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| <FONT color="green">001</FONT> /*<a name="line.1"></a> |
| <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <FONT color="green">003</FONT> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <FONT color="green">004</FONT> * distributed with this work for additional information<a name="line.4"></a> |
| <FONT color="green">005</FONT> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <FONT color="green">006</FONT> * to you under the Apache License, Version 2.0 (the "License");<a name="line.6"></a> |
| <FONT color="green">007</FONT> * you may not use this file except in compliance with the License.<a name="line.7"></a> |
| <FONT color="green">008</FONT> * You may obtain a copy of the License at<a name="line.8"></a> |
| <FONT color="green">009</FONT> *<a name="line.9"></a> |
| <FONT color="green">010</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <FONT color="green">011</FONT> *<a name="line.11"></a> |
| <FONT color="green">012</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <FONT color="green">013</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <FONT color="green">014</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <FONT color="green">015</FONT> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <FONT color="green">016</FONT> * limitations under the License.<a name="line.16"></a> |
| <FONT color="green">017</FONT> */<a name="line.17"></a> |
| <FONT color="green">018</FONT> /*<a name="line.18"></a> |
| <FONT color="green">019</FONT> * $Id: ExsltMath.java 468639 2006-10-28 06:52:33Z minchau $<a name="line.19"></a> |
| <FONT color="green">020</FONT> */<a name="line.20"></a> |
| <FONT color="green">021</FONT> package org.apache.xalan.lib;<a name="line.21"></a> |
| <FONT color="green">022</FONT> <a name="line.22"></a> |
| <FONT color="green">023</FONT> import org.apache.xpath.NodeSet;<a name="line.23"></a> |
| <FONT color="green">024</FONT> <a name="line.24"></a> |
| <FONT color="green">025</FONT> import org.w3c.dom.Node;<a name="line.25"></a> |
| <FONT color="green">026</FONT> import org.w3c.dom.NodeList;<a name="line.26"></a> |
| <FONT color="green">027</FONT> <a name="line.27"></a> |
| <FONT color="green">028</FONT> /**<a name="line.28"></a> |
| <FONT color="green">029</FONT> * This class contains EXSLT math extension functions.<a name="line.29"></a> |
| <FONT color="green">030</FONT> * It is accessed by specifying a namespace URI as follows:<a name="line.30"></a> |
| <FONT color="green">031</FONT> * <pre><a name="line.31"></a> |
| <FONT color="green">032</FONT> * xmlns:math="http://exslt.org/math"<a name="line.32"></a> |
| <FONT color="green">033</FONT> * </pre><a name="line.33"></a> |
| <FONT color="green">034</FONT> * <a name="line.34"></a> |
| <FONT color="green">035</FONT> * The documentation for each function has been copied from the relevant<a name="line.35"></a> |
| <FONT color="green">036</FONT> * EXSLT Implementer page.<a name="line.36"></a> |
| <FONT color="green">037</FONT> * <a name="line.37"></a> |
| <FONT color="green">038</FONT> * @see <a href="http://www.exslt.org/">EXSLT</a><a name="line.38"></a> |
| <FONT color="green">039</FONT> <a name="line.39"></a> |
| <FONT color="green">040</FONT> * @xsl.usage general<a name="line.40"></a> |
| <FONT color="green">041</FONT> */<a name="line.41"></a> |
| <FONT color="green">042</FONT> public class ExsltMath extends ExsltBase<a name="line.42"></a> |
| <FONT color="green">043</FONT> {<a name="line.43"></a> |
| <FONT color="green">044</FONT> // Constants<a name="line.44"></a> |
| <FONT color="green">045</FONT> private static String PI = "3.1415926535897932384626433832795028841971693993751";<a name="line.45"></a> |
| <FONT color="green">046</FONT> private static String E = "2.71828182845904523536028747135266249775724709369996";<a name="line.46"></a> |
| <FONT color="green">047</FONT> private static String SQRRT2 = "1.41421356237309504880168872420969807856967187537694";<a name="line.47"></a> |
