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view libs/commons-math-2.1/docs/apidocs/src-html/org/apache/commons/math/random/ValueServer.html @ 13:cbf34dd4d7e6
commons-math-2.1 added
| author | dwinter |
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| date | Tue, 04 Jan 2011 10:02:07 +0100 |
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<HTML> <BODY BGCOLOR="white"> <PRE> <FONT color="green">001</FONT> /*<a name="line.1"></a> <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a> <FONT color="green">003</FONT> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a> <FONT color="green">004</FONT> * this work for additional information regarding copyright ownership.<a name="line.4"></a> <FONT color="green">005</FONT> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a> <FONT color="green">006</FONT> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a> <FONT color="green">007</FONT> * the License. You may obtain a copy of the License at<a name="line.7"></a> <FONT color="green">008</FONT> *<a name="line.8"></a> <FONT color="green">009</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a> <FONT color="green">010</FONT> *<a name="line.10"></a> <FONT color="green">011</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a> <FONT color="green">012</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a> <FONT color="green">013</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a> <FONT color="green">014</FONT> * See the License for the specific language governing permissions and<a name="line.14"></a> <FONT color="green">015</FONT> * limitations under the License.<a name="line.15"></a> <FONT color="green">016</FONT> */<a name="line.16"></a> <FONT color="green">017</FONT> <a name="line.17"></a> <FONT color="green">018</FONT> package org.apache.commons.math.random;<a name="line.18"></a> <FONT color="green">019</FONT> import java.io.BufferedReader;<a name="line.19"></a> <FONT color="green">020</FONT> import java.io.IOException;<a name="line.20"></a> <FONT color="green">021</FONT> import java.io.InputStreamReader;<a name="line.21"></a> <FONT color="green">022</FONT> import java.net.MalformedURLException;<a name="line.22"></a> <FONT color="green">023</FONT> import java.net.URL;<a name="line.23"></a> <FONT color="green">024</FONT> <a name="line.24"></a> <FONT color="green">025</FONT> import org.apache.commons.math.MathRuntimeException;<a name="line.25"></a> <FONT color="green">026</FONT> <a name="line.26"></a> <FONT color="green">027</FONT> /**<a name="line.27"></a> <FONT color="green">028</FONT> * Generates values for use in simulation applications.<a name="line.28"></a> <FONT color="green">029</FONT> * <p><a name="line.29"></a> <FONT color="green">030</FONT> * How values are generated is determined by the <code>mode</code><a name="line.30"></a> <FONT color="green">031</FONT> * property.</p><a name="line.31"></a> <FONT color="green">032</FONT> * <p><a name="line.32"></a> <FONT color="green">033</FONT> * Supported <code>mode</code> values are: <ul><a name="line.33"></a> <FONT color="green">034</FONT> * <li> DIGEST_MODE -- uses an empirical distribution </li><a name="line.34"></a> <FONT color="green">035</FONT> * <li> REPLAY_MODE -- replays data from <code>valuesFileURL</code></li><a name="line.35"></a> <FONT color="green">036</FONT> * <li> UNIFORM_MODE -- generates uniformly distributed random values with<a name="line.36"></a> <FONT color="green">037</FONT> * mean = <code>mu</code> </li><a name="line.37"></a> <FONT color="green">038</FONT> * <li> EXPONENTIAL_MODE -- generates exponentially distributed random values<a name="line.38"></a> <FONT color="green">039</FONT> * with mean = <code>mu</code></li><a name="line.39"></a> <FONT color="green">040</FONT> * <li> GAUSSIAN_MODE -- generates Gaussian distributed random values with<a name="line.40"></a> <FONT color="green">041</FONT> * mean = <code>mu</code> and<a name="line.41"></a> <FONT color="green">042</FONT> * standard deviation = <code>sigma</code></li><a name="line.42"></a> <FONT color="green">043</FONT> * <li> CONSTANT_MODE -- returns <code>mu</code> every time.