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1
9 package org.nfunk.jep.function;
10
11 import java.lang.Math  ;
12 import java.util.*;
13 import org.nfunk.jep.*;
14 import org.nfunk.jep.type.*;
15
16 public class Power extends PostfixMathCommand
17 {
18 public Power()
19 {
20 numberOfParameters = 2;
21 }
22
23 public void run(Stack inStack)
24 throws ParseException
25 {
26 checkStack(inStack);
28 Object param2 = inStack.pop();
29 Object param1 = inStack.pop();
30
31 inStack.push(power(param1, param2));
32 }
33
34 public Object power(Object param1, Object param2)
35 throws ParseException
36 {
37 if (param1 instanceof Complex) {
38 if (param2 instanceof Complex)
39 return power((Complex)param1, (Complex)param2);
40 else if (param2 instanceof Number )
41 return power((Complex)param1, (Number )param2);
42 }
43 else if (param1 instanceof Number ) {
44 if (param2 instanceof Complex)
45 return power((Number )param1, (Complex)param2);
46 else if (param2 instanceof Number )
47 return power((Number )param1, (Number )param2);
48 }
49
50 throw new ParseException("Invalid parameter type");
51 }
52
53
54 public Object power(Number d1, Number d2)
55 {
56 if (d1.doubleValue()<0 && d2.doubleValue() != d2.intValue())
57 {
58 Complex c = new Complex(d1.doubleValue(), 0.0);
59 return c.power(d2.doubleValue());
60 }
61 else
62 return new Double (Math.pow(d1.doubleValue(),d2.doubleValue()));
63 }
64
65 public Object power(Complex c1, Complex c2)
66 {
67 Complex temp = c1.power(c2);
68
69 if (temp.im()==0)
70 return new Double (temp.re());
71 else
72 return temp;
73 }
74
75 public Object power(Complex c, Number d)
76 {
77 Complex temp = c.power(d.doubleValue());
78
79 if (temp.im()==0)
80 return new Double (temp.re());
81 else
82 return temp;
83 }
84
85 public Object power(Number d, Complex c)
86 {
87 Complex base = new Complex(d.doubleValue(), 0.0);
88 Complex temp = base.power(c);
89
90 if (temp.im()==0)
91 return new Double (temp.re());
92 else
93 return temp;
94 }
95
96 }
97 |
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