCurrentAverage() {<a name="line.107"></a>
<span class="sourceLineNo">108</span> if (sqAveError != null) {<a name="line.108"></a>
<span class="sourceLineNo">109</span> Dataset e = sqAveError.clone();<a name="line.109"></a>
<span class="sourceLineNo">110</span> DatasetUtils.makeFinite(e);<a name="line.110"></a>
<span class="sourceLineNo">111</span> average.setErrorBuffer(e);<a name="line.111"></a>
<span class="sourceLineNo">112</span> }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span> return average;<a name="line.114"></a>
<span class="sourceLineNo">115</span> }<a name="line.115"></a>
<span class="sourceLineNo">116</span>}<a name="line.116"></a>
</pre>
</div>
</body>
</html>