</li></ul></p><a name="line.43"></a> <FONT color="green">044</FONT> *<a name="line.44"></a> <FONT color="green">045</FONT> * @version $Revision: 811827 $ $Date: 2009-09-06 11:32:50 -0400 (Sun, 06 Sep 2009) $<a name="line.45"></a> <FONT color="green">046</FONT> *<a name="line.46"></a> <FONT color="green">047</FONT> */<a name="line.47"></a> <FONT color="green">048</FONT> public class ValueServer {<a name="line.48"></a> <FONT color="green">049</FONT> <a name="line.49"></a> <FONT color="green">050</FONT> /** Use empirical distribution. */<a name="line.50"></a> <FONT color="green">051</FONT> public static final int DIGEST_MODE = 0;<a name="line.51"></a> <FONT color="green">052</FONT> <a name="line.52"></a> <FONT color="green">053</FONT> /** Replay data from valuesFilePath. */<a name="line.53"></a> <FONT color="green">054</FONT> public static final int REPLAY_MODE = 1;<a name="line.54"></a> <FONT color="green">055</FONT> <a name="line.55"></a> <FONT color="green">056</FONT> /** Uniform random deviates with mean = &mu;. */<a name="line.56"></a> <FONT color="green">057</FONT> public static final int UNIFORM_MODE = 2;<a name="line.57"></a> <FONT color="green">058</FONT> <a name="line.58"></a> <FONT color="green">059</FONT> /** Exponential random deviates with mean = &mu;. */<a name="line.59"></a> <FONT color="green">060</FONT> public static final int EXPONENTIAL_MODE = 3;<a name="line.60"></a> <FONT color="green">061</FONT> <a name="line.61"></a> <FONT color="green">062</FONT> /** Gaussian random deviates with mean = &mu;, std dev = &sigma;. */<a name="line.62"></a> <FONT color="green">063</FONT> public static final int GAUSSIAN_MODE = 4;<a name="line.63"></a> <FONT color="green">064</FONT> <a name="line.64"></a> <FONT color="green">065</FONT> /** Always return mu */<a name="line.65"></a> <FONT color="green">066</FONT> public static final int CONSTANT_MODE = 5;<a name="line.66"></a> <FONT color="green">067</FONT> <a name="line.67"></a> <FONT color="green">068</FONT> /** mode determines how values are generated. */<a name="line.68"></a> <FONT color="green">069</FONT> private int mode = 5;<a name="line.69"></a> <FONT color="green">070</FONT> <a name="line.70"></a> <FONT color="green">071</FONT> /** URI to raw data values. */<a name="line.71"></a> <FONT color="green">072</FONT> private URL valuesFileURL = null;<a name="line.72"></a> <FONT color="green">073</FONT> <a name="line.73"></a> <FONT color="green">074</FONT> /** Mean for use with non-data-driven modes. */<a name="line.74"></a> <FONT color="green">075</FONT> private double mu = 0.0;<a name="line.75"></a> <FONT color="green">076</FONT> <a name="line.76"></a> <FONT color="green">077</FONT> /** Standard deviation for use with GAUSSIAN_MODE. */<a name="line.77"></a> <FONT color="green">078</FONT> private double sigma = 0.0;<a name="line.78"></a> <FONT color="green">079</FONT> <a name="line.79"></a> <FONT color="green">080</FONT> /** Empirical probability distribution for use with DIGEST_MODE. */<a name="line.80"></a> <FONT color="green">081</FONT> private EmpiricalDistribution empiricalDistribution = null;<a name="line.81"></a> <FONT color="green">082</FONT> <a name="line.82"></a> <FONT color="green">083</FONT> /** File pointer for REPLAY_MODE. */<a name="line.83"></a> <FONT color="green">084</FONT> private BufferedReader filePointer = null;<a name="line.84"></a> <FONT color="green">085</FONT> <a name="line.85"></a> <FONT color="green">086</FONT> /** RandomDataImpl to use for random data generation. */<a name="line.86"></a> <FONT color="green">087</FONT> private RandomData randomData = new RandomDataImpl();<a name="line.87"></a> <FONT color="green">088</FONT> <a name="line.88"></a> <FONT color="green">089</FONT> // Data generation modes ======================================<a name="line.89"></a> <FONT color="green">090</FONT> <a name="line.90"></a> <FONT color="green">091</FONT> /** Creates new ValueServer */<a name="line.91"></a> <FONT color="green">092</FONT> public ValueServer() {<a name="line.92"></a> <FONT color="green">093</FONT> }<a name="line.93"></a> <FONT color="green">094</FONT> <a name="line.94"></a> <FONT color="green">095</FONT> /**<a name="line.95"></a> <FONT color="green">096</FONT> * Construct a ValueServer instance using a RandomData as its source<a name="line.96"></a> <FONT color="green">097</FONT> * of random data.