| <FONT color="green">048</FONT> private static String LN2 = "0.69314718055994530941723212145817656807550013436025";<a name="line.48"></a> |
| <FONT color="green">049</FONT> private static String LN10 = "2.302585092994046";<a name="line.49"></a> |
| <FONT color="green">050</FONT> private static String LOG2E = "1.4426950408889633";<a name="line.50"></a> |
| <FONT color="green">051</FONT> private static String SQRT1_2 = "0.7071067811865476";<a name="line.51"></a> |
| <FONT color="green">052</FONT> <a name="line.52"></a> |
| <FONT color="green">053</FONT> /**<a name="line.53"></a> |
| <FONT color="green">054</FONT> * The math:max function returns the maximum value of the nodes passed as the argument. <a name="line.54"></a> |
| <FONT color="green">055</FONT> * The maximum value is defined as follows. The node set passed as an argument is sorted <a name="line.55"></a> |
| <FONT color="green">056</FONT> * in descending order as it would be by xsl:sort with a data type of number. The maximum <a name="line.56"></a> |
| <FONT color="green">057</FONT> * is the result of converting the string value of the first node in this sorted list to <a name="line.57"></a> |
| <FONT color="green">058</FONT> * a number using the number function. <a name="line.58"></a> |
| <FONT color="green">059</FONT> * <p><a name="line.59"></a> |
| <FONT color="green">060</FONT> * If the node set is empty, or if the result of converting the string values of any of the <a name="line.60"></a> |
| <FONT color="green">061</FONT> * nodes to a number is NaN, then NaN is returned.<a name="line.61"></a> |
| <FONT color="green">062</FONT> * <a name="line.62"></a> |
| <FONT color="green">063</FONT> * @param nl The NodeList for the node-set to be evaluated.<a name="line.63"></a> |
| <FONT color="green">064</FONT> * <a name="line.64"></a> |
| <FONT color="green">065</FONT> * @return the maximum value found, NaN if any node cannot be converted to a number.<a name="line.65"></a> |
| <FONT color="green">066</FONT> * <a name="line.66"></a> |
| <FONT color="green">067</FONT> * @see <a href="http://www.exslt.org/">EXSLT</a><a name="line.67"></a> |
| <FONT color="green">068</FONT> */<a name="line.68"></a> |
| <FONT color="green">069</FONT> public static double max (NodeList nl)<a name="line.69"></a> |
| <FONT color="green">070</FONT> {<a name="line.70"></a> |
| <FONT color="green">071</FONT> if (nl == null || nl.getLength() == 0)<a name="line.71"></a> |
| <FONT color="green">072</FONT> return Double.NaN;<a name="line.72"></a> |
| <FONT color="green">073</FONT> <a name="line.73"></a> |
| <FONT color="green">074</FONT> double m = - Double.MAX_VALUE;<a name="line.74"></a> |
| <FONT color="green">075</FONT> for (int i = 0; i < nl.getLength(); i++)<a name="line.75"></a> |
| <FONT color="green">076</FONT> {<a name="line.76"></a> |
| <FONT color="green">077</FONT> Node n = nl.item(i);<a name="line.77"></a> |
| <FONT color="green">078</FONT> double d = toNumber(n);<a name="line.78"></a> |
| <FONT color="green">079</FONT> if (Double.isNaN(d))<a name="line.79"></a> |
| <FONT color="green">080</FONT> return Double.NaN;<a name="line.80"></a> |
| <FONT color="green">081</FONT> else if (d > m)<a name="line.81"></a> |
| <FONT color="green">082</FONT> m = d;<a name="line.82"></a> |
| <FONT color="green">083</FONT> }<a name="line.83"></a> |
| <FONT color="green">084</FONT> <a name="line.84"></a> |
| <FONT color="green">085</FONT> return m; <a name="line.85"></a> |
| <FONT color="green">086</FONT> }<a name="line.86"></a> |
| <FONT color="green">087</FONT> <a name="line.87"></a> |
| <FONT color="green">088</FONT> /**<a name="line.88"></a> |
| <FONT color="green">089</FONT> * The math:min function returns the minimum value of the nodes passed as the argument. <a name="line.89"></a> |
| <FONT color="green">090</FONT> * The minimum value is defined as follows. The node set passed as an argument is sorted <a name="line.90"></a> |
