ArcSineH


1   /*****************************************************************************
2   
3   JEP - Java Math Expression Parser 2.3.0
4         October 3 2004
5         (c) Copyright 2004, Nathan Funk and Richard Morris
6         See LICENSE.txt for license information.
7   
8   *****************************************************************************/
9   package org.nfunk.jep.function;
10  
11  import java.util.*;
12  import org.nfunk.jep.*;
13  import org.nfunk.jep.type.*;
14  
15  /**
16   * Implements the arcSinH function.
17   * 
18   * @author Nathan Funk
19   * @since 2.3.0 beta 2 - Now returns Double result rather than Complex for Double arguments. 
20   */
21  public class ArcSineH extends PostfixMathCommand
22  {
23      public ArcSineH()
24      {
25          numberOfParameters = 1;
26      }
27  
28      public void run(Stack inStack)
29          throws ParseException
30      {
31          checkStack(inStack);// check the stack
32          Object   param = inStack.pop();
33          inStack.push(asinh(param));//push the result on the inStack
34          return;
35      }
36  
37      public Object   asinh(Object   param)
38          throws ParseException
39      {
40          if (param instanceof Complex)
41          {
42              return ((Complex)param).asinh();
43          }
44          else if (param instanceof Number  )
45          {
46              double val = ((Number  )param).doubleValue();
47              double res = Math.log(val+Math.sqrt(val*val+1));
48              return new Double  (res);
49  //          Complex temp = new Complex(((Number)param).doubleValue(),0.0);
50  //          return temp.asinh();
51          }
52          throw new ParseException("Invalid parameter type");
53      }
54  }
55
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