<a name="line.97"></a> <FONT color="green">098</FONT> *<a name="line.98"></a> <FONT color="green">099</FONT> * @param randomData the RandomData instance used to source random data<a name="line.99"></a> <FONT color="green">100</FONT> * @since 1.1<a name="line.100"></a> <FONT color="green">101</FONT> */<a name="line.101"></a> <FONT color="green">102</FONT> public ValueServer(RandomData randomData) {<a name="line.102"></a> <FONT color="green">103</FONT> this.randomData = randomData;<a name="line.103"></a> <FONT color="green">104</FONT> }<a name="line.104"></a> <FONT color="green">105</FONT> <a name="line.105"></a> <FONT color="green">106</FONT> /**<a name="line.106"></a> <FONT color="green">107</FONT> * Returns the next generated value, generated according<a name="line.107"></a> <FONT color="green">108</FONT> * to the mode value (see MODE constants).<a name="line.108"></a> <FONT color="green">109</FONT> *<a name="line.109"></a> <FONT color="green">110</FONT> * @return generated value<a name="line.110"></a> <FONT color="green">111</FONT> * @throws IOException in REPLAY_MODE if a file I/O error occurs<a name="line.111"></a> <FONT color="green">112</FONT> */<a name="line.112"></a> <FONT color="green">113</FONT> public double getNext() throws IOException {<a name="line.113"></a> <FONT color="green">114</FONT> switch (mode) {<a name="line.114"></a> <FONT color="green">115</FONT> case DIGEST_MODE: return getNextDigest();<a name="line.115"></a> <FONT color="green">116</FONT> case REPLAY_MODE: return getNextReplay();<a name="line.116"></a> <FONT color="green">117</FONT> case UNIFORM_MODE: return getNextUniform();<a name="line.117"></a> <FONT color="green">118</FONT> case EXPONENTIAL_MODE: return getNextExponential();<a name="line.118"></a> <FONT color="green">119</FONT> case GAUSSIAN_MODE: return getNextGaussian();<a name="line.119"></a> <FONT color="green">120</FONT> case CONSTANT_MODE: return mu;<a name="line.120"></a> <FONT color="green">121</FONT> default: throw MathRuntimeException.createIllegalStateException(<a name="line.121"></a> <FONT color="green">122</FONT> "unknown mode {0}, known modes: " +<a name="line.122"></a> <FONT color="green">123</FONT> "{1} ({2}), {3} ({4}), {5} ({6}), {7} ({8}), {9} ({10}) and {11} ({12})",<a name="line.123"></a> <FONT color="green">124</FONT> mode,<a name="line.124"></a> <FONT color="green">125</FONT> "DIGEST_MODE", DIGEST_MODE, "REPLAY_MODE", REPLAY_MODE,<a name="line.125"></a> <FONT color="green">126</FONT> "UNIFORM_MODE", UNIFORM_MODE, "EXPONENTIAL_MODE", EXPONENTIAL_MODE,<a name="line.126"></a> <FONT color="green">127</FONT> "GAUSSIAN_MODE", GAUSSIAN_MODE, "CONSTANT_MODE", CONSTANT_MODE);<a name="line.127"></a> <FONT color="green">128</FONT> }<a name="line.128"></a> <FONT color="green">129</FONT> }<a name="line.129"></a> <FONT color="green">130</FONT> <a name="line.130"></a> <FONT color="green">131</FONT> /**<a name="line.131"></a> <FONT color="green">132</FONT> * Fills the input array with values generated using getNext() repeatedly.