| <FONT color="green">091</FONT> * in ascending order as it would be by xsl:sort with a data type of number. The minimum <a name="line.91"></a> |
| <FONT color="green">092</FONT> * is the result of converting the string value of the first node in this sorted list to <a name="line.92"></a> |
| <FONT color="green">093</FONT> * a number using the number function. <a name="line.93"></a> |
| <FONT color="green">094</FONT> * <p><a name="line.94"></a> |
| <FONT color="green">095</FONT> * If the node set is empty, or if the result of converting the string values of any of <a name="line.95"></a> |
| <FONT color="green">096</FONT> * the nodes to a number is NaN, then NaN is returned.<a name="line.96"></a> |
| <FONT color="green">097</FONT> * <a name="line.97"></a> |
| <FONT color="green">098</FONT> * @param nl The NodeList for the node-set to be evaluated.<a name="line.98"></a> |
| <FONT color="green">099</FONT> * <a name="line.99"></a> |
| <FONT color="green">100</FONT> * @return the minimum value found, NaN if any node cannot be converted to a number.<a name="line.100"></a> |
| <FONT color="green">101</FONT> * <a name="line.101"></a> |
| <FONT color="green">102</FONT> * @see <a href="http://www.exslt.org/">EXSLT</a><a name="line.102"></a> |
| <FONT color="green">103</FONT> */<a name="line.103"></a> |
| <FONT color="green">104</FONT> public static double min (NodeList nl)<a name="line.104"></a> |
| <FONT color="green">105</FONT> {<a name="line.105"></a> |
| <FONT color="green">106</FONT> if (nl == null || nl.getLength() == 0)<a name="line.106"></a> |
| <FONT color="green">107</FONT> return Double.NaN;<a name="line.107"></a> |
| <FONT color="green">108</FONT> <a name="line.108"></a> |
| <FONT color="green">109</FONT> double m = Double.MAX_VALUE;<a name="line.109"></a> |
| <FONT color="green">110</FONT> for (int i = 0; i < nl.getLength(); i++)<a name="line.110"></a> |
| <FONT color="green">111</FONT> {<a name="line.111"></a> |
| <FONT color="green">112</FONT> Node n = nl.item(i);<a name="line.112"></a> |
| <FONT color="green">113</FONT> double d = toNumber(n);<a name="line.113"></a> |
| <FONT color="green">114</FONT> if (Double.isNaN(d))<a name="line.114"></a> |
| <FONT color="green">115</FONT> return Double.NaN;<a name="line.115"></a> |
| <FONT color="green">116</FONT> else if (d < m)<a name="line.116"></a> |
| <FONT color="green">117</FONT> m = d;<a name="line.117"></a> |
| <FONT color="green">118</FONT> }<a name="line.118"></a> |
| <FONT color="green">119</FONT> <a name="line.119"></a> |
| <FONT color="green">120</FONT> return m;<a name="line.120"></a> |
| <FONT color="green">121</FONT> }<a name="line.121"></a> |
| <FONT color="green">122</FONT> <a name="line.122"></a> |
| <FONT color="green">123</FONT> /**<a name="line.123"></a> |
| <FONT color="green">124</FONT> * The math:highest function returns the nodes in the node set whose value is the maximum <a name="line.124"></a> |
| <FONT color="green">125</FONT> * value for the node set. The maximum value for the node set is the same as the value as <a name="line.125"></a> |
| <FONT color="green">126</FONT> * calculated by math:max. A node has this maximum value if the result of converting its <a name="line.126"></a> |
| <FONT color="green">127</FONT> * string value to a number as if by the number function is equal to the maximum value, <a name="line.127"></a> |
| <FONT color="green">128</FONT> * where the equality comparison is defined as a numerical comparison using the = operator.<a name="line.128"></a> |
| <FONT color="green">129</FONT> * <p><a name="line.129"></a> |
| <FONT color="green">130</FONT> * If any of the nodes in the node set has a non-numeric value, the math:max function will <a name="line.130"></a> |
| <FONT color="green">131</FONT> * return NaN. The definition numeric comparisons entails that NaN != NaN. Therefore if any <a name="line.131"></a> |
| <FONT color="green">132</FONT> * of the nodes in the node set has a non-numeric value, math:highest will return an empty <a name="line.132"></a> |
