VectorExample


1   /* @author rich
2    * Created on 26-Feb-2004
3    *
4    * This code is covered by a Creative Commons
5    * Attribution, Non Commercial, Share Alike license
6    * <a HREF="http://creativecommons.org/licenses/by-nc-sa/1.0">License</a>
7    */
8   
9   package org.lsmp.djepExamples;
10  import org.nfunk.jep.*;
11  import org.lsmp.djep.vectorJep.*;
12  /**
13   * Examples using vectors and matricies
14   */
15  public class VectorExample {
16      static VectorJep j;
17      
18      public static void main(String   args[])  {
19          j = new VectorJep();
20          j.addStandardConstants();
21          j.addStandardFunctions();
22          j.addComplex();
23          j.setAllowUndeclared(true);
24          j.setImplicitMul(true);
25          j.setAllowAssignment(true);
26  
27          // parse and evaluate each equation in turn
28          
29          doStuff("[1,2,3]");               // Value: [1.0,2.0,3.0]
30          doStuff("[1,2,3].[4,5,6]");       // Value: 32.0
31          doStuff("[1,2,3]^^[4,5,6]");      // Value: [-3.0,6.0,-3.0]
32          doStuff("[1,2,3]+[4,5,6]");       // Value: [5.0,7.0,9.0]
33          doStuff("[[1,2],[3,4]]");         // Value: [[1.0,2.0],[3.0,4.0]]
34          doStuff("[[1,2],[3,4]]*[1,0]");   // Value: [1.0,3.0]
35          doStuff("[1,0]*[[1,2],[3,4]]");   // Value: [1.0,2.0]
36          doStuff("[[1,2],[3,4]]*[[1,2],[3,4]]");   // Value: [[7.0,10.0],[15.0,22.0]]
37          doStuff("x=[1,2,3]");             // Value: [1.0,2.0,3.0]
38          doStuff("x+x");                   // Value: [2.0,4.0,6.0]
39          doStuff("x.x");                 // Value: 14.0
40          doStuff("x^x");                  // Value: [0.0,0.0,0.0]
41          doStuff("ele(x,2)");              // Value: 2.0
42          doStuff("y=[[1,2],[3,4]]");       // Value: [[1.0,2.0],[3.0,4.0]]
43          doStuff("y * y");                 // Value: [[7.0,10.0],[15.0,22.0]]
44          doStuff("ele(y,[1,2])");          // Value: 2.0
45      }
46  
47      public static void doStuff(String   str)  {
48          try {
49              Node node = j.parse(str);
50              Object   value = j.evaluate(node);
51              System.out.println(str + "\tvalue " + value.toString());
52          }
53          catch(ParseException e) { System.out.println("Parse error "+e.getMessage()); }      
54          catch(Exception   e) { System.out.println("evaluation error "+e.getMessage()); e.printStackTrace(); }     
55      }
56  }
57
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