<a name="line.132"></a> <FONT color="green">133</FONT> *<a name="line.133"></a> <FONT color="green">134</FONT> * @param values array to be filled<a name="line.134"></a> <FONT color="green">135</FONT> * @throws IOException in REPLAY_MODE if a file I/O error occurs<a name="line.135"></a> <FONT color="green">136</FONT> */<a name="line.136"></a> <FONT color="green">137</FONT> public void fill(double[] values) throws IOException {<a name="line.137"></a> <FONT color="green">138</FONT> for (int i = 0; i < values.length; i++) {<a name="line.138"></a> <FONT color="green">139</FONT> values[i] = getNext();<a name="line.139"></a> <FONT color="green">140</FONT> }<a name="line.140"></a> <FONT color="green">141</FONT> }<a name="line.141"></a> <FONT color="green">142</FONT> <a name="line.142"></a> <FONT color="green">143</FONT> /**<a name="line.143"></a> <FONT color="green">144</FONT> * Returns an array of length <code>length</code> with values generated<a name="line.144"></a> <FONT color="green">145</FONT> * using getNext() repeatedly.<a name="line.145"></a> <FONT color="green">146</FONT> *<a name="line.146"></a> <FONT color="green">147</FONT> * @param length length of output array<a name="line.147"></a> <FONT color="green">148</FONT> * @return array of generated values<a name="line.148"></a> <FONT color="green">149</FONT> * @throws IOException in REPLAY_MODE if a file I/O error occurs<a name="line.149"></a> <FONT color="green">150</FONT> */<a name="line.150"></a> <FONT color="green">151</FONT> public double[] fill(int length) throws IOException {<a name="line.151"></a> <FONT color="green">152</FONT> double[] out = new double[length];<a name="line.152"></a> <FONT color="green">153</FONT> for (int i = 0; i < length; i++) {<a name="line.153"></a> <FONT color="green">154</FONT> out[i] = getNext();<a name="line.154"></a> <FONT color="green">155</FONT> }<a name="line.155"></a> <FONT color="green">156</FONT> return out;<a name="line.156"></a> <FONT color="green">157</FONT> }<a name="line.157"></a> <FONT color="green">158</FONT> <a name="line.158"></a> <FONT color="green">159</FONT> /**<a name="line.159"></a> <FONT color="green">160</FONT> * Computes the empirical distribution using values from the file<a name="line.160"></a> <FONT color="green">161</FONT> * in <code>valuesFileURL</code>, using the default number of bins.<a name="line.161"></a> <FONT color="green">162</FONT> * <p><a name="line.162"></a> <FONT color="green">163</FONT> * <code>valuesFileURL</code> must exist and be<a name="line.163"></a> <FONT color="green">164</FONT> * readable by *this at runtime.</p><a name="line.164"></a> <FONT color="green">165</FONT> * <p><a name="line.165"></a> <FONT color="green">166</FONT> * This method must be called before using <code>getNext()</code><a name="line.166"></a> <FONT color="green">167</FONT> * with <code>mode = DIGEST_MODE</code></p><a name="line.167"></a> <FONT color="green">168</FONT> *<a name="line.168"></a> <FONT color="green">169</FONT> * @throws IOException if an I/O error occurs reading the input file<a name="line.169"></a> <FONT color="green">170</FONT> */<a name="line.170"></a> <FONT color="green">171</FONT> public void computeDistribution() throws IOException {<a name="line.171"></a> <FONT color="green">172</FONT> empiricalDistribution = new EmpiricalDistributionImpl();<a name="line.172"></a> <FONT color="green">173</FONT> empiricalDistribution.load(valuesFileURL);<a name="line.173"></a> <FONT color="green">174</FONT> }<a name="line.174"></a> <FONT color="green">175</FONT> <a name="line.175"></a> <FONT color="green">176</FONT> /**<a name="line.176"></a> <FONT color="green">177</FONT> * Computes the empirical distribution using values from the file<a name="line.177"></a> <FONT color="green">178</FONT> * in <code>valuesFileURL</code> and <code>binCount</code> bins.<a name="line.178"></a> <FONT color="green">179</FONT> * <p><a name="line.179"></a> <FONT color="green">180</FONT> * <code>valuesFileURL</code> must exist and be readable by this process<a name="line.180"></a> <FONT color="green">181</FONT> * at runtime.