| <FONT color="green">133</FONT> * node set. <a name="line.133"></a> |
| <FONT color="green">134</FONT> * <a name="line.134"></a> |
| <FONT color="green">135</FONT> * @param nl The NodeList for the node-set to be evaluated.<a name="line.135"></a> |
| <FONT color="green">136</FONT> * <a name="line.136"></a> |
| <FONT color="green">137</FONT> * @return node-set with nodes containing the maximum value found, an empty node-set<a name="line.137"></a> |
| <FONT color="green">138</FONT> * if any node cannot be converted to a number.<a name="line.138"></a> |
| <FONT color="green">139</FONT> */<a name="line.139"></a> |
| <FONT color="green">140</FONT> public static NodeList highest (NodeList nl)<a name="line.140"></a> |
| <FONT color="green">141</FONT> { <a name="line.141"></a> |
| <FONT color="green">142</FONT> double maxValue = max(nl);<a name="line.142"></a> |
| <FONT color="green">143</FONT> <a name="line.143"></a> |
| <FONT color="green">144</FONT> NodeSet highNodes = new NodeSet();<a name="line.144"></a> |
| <FONT color="green">145</FONT> highNodes.setShouldCacheNodes(true); <a name="line.145"></a> |
| <FONT color="green">146</FONT> <a name="line.146"></a> |
| <FONT color="green">147</FONT> if (Double.isNaN(maxValue))<a name="line.147"></a> |
| <FONT color="green">148</FONT> return highNodes; // empty Nodeset<a name="line.148"></a> |
| <FONT color="green">149</FONT> <a name="line.149"></a> |
| <FONT color="green">150</FONT> for (int i = 0; i < nl.getLength(); i++)<a name="line.150"></a> |
| <FONT color="green">151</FONT> {<a name="line.151"></a> |
| <FONT color="green">152</FONT> Node n = nl.item(i);<a name="line.152"></a> |
| <FONT color="green">153</FONT> double d = toNumber(n); <a name="line.153"></a> |
| <FONT color="green">154</FONT> if (d == maxValue)<a name="line.154"></a> |
| <FONT color="green">155</FONT> highNodes.addElement(n);<a name="line.155"></a> |
| <FONT color="green">156</FONT> }<a name="line.156"></a> |
| <FONT color="green">157</FONT> return highNodes;<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> /**<a name="line.160"></a> |
| <FONT color="green">161</FONT> * The math:lowest function returns the nodes in the node set whose value is the minimum value <a name="line.161"></a> |
| <FONT color="green">162</FONT> * for the node set. The minimum value for the node set is the same as the value as calculated <a name="line.162"></a> |
| <FONT color="green">163</FONT> * by math:min. A node has this minimum value if the result of converting its string value to <a name="line.163"></a> |
| <FONT color="green">164</FONT> * a number as if by the number function is equal to the minimum value, where the equality <a name="line.164"></a> |
| <FONT color="green">165</FONT> * comparison is defined as a numerical comparison using the = operator.<a name="line.165"></a> |
| <FONT color="green">166</FONT> * <p><a name="line.166"></a> |
| <FONT color="green">167</FONT> * If any of the nodes in the node set has a non-numeric value, the math:min function will return <a name="line.167"></a> |
| <FONT color="green">168</FONT> * NaN. The definition numeric comparisons entails that NaN != NaN. Therefore if any of the nodes <a name="line.168"></a> |
| <FONT color="green">169</FONT> * in the node set has a non-numeric value, math:lowest will return an empty node set.<a name="line.169"></a> |
| <FONT color="green">170</FONT> * <a name="line.170"></a> |
| <FONT color="green">171</FONT> * @param nl The NodeList for the node-set to be evaluated.<a name="line.171"></a> |
| <FONT color="green">172</FONT> * <a name="line.172"></a> |
| <FONT color="green">173</FONT> * @return node-set with nodes containing the minimum value found, an empty node-set<a name="line.173"></a> |
| <FONT color="green">174</FONT> * if any node cannot be converted to a number.<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> public static NodeList lowest (NodeList nl)<a name="line.177"></a> |
| <FONT color="green">178</FONT> {<a name="line.178"></a> |
