MVector


1   /* @author rich
2    * Created on 07-Jul-2003
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   package org.lsmp.djep.vectorJep.values;
9   
10  import org.lsmp.djep.vectorJep.*;
11  
12  /**
13   * A Vector of elements.
14   * @author Rich Morris
15   * Created on 07-Jul-2003
16   * @version 1.3.0.2 now extends number
17   */
18  
19  public class MVector extends Number   implements MatrixValueI
20  {
21      private Object   data[] = null;
22      private Dimensions dim;
23      //DoubleMatrix jsciMat;
24      
25      private MVector() {}
26      /** constructs a vector of a given size. **/
27      public MVector(int size)
28      {
29          data = new Object  [size];
30          dim = Dimensions.valueOf(size);
31      }
32      
33      /**
34       * Construct a Vector from a set of elements.
35       * @param vecs
36       */
37  /*
38      public MVector(Object[] eles) throws ParseException
39      {
40          if(eles==null) { throw new ParseException("Tried to create an MVector with null elements"); } 
41          size = eles.length;
42          if(size==0) {  throw new ParseException("Tried to create an Mvector with zero elements"); }     
43          
44          // now check that each vector has the same size.
45          
46          data = eles;
47      }
48  */
49      public String   toString()
50      {
51          StringBuffer   sb = new StringBuffer  ();
52          sb.append('[');
53          for(int i = 0;i<data.length;++i)
54          {
55                  if(i>0) sb.append(',');
56                  sb.append(data[i]);
57          }
58          sb.append(']');
59          return sb.toString();
60      }
61  
62      public Dimensions getDim() { return dim; }  
63      public int getNumEles() { return data.length; }
64      public void setEle(int i,Object   value) { data[i] = value; }
65      public Object   getEle(int i) { return data[i];   }
66      /** sets the elements to those of the arguments. */
67      public void setEles(MatrixValueI val)
68      {
69          if(!dim.equals(val.getDim())) return;
70          System.arraycopy(((MVector) val).data,0,data,0,getNumEles());
71      }
72  
73      /** value of constant ele(1). */    
74      public int intValue() {return ((Number  ) data[0]).intValue();    }
75      /** value of constant ele(1). */    
76      public long longValue() {return ((Number  ) data[0]).longValue(); }
77      /** value of constant ele(1). */    
78      public float floatValue() { return ((Number  ) data[0]).floatValue(); }
79      /** value of constant ele(1). */    
80      public double doubleValue() {return ((Number  ) data[0]).doubleValue();   }
81  
82      public boolean equals(Object   obj) {
83          if(!(obj instanceof MVector)) return false;
84          MVector vec = (MVector) obj;
85          if(!vec.getDim().equals(getDim())) return false;
86          for(int i=0;i<data.length;++i)
87                  if(!data[i].equals(vec.data[i])) return false;
88          return true;
89      }
90  
91      /**
92       * Always override hashCode when you override equals.
93       * Efective Java, Joshua Bloch, Sun Press
94       */
95      public int hashCode() {
96          int result = 17;
97          for(int i=0;i<data.length;++i)
98              result = 37*result+ data[i].hashCode();
99          return result;
100     }
101     
102 }
103
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