</p><a name="line.181"></a> <FONT color="green">182</FONT> * <p><a name="line.182"></a> <FONT color="green">183</FONT> * This method must be called before using <code>getNext()</code><a name="line.183"></a> <FONT color="green">184</FONT> * with <code>mode = DIGEST_MODE</code></p><a name="line.184"></a> <FONT color="green">185</FONT> *<a name="line.185"></a> <FONT color="green">186</FONT> * @param binCount the number of bins used in computing the empirical<a name="line.186"></a> <FONT color="green">187</FONT> * distribution<a name="line.187"></a> <FONT color="green">188</FONT> * @throws IOException if an error occurs reading the input file<a name="line.188"></a> <FONT color="green">189</FONT> */<a name="line.189"></a> <FONT color="green">190</FONT> public void computeDistribution(int binCount)<a name="line.190"></a> <FONT color="green">191</FONT> throws IOException {<a name="line.191"></a> <FONT color="green">192</FONT> empiricalDistribution = new EmpiricalDistributionImpl(binCount);<a name="line.192"></a> <FONT color="green">193</FONT> empiricalDistribution.load(valuesFileURL);<a name="line.193"></a> <FONT color="green">194</FONT> mu = empiricalDistribution.getSampleStats().getMean();<a name="line.194"></a> <FONT color="green">195</FONT> sigma = empiricalDistribution.getSampleStats().getStandardDeviation();<a name="line.195"></a> <FONT color="green">196</FONT> }<a name="line.196"></a> <FONT color="green">197</FONT> <a name="line.197"></a> <FONT color="green">198</FONT> /** Getter for property mode.<a name="line.198"></a> <FONT color="green">199</FONT> * @return Value of property mode.<a name="line.199"></a> <FONT color="green">200</FONT> */<a name="line.200"></a> <FONT color="green">201</FONT> public int getMode() {<a name="line.201"></a> <FONT color="green">202</FONT> return mode;<a name="line.202"></a> <FONT color="green">203</FONT> }<a name="line.203"></a> <FONT color="green">204</FONT> <a name="line.204"></a> <FONT color="green">205</FONT> /** Setter for property mode.<a name="line.205"></a> <FONT color="green">206</FONT> * @param mode New value of property mode.<a name="line.206"></a> <FONT color="green">207</FONT> */<a name="line.207"></a> <FONT color="green">208</FONT> public void setMode(int mode) {<a name="line.208"></a> <FONT color="green">209</FONT> this.mode = mode;<a name="line.209"></a> <FONT color="green">210</FONT> }<a name="line.210"></a> <FONT color="green">211</FONT> <a name="line.211"></a> <FONT color="green">212</FONT> /**<a name="line.212"></a> <FONT color="green">213</FONT> * Getter for <code>valuesFileURL<code><a name="line.213"></a> <FONT color="green">214</FONT> * @return Value of property valuesFileURL.<a name="line.214"></a> <FONT color="green">215</FONT> */<a name="line.215"></a> <FONT color="green">216</FONT> public URL getValuesFileURL() {<a name="line.216"></a> <FONT color="green">217</FONT> return valuesFileURL;<a name="line.217"></a> <FONT color="green">218</FONT> }<a name="line.218"></a> <FONT color="green">219</FONT> <a name="line.219"></a> <FONT color="green">220</FONT> /**<a name="line.220"></a> <FONT color="green">221</FONT> * Sets the <code>valuesFileURL</code> using a string URL representation<a name="line.221"></a> <FONT color="green">222</FONT> * @param url String representation for new valuesFileURL.<a name="line.222"></a> <FONT color="green">223</FONT> * @throws MalformedURLException if url is not well formed<a name="line.223"></a> <FONT color="green">224</FONT> */<a name="line.224"></a> <FONT color="green">225</FONT> public void setValuesFileURL(String url) throws MalformedURLException {<a name="line.225"></a> <FONT color="green">226</FONT> this.valuesFileURL = new URL(url);<a name="line.226"></a> <FONT color="green">227</FONT> }<a name="line.227"></a> <FONT color="green">228</FONT> <a name="line.228"></a> <FONT color="green">229</FONT> /**<a name="line.229"></a> <FONT color="green">230</FONT> * Sets the <code>valuesFileURL</code><a name="line.230"></a> <FONT color="green">231</FONT> * @param url New value of property valuesFileURL.