| <FONT color="green">179</FONT> double minValue = min(nl);<a name="line.179"></a> |
| <FONT color="green">180</FONT> <a name="line.180"></a> |
| <FONT color="green">181</FONT> NodeSet lowNodes = new NodeSet();<a name="line.181"></a> |
| <FONT color="green">182</FONT> lowNodes.setShouldCacheNodes(true);<a name="line.182"></a> |
| <FONT color="green">183</FONT> <a name="line.183"></a> |
| <FONT color="green">184</FONT> if (Double.isNaN(minValue))<a name="line.184"></a> |
| <FONT color="green">185</FONT> return lowNodes; // empty Nodeset<a name="line.185"></a> |
| <FONT color="green">186</FONT> <a name="line.186"></a> |
| <FONT color="green">187</FONT> for (int i = 0; i < nl.getLength(); i++)<a name="line.187"></a> |
| <FONT color="green">188</FONT> {<a name="line.188"></a> |
| <FONT color="green">189</FONT> Node n = nl.item(i);<a name="line.189"></a> |
| <FONT color="green">190</FONT> double d = toNumber(n); <a name="line.190"></a> |
| <FONT color="green">191</FONT> if (d == minValue)<a name="line.191"></a> |
| <FONT color="green">192</FONT> lowNodes.addElement(n);<a name="line.192"></a> |
| <FONT color="green">193</FONT> }<a name="line.193"></a> |
| <FONT color="green">194</FONT> return lowNodes;<a name="line.194"></a> |
| <FONT color="green">195</FONT> }<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> * The math:abs function returns the absolute value of a number.<a name="line.198"></a> |
| <FONT color="green">199</FONT> *<a name="line.199"></a> |
| <FONT color="green">200</FONT> * @param num A number<a name="line.200"></a> |
| <FONT color="green">201</FONT> * @return The absolute value of the number<a name="line.201"></a> |
| <FONT color="green">202</FONT> */<a name="line.202"></a> |
| <FONT color="green">203</FONT> public static double abs(double num)<a name="line.203"></a> |
| <FONT color="green">204</FONT> {<a name="line.204"></a> |
| <FONT color="green">205</FONT> return Math.abs(num);<a name="line.205"></a> |
| <FONT color="green">206</FONT> }<a name="line.206"></a> |
| <FONT color="green">207</FONT> <a name="line.207"></a> |
| <FONT color="green">208</FONT> /**<a name="line.208"></a> |
| <FONT color="green">209</FONT> * The math:acos function returns the arccosine value of a number.<a name="line.209"></a> |
| <FONT color="green">210</FONT> *<a name="line.210"></a> |
| <FONT color="green">211</FONT> * @param num A number<a name="line.211"></a> |
| <FONT color="green">212</FONT> * @return The arccosine value of the number<a name="line.212"></a> |
| <FONT color="green">213</FONT> */<a name="line.213"></a> |
| <FONT color="green">214</FONT> public static double acos(double num)<a name="line.214"></a> |
| <FONT color="green">215</FONT> {<a name="line.215"></a> |
| <FONT color="green">216</FONT> return Math.acos(num);<a name="line.216"></a> |
| <FONT color="green">217</FONT> }<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> * The math:asin function returns the arcsine value of a number. <a name="line.220"></a> |
| <FONT color="green">221</FONT> *<a name="line.221"></a> |
| <FONT color="green">222</FONT> * @param num A number<a name="line.222"></a> |
| <FONT color="green">223</FONT> * @return The arcsine value of the number<a name="line.223"></a> |
| <FONT color="green">224</FONT> */<a name="line.224"></a> |
| <FONT color="green">225</FONT> public static double asin(double num)<a name="line.225"></a> |
| <FONT color="green">226</FONT> {<a name="line.226"></a> |
| <FONT color="green">227</FONT> return Math.asin(num);<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> /**<a name="line.230"></a> |
| <FONT color="green">231</FONT> * The math:atan function returns the arctangent value of a number. <a name="line.231"></a> |
| <FONT color="green">232</FONT> *<a name="line.232"></a> |
| <FONT color="green">233</FONT> * @param num A number<a name="line.233"></a> |
| <FONT color="green">234</FONT> * @return The arctangent value of the number<a name="line.234"></a> |