<a name="line.231"></a> <FONT color="green">232</FONT> */<a name="line.232"></a> <FONT color="green">233</FONT> public void setValuesFileURL(URL url) {<a name="line.233"></a> <FONT color="green">234</FONT> this.valuesFileURL = url;<a name="line.234"></a> <FONT color="green">235</FONT> }<a name="line.235"></a> <FONT color="green">236</FONT> <a name="line.236"></a> <FONT color="green">237</FONT> /** Getter for property empiricalDistribution.<a name="line.237"></a> <FONT color="green">238</FONT> * @return Value of property empiricalDistribution.<a name="line.238"></a> <FONT color="green">239</FONT> */<a name="line.239"></a> <FONT color="green">240</FONT> public EmpiricalDistribution getEmpiricalDistribution() {<a name="line.240"></a> <FONT color="green">241</FONT> return empiricalDistribution;<a name="line.241"></a> <FONT color="green">242</FONT> }<a name="line.242"></a> <FONT color="green">243</FONT> <a name="line.243"></a> <FONT color="green">244</FONT> /**<a name="line.244"></a> <FONT color="green">245</FONT> * Resets REPLAY_MODE file pointer to the beginning of the <code>valuesFileURL</code>.<a name="line.245"></a> <FONT color="green">246</FONT> *<a name="line.246"></a> <FONT color="green">247</FONT> * @throws IOException if an error occurs opening the file<a name="line.247"></a> <FONT color="green">248</FONT> */<a name="line.248"></a> <FONT color="green">249</FONT> public void resetReplayFile() throws IOException {<a name="line.249"></a> <FONT color="green">250</FONT> if (filePointer != null) {<a name="line.250"></a> <FONT color="green">251</FONT> try {<a name="line.251"></a> <FONT color="green">252</FONT> filePointer.close();<a name="line.252"></a> <FONT color="green">253</FONT> filePointer = null;<a name="line.253"></a> <FONT color="green">254</FONT> } catch (IOException ex) {<a name="line.254"></a> <FONT color="green">255</FONT> // ignore<a name="line.255"></a> <FONT color="green">256</FONT> }<a name="line.256"></a> <FONT color="green">257</FONT> }<a name="line.257"></a> <FONT color="green">258</FONT> filePointer = new BufferedReader(new InputStreamReader(valuesFileURL.openStream()));<a name="line.258"></a> <FONT color="green">259</FONT> }<a name="line.259"></a> <FONT color="green">260</FONT> <a name="line.260"></a> <FONT color="green">261</FONT> /**<a name="line.261"></a> <FONT color="green">262</FONT> * Closes <code>valuesFileURL</code> after use in REPLAY_MODE.<a name="line.262"></a> <FONT color="green">263</FONT> *<a name="line.263"></a> <FONT color="green">264</FONT> * @throws IOException if an error occurs closing the file<a name="line.264"></a> <FONT color="green">265</FONT> */<a name="line.265"></a> <FONT color="green">266</FONT> public void closeReplayFile() throws IOException {<a name="line.266"></a> <FONT color="green">267</FONT> if (filePointer != null) {<a name="line.267"></a> <FONT color="green">268</FONT> filePointer.close();<a name="line.268"></a> <FONT color="green">269</FONT> filePointer = null;<a name="line.269"></a> <FONT color="green">270</FONT> }<a name="line.270"></a> <FONT color="green">271</FONT> }<a name="line.271"></a> <FONT color="green">272</FONT> <a name="line.272"></a> <FONT color="green">273</FONT> /** Getter for property mu.<a name="line.273"></a> <FONT color="green">274</FONT> * @return Value of property mu.<a name="line.274"></a> <FONT color="green">275</FONT> */<a name="line.275"></a> <FONT color="green">276</FONT> public double getMu() {<a name="line.276"></a> <FONT color="green">277</FONT> return mu;<a name="line.277"></a> <FONT color="green">278</FONT> }<a name="line.278"></a> <FONT color="green">279</FONT> <a name="line.279"></a> <FONT color="green">280</FONT> /** Setter for property mu.<a name="line.280"></a> <FONT color="green">281</FONT> * @param mu New value of property mu.<a name="line.281"></a> <FONT color="green">282</FONT> */<a name="line.282"></a> <FONT color="green">283</FONT> public void setMu(double mu) {<a name="line.283"></a> <FONT color="green">284</FONT> this.mu = mu;<a name="line.284"></a> <FONT color="green">285</FONT> }<a name="line.285"></a> <FONT color="green">286</FONT> <a name="line.286"></a> <FONT color="green">287</FONT> /** Getter for property sigma.