| <FONT color="green">235</FONT> */<a name="line.235"></a> |
| <FONT color="green">236</FONT> public static double atan(double num)<a name="line.236"></a> |
| <FONT color="green">237</FONT> {<a name="line.237"></a> |
| <FONT color="green">238</FONT> return Math.atan(num);<a name="line.238"></a> |
| <FONT color="green">239</FONT> }<a name="line.239"></a> |
| <FONT color="green">240</FONT> <a name="line.240"></a> |
| <FONT color="green">241</FONT> /**<a name="line.241"></a> |
| <FONT color="green">242</FONT> * The math:atan2 function returns the angle ( in radians ) from the X axis to a point (y,x). <a name="line.242"></a> |
| <FONT color="green">243</FONT> *<a name="line.243"></a> |
| <FONT color="green">244</FONT> * @param num1 The X axis value<a name="line.244"></a> |
| <FONT color="green">245</FONT> * @param num2 The Y axis value<a name="line.245"></a> |
| <FONT color="green">246</FONT> * @return The angle (in radians) from the X axis to a point (y,x)<a name="line.246"></a> |
| <FONT color="green">247</FONT> */<a name="line.247"></a> |
| <FONT color="green">248</FONT> public static double atan2(double num1, double num2)<a name="line.248"></a> |
| <FONT color="green">249</FONT> {<a name="line.249"></a> |
| <FONT color="green">250</FONT> return Math.atan2(num1, num2);<a name="line.250"></a> |
| <FONT color="green">251</FONT> }<a name="line.251"></a> |
| <FONT color="green">252</FONT> <a name="line.252"></a> |
| <FONT color="green">253</FONT> /**<a name="line.253"></a> |
| <FONT color="green">254</FONT> * The math:cos function returns cosine of the passed argument. <a name="line.254"></a> |
| <FONT color="green">255</FONT> *<a name="line.255"></a> |
| <FONT color="green">256</FONT> * @param num A number<a name="line.256"></a> |
| <FONT color="green">257</FONT> * @return The cosine value of the number<a name="line.257"></a> |
| <FONT color="green">258</FONT> */<a name="line.258"></a> |
| <FONT color="green">259</FONT> public static double cos(double num)<a name="line.259"></a> |
| <FONT color="green">260</FONT> {<a name="line.260"></a> |
| <FONT color="green">261</FONT> return Math.cos(num);<a name="line.261"></a> |
| <FONT color="green">262</FONT> }<a name="line.262"></a> |
| <FONT color="green">263</FONT> <a name="line.263"></a> |
| <FONT color="green">264</FONT> /**<a name="line.264"></a> |
| <FONT color="green">265</FONT> * The math:exp function returns e (the base of natural logarithms) raised to a power. <a name="line.265"></a> |
| <FONT color="green">266</FONT> *<a name="line.266"></a> |
| <FONT color="green">267</FONT> * @param num A number<a name="line.267"></a> |
| <FONT color="green">268</FONT> * @return The value of e raised to the given power<a name="line.268"></a> |
| <FONT color="green">269</FONT> */<a name="line.269"></a> |
| <FONT color="green">270</FONT> public static double exp(double num)<a name="line.270"></a> |
| <FONT color="green">271</FONT> {<a name="line.271"></a> |
| <FONT color="green">272</FONT> return Math.exp(num);<a name="line.272"></a> |
| <FONT color="green">273</FONT> }<a name="line.273"></a> |
| <FONT color="green">274</FONT> <a name="line.274"></a> |
| <FONT color="green">275</FONT> /**<a name="line.275"></a> |
| <FONT color="green">276</FONT> * The math:log function returns the natural logarithm of a number. <a name="line.276"></a> |
| <FONT color="green">277</FONT> *<a name="line.277"></a> |
| <FONT color="green">278</FONT> * @param num A number<a name="line.278"></a> |
| <FONT color="green">279</FONT> * @return The natural logarithm of the number<a name="line.279"></a> |
| <FONT color="green">280</FONT> */<a name="line.280"></a> |
| <FONT color="green">281</FONT> public static double log(double num)<a name="line.281"></a> |
| <FONT color="green">282</FONT> {<a name="line.282"></a> |
| <FONT color="green">283</FONT> return Math.log(num);<a name="line.283"></a> |
| <FONT color="green">284</FONT> }<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> * The math:power function returns the value of a base expression taken to a specified power. <a name="line.287"></a> |