<a name="line.287"></a> <FONT color="green">288</FONT> * @return Value of property sigma.<a name="line.288"></a> <FONT color="green">289</FONT> */<a name="line.289"></a> <FONT color="green">290</FONT> public double getSigma() {<a name="line.290"></a> <FONT color="green">291</FONT> return sigma;<a name="line.291"></a> <FONT color="green">292</FONT> }<a name="line.292"></a> <FONT color="green">293</FONT> <a name="line.293"></a> <FONT color="green">294</FONT> /** Setter for property sigma.<a name="line.294"></a> <FONT color="green">295</FONT> * @param sigma New value of property sigma.<a name="line.295"></a> <FONT color="green">296</FONT> */<a name="line.296"></a> <FONT color="green">297</FONT> public void setSigma(double sigma) {<a name="line.297"></a> <FONT color="green">298</FONT> this.sigma = sigma;<a name="line.298"></a> <FONT color="green">299</FONT> }<a name="line.299"></a> <FONT color="green">300</FONT> <a name="line.300"></a> <FONT color="green">301</FONT> //------------- private methods ---------------------------------<a name="line.301"></a> <FONT color="green">302</FONT> <a name="line.302"></a> <FONT color="green">303</FONT> /**<a name="line.303"></a> <FONT color="green">304</FONT> * Gets a random value in DIGEST_MODE.<a name="line.304"></a> <FONT color="green">305</FONT> * <p><a name="line.305"></a> <FONT color="green">306</FONT> * <strong>Preconditions</strong>: <ul><a name="line.306"></a> <FONT color="green">307</FONT> * <li>Before this method is called, <code>computeDistribution()</code><a name="line.307"></a> <FONT color="green">308</FONT> * must have completed successfully; otherwise an<a name="line.308"></a> <FONT color="green">309</FONT> * <code>IllegalStateException</code> will be thrown</li></ul></p><a name="line.309"></a> <FONT color="green">310</FONT> *<a name="line.310"></a> <FONT color="green">311</FONT> * @return next random value from the empirical distribution digest<a name="line.311"></a> <FONT color="green">312</FONT> */<a name="line.312"></a> <FONT color="green">313</FONT> private double getNextDigest() {<a name="line.313"></a> <FONT color="green">314</FONT> if ((empiricalDistribution == null) ||<a name="line.314"></a> <FONT color="green">315</FONT> (empiricalDistribution.getBinStats().size() == 0)) {<a name="line.315"></a> <FONT color="green">316</FONT> throw MathRuntimeException.createIllegalStateException("digest not initialized");<a name="line.316"></a> <FONT color="green">317</FONT> }<a name="line.317"></a> <FONT color="green">318</FONT> return empiricalDistribution.getNextValue();<a name="line.318"></a> <FONT color="green">319</FONT> }<a name="line.319"></a> <FONT color="green">320</FONT> <a name="line.320"></a> <FONT color="green">321</FONT> /**<a name="line.321"></a> <FONT color="green">322</FONT> * Gets next sequential value from the <code>valuesFileURL</code>.<a name="line.322"></a> <FONT color="green">323</FONT> * <p><a name="line.323"></a> <FONT color="green">324</FONT> * Throws an IOException if the read fails.</p><a name="line.324"></a> <FONT color="green">325</FONT> * <p><a name="line.325"></a> <FONT color="green">326</FONT> * This method will open the <code>valuesFileURL</code> if there is no<a name="line.326"></a> <FONT color="green">327</FONT> * replay file open.</p><a name="line.327"></a> <FONT color="green">328</FONT> * <p><a name="line.328"></a> <FONT color="green">329</FONT> * The <code>valuesFileURL</code> will be closed and reopened to wrap around<a name="line.329"></a> <FONT color="green">330</FONT> * from EOF to BOF if EOF is encountered. EOFException (which is a kind of<a name="line.330"></a> <FONT color="green">331</FONT> * IOException) may still be thrown if the <code>valuesFileURL</code> is<a name="line.331"></a> <FONT color="green">332</FONT> * empty.