| <FONT color="green">288</FONT> *<a name="line.288"></a> |
| <FONT color="green">289</FONT> * @param num1 The base<a name="line.289"></a> |
| <FONT color="green">290</FONT> * @param num2 The power<a name="line.290"></a> |
| <FONT color="green">291</FONT> * @return The value of the base expression taken to the specified power<a name="line.291"></a> |
| <FONT color="green">292</FONT> */<a name="line.292"></a> |
| <FONT color="green">293</FONT> public static double power(double num1, double num2)<a name="line.293"></a> |
| <FONT color="green">294</FONT> {<a name="line.294"></a> |
| <FONT color="green">295</FONT> return Math.pow(num1, num2);<a name="line.295"></a> |
| <FONT color="green">296</FONT> }<a name="line.296"></a> |
| <FONT color="green">297</FONT> <a name="line.297"></a> |
| <FONT color="green">298</FONT> /**<a name="line.298"></a> |
| <FONT color="green">299</FONT> * The math:random function returns a random number from 0 to 1. <a name="line.299"></a> |
| <FONT color="green">300</FONT> *<a name="line.300"></a> |
| <FONT color="green">301</FONT> * @return A random double from 0 to 1<a name="line.301"></a> |
| <FONT color="green">302</FONT> */<a name="line.302"></a> |
| <FONT color="green">303</FONT> public static double random()<a name="line.303"></a> |
| <FONT color="green">304</FONT> {<a name="line.304"></a> |
| <FONT color="green">305</FONT> return Math.random();<a name="line.305"></a> |
| <FONT color="green">306</FONT> }<a name="line.306"></a> |
| <FONT color="green">307</FONT> <a name="line.307"></a> |
| <FONT color="green">308</FONT> /**<a name="line.308"></a> |
| <FONT color="green">309</FONT> * The math:sin function returns the sine of the number. <a name="line.309"></a> |
| <FONT color="green">310</FONT> *<a name="line.310"></a> |
| <FONT color="green">311</FONT> * @param num A number<a name="line.311"></a> |
| <FONT color="green">312</FONT> * @return The sine value of the number<a name="line.312"></a> |
| <FONT color="green">313</FONT> */<a name="line.313"></a> |
| <FONT color="green">314</FONT> public static double sin(double num)<a name="line.314"></a> |
| <FONT color="green">315</FONT> {<a name="line.315"></a> |
| <FONT color="green">316</FONT> return Math.sin(num);<a name="line.316"></a> |
| <FONT color="green">317</FONT> }<a name="line.317"></a> |
| <FONT color="green">318</FONT> <a name="line.318"></a> |
| <FONT color="green">319</FONT> /**<a name="line.319"></a> |
| <FONT color="green">320</FONT> * The math:sqrt function returns the square root of a number. <a name="line.320"></a> |
| <FONT color="green">321</FONT> *<a name="line.321"></a> |
| <FONT color="green">322</FONT> * @param num A number<a name="line.322"></a> |
| <FONT color="green">323</FONT> * @return The square root of the number<a name="line.323"></a> |
| <FONT color="green">324</FONT> */<a name="line.324"></a> |
| <FONT color="green">325</FONT> public static double sqrt(double num)<a name="line.325"></a> |
| <FONT color="green">326</FONT> {<a name="line.326"></a> |
| <FONT color="green">327</FONT> return Math.sqrt(num);<a name="line.327"></a> |
| <FONT color="green">328</FONT> }<a name="line.328"></a> |
| <FONT color="green">329</FONT> <a name="line.329"></a> |
| <FONT color="green">330</FONT> /**<a name="line.330"></a> |
| <FONT color="green">331</FONT> * The math:tan function returns the tangent of the number passed as an argument. <a name="line.331"></a> |
| <FONT color="green">332</FONT> *<a name="line.332"></a> |
| <FONT color="green">333</FONT> * @param num A number<a name="line.333"></a> |
| <FONT color="green">334</FONT> * @return The tangent value of the number<a name="line.334"></a> |
| <FONT color="green">335</FONT> */<a name="line.335"></a> |
| <FONT color="green">336</FONT> public static double tan(double num)<a name="line.336"></a> |
| <FONT color="green">337</FONT> {<a name="line.337"></a> |