</p><a name="line.332"></a> <FONT color="green">333</FONT> *<a name="line.333"></a> <FONT color="green">334</FONT> * @return next value from the replay file<a name="line.334"></a> <FONT color="green">335</FONT> * @throws IOException if there is a problem reading from the file<a name="line.335"></a> <FONT color="green">336</FONT> * @throws NumberFormatException if an invalid numeric string is<a name="line.336"></a> <FONT color="green">337</FONT> * encountered in the file<a name="line.337"></a> <FONT color="green">338</FONT> */<a name="line.338"></a> <FONT color="green">339</FONT> private double getNextReplay() throws IOException {<a name="line.339"></a> <FONT color="green">340</FONT> String str = null;<a name="line.340"></a> <FONT color="green">341</FONT> if (filePointer == null) {<a name="line.341"></a> <FONT color="green">342</FONT> resetReplayFile();<a name="line.342"></a> <FONT color="green">343</FONT> }<a name="line.343"></a> <FONT color="green">344</FONT> if ((str = filePointer.readLine()) == null) {<a name="line.344"></a> <FONT color="green">345</FONT> // we have probably reached end of file, wrap around from EOF to BOF<a name="line.345"></a> <FONT color="green">346</FONT> closeReplayFile();<a name="line.346"></a> <FONT color="green">347</FONT> resetReplayFile();<a name="line.347"></a> <FONT color="green">348</FONT> if ((str = filePointer.readLine()) == null) {<a name="line.348"></a> <FONT color="green">349</FONT> throw MathRuntimeException.createEOFException("URL {0} contains no data",<a name="line.349"></a> <FONT color="green">350</FONT> valuesFileURL);<a name="line.350"></a> <FONT color="green">351</FONT> }<a name="line.351"></a> <FONT color="green">352</FONT> }<a name="line.352"></a> <FONT color="green">353</FONT> return Double.valueOf(str).doubleValue();<a name="line.353"></a> <FONT color="green">354</FONT> }<a name="line.354"></a> <FONT color="green">355</FONT> <a name="line.355"></a> <FONT color="green">356</FONT> /**<a name="line.356"></a> <FONT color="green">357</FONT> * Gets a uniformly distributed random value with mean = mu.<a name="line.357"></a> <FONT color="green">358</FONT> *<a name="line.358"></a> <FONT color="green">359</FONT> * @return random uniform value<a name="line.359"></a> <FONT color="green">360</FONT> */<a name="line.360"></a> <FONT color="green">361</FONT> private double getNextUniform() {<a name="line.361"></a> <FONT color="green">362</FONT> return randomData.nextUniform(0, 2 * mu);<a name="line.362"></a> <FONT color="green">363</FONT> }<a name="line.363"></a> <FONT color="green">364</FONT> <a name="line.364"></a> <FONT color="green">365</FONT> /**<a name="line.365"></a> <FONT color="green">366</FONT> * Gets an exponentially distributed random value with mean = mu.<a name="line.366"></a> <FONT color="green">367</FONT> *<a name="line.367"></a> <FONT color="green">368</FONT> * @return random exponential value<a name="line.368"></a> <FONT color="green">369</FONT> */<a name="line.369"></a> <FONT color="green">370</FONT> private double getNextExponential() {<a name="line.370"></a> <FONT color="green">371</FONT> return randomData.nextExponential(mu);<a name="line.371"></a> <FONT color="green">372</FONT> }<a name="line.372"></a> <FONT color="green">373</FONT> <a name="line.373"></a> <FONT color="green">374</FONT> /**<a name="line.374"></a> <FONT color="green">375</FONT> * Gets a Gaussian distributed random value with mean = mu<a name="line.375"></a> <FONT color="green">376</FONT> * and standard deviation = sigma.<a name="line.376"></a> <FONT color="green">377</FONT> *<a name="line.377"></a> <FONT color="green">378</FONT> * @return random Gaussian value<a name="line.378"></a> <FONT color="green">379</FONT> */<a name="line.379"></a> <FONT color="green">380</FONT> private double getNextGaussian() {<a name="line.380"></a> <FONT color="green">381</FONT> return randomData.nextGaussian(mu, sigma);<a name="line.381"></a> <FONT color="green">382</FONT> }<a name="line.382"></a> <FONT color="green">383</FONT> <a name="line.383"></a> <FONT color="green">384</FONT> }<a name="line.384"></a> </PRE> </BODY> </HTML>