| <FONT color="green">338</FONT> return Math.tan(num);<a name="line.338"></a> |
| <FONT color="green">339</FONT> }<a name="line.339"></a> |
| <FONT color="green">340</FONT> <a name="line.340"></a> |
| <FONT color="green">341</FONT> /**<a name="line.341"></a> |
| <FONT color="green">342</FONT> * The math:constant function returns the specified constant to a set precision. <a name="line.342"></a> |
| <FONT color="green">343</FONT> * The possible constants are:<a name="line.343"></a> |
| <FONT color="green">344</FONT> * <pre><a name="line.344"></a> |
| <FONT color="green">345</FONT> * PI<a name="line.345"></a> |
| <FONT color="green">346</FONT> * E<a name="line.346"></a> |
| <FONT color="green">347</FONT> * SQRRT2<a name="line.347"></a> |
| <FONT color="green">348</FONT> * LN2<a name="line.348"></a> |
| <FONT color="green">349</FONT> * LN10<a name="line.349"></a> |
| <FONT color="green">350</FONT> * LOG2E<a name="line.350"></a> |
| <FONT color="green">351</FONT> * SQRT1_2<a name="line.351"></a> |
| <FONT color="green">352</FONT> * </pre><a name="line.352"></a> |
| <FONT color="green">353</FONT> * @param name The name of the constant<a name="line.353"></a> |
| <FONT color="green">354</FONT> * @param precision The precision<a name="line.354"></a> |
| <FONT color="green">355</FONT> * @return The value of the specified constant to the given precision<a name="line.355"></a> |
| <FONT color="green">356</FONT> */<a name="line.356"></a> |
| <FONT color="green">357</FONT> public static double constant(String name, double precision)<a name="line.357"></a> |
| <FONT color="green">358</FONT> {<a name="line.358"></a> |
| <FONT color="green">359</FONT> String value = null;<a name="line.359"></a> |
| <FONT color="green">360</FONT> if (name.equals("PI"))<a name="line.360"></a> |
| <FONT color="green">361</FONT> value = PI;<a name="line.361"></a> |
| <FONT color="green">362</FONT> else if (name.equals("E"))<a name="line.362"></a> |
| <FONT color="green">363</FONT> value = E;<a name="line.363"></a> |
| <FONT color="green">364</FONT> else if (name.equals("SQRRT2"))<a name="line.364"></a> |
| <FONT color="green">365</FONT> value = SQRRT2;<a name="line.365"></a> |
| <FONT color="green">366</FONT> else if (name.equals("LN2"))<a name="line.366"></a> |
| <FONT color="green">367</FONT> value = LN2;<a name="line.367"></a> |
| <FONT color="green">368</FONT> else if (name.equals("LN10"))<a name="line.368"></a> |
| <FONT color="green">369</FONT> value = LN10;<a name="line.369"></a> |
| <FONT color="green">370</FONT> else if (name.equals("LOG2E"))<a name="line.370"></a> |
| <FONT color="green">371</FONT> value = LOG2E;<a name="line.371"></a> |
| <FONT color="green">372</FONT> else if (name.equals("SQRT1_2"))<a name="line.372"></a> |
| <FONT color="green">373</FONT> value = SQRT1_2;<a name="line.373"></a> |
| <FONT color="green">374</FONT> <a name="line.374"></a> |
| <FONT color="green">375</FONT> if (value != null)<a name="line.375"></a> |
| <FONT color="green">376</FONT> {<a name="line.376"></a> |
| <FONT color="green">377</FONT> int bits = new Double(precision).intValue();<a name="line.377"></a> |
| <FONT color="green">378</FONT> <a name="line.378"></a> |
| <FONT color="green">379</FONT> if (bits <= value.length())<a name="line.379"></a> |
| <FONT color="green">380</FONT> value = value.substring(0, bits);<a name="line.380"></a> |
| <FONT color="green">381</FONT> <a name="line.381"></a> |
| <FONT color="green">382</FONT> return new Double(value).doubleValue();<a name="line.382"></a> |
| <FONT color="green">383</FONT> }<a name="line.383"></a> |
| <FONT color="green">384</FONT> else<a name="line.384"></a> |
| <FONT color="green">385</FONT> return Double.NaN;<a name="line.385"></a> |
| <FONT color="green">386</FONT> <a name="line.386"></a> |
| <FONT color="green">387</FONT> }<a name="line.387"></a> |
| <FONT color="green">388</FONT> <a name="line.388"></a> |
| <FONT color="green">389</FONT> }<a name="line.389"></a> |
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