Math problem please help me

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3 total messages Started by Felipe Tue, 16 Dec 2003 04:16

#430

Author: Felipe
Date: Tue, 16 Dec 2003 04:16

71 lines
2538 bytes

hi...im working with jbuilder and i have a problem with Math class.... i write my class but in the teta2 angle send me an NaN i was checking but i cant found the problem... somebody can help me??? is urgent..this is my class


import java.math.*;
import java.util.*;
import java.lang.*;
import java.text.*;

public class Cinversa {

 public Cinversa(String coordx,String coordy) {
   double B;
   double x,y;
   double r;

    double r2, x2, y2, teta1, teta2, L1, L2, t, L12, L22;
    double Beta, Gama, G, fi, fi2, rad1, rad2;
int largo;

 String X3 =coordx;
 String Y3 = coordy;

     x = Double.valueOf(coordx).doubleValue();
     y = Double.valueOf(coordy).doubleValue();


    if (y != 0) {
  L1 = 62.5;
  L2 = 53;
  System.out.println(x);
  System.out.println(y);
  x2 = Math.pow(x,2);
  y2 = Math.pow(y,2);
  r2 = (x2+y2);
  r = Math.sqrt(r2);
  System.out.println(r2);

  G = (r2 + Math.pow(L1,2) - Math.pow(L2,2))/(2*L1*r);
  System.out.println(G);
  Gama = Math.acos(G);
  System.out.println("gama");
  B = y/x;
  System.out.println(B);
  Beta = Math.atan(B);
  System.out.println(Beta);


  fi = (r2 - Math.pow(L1,2) - Math.pow(L2,2))/(2*L1*L2);
  System.out.println(fi);
    System.out.println("fi");
 teta2 = Math.acos(fi);*******here is the problem***********
        System.out.println(teta2);
    System.out.println("teta2");


     if (teta2 > 0) {

       teta1 = (Beta - Gama);
        t = (teta1 *625)/1450;
        System.out.println(teta1);
      }

     if (teta2 < 0) {

       teta1 = (Beta + Gama);
        t = (teta1 *625)/1450;
        System.out.println(teta1);
     }
  }
}
}

Re: Math problem please help me

#431

Author: kc
Date: Tue, 16 Dec 2003 08:17

89 lines
3175 bytes

What values are using.
I used 12.4 and 14.1
and get the following

12.4
14.1
352.57000000000005
0.6177053966874066
gama
1.1370967741935483
0.849461322392921
-0.9604045283018868
fi
2.859246884862765
teta2
-0.05551347883261104
Felipe wrote:

> hi...im working with jbuilder and i have a problem with Math class.... i write my class but in the teta2 angle send me an NaN i was checking but i cant found the problem... somebody can help me??? is urgent..this is my class
> 
> 
> import java.math.*;
> import java.util.*;
> import java.lang.*;
> import java.text.*;
> 
> public class Cinversa {
> 
>  public Cinversa(String coordx,String coordy) {
>    double B;
>    double x,y;
>    double r;
> 
>     double r2, x2, y2, teta1, teta2, L1, L2, t, L12, L22;
>     double Beta, Gama, G, fi, fi2, rad1, rad2;
> int largo;
> 
>  String X3 =coordx;
>  String Y3 = coordy;
> 
>      x = Double.valueOf(coordx).doubleValue();
>      y = Double.valueOf(coordy).doubleValue();
> 
> 
>     if (y != 0) {
>   L1 = 62.5;
>   L2 = 53;
>   System.out.println(x);
>   System.out.println(y);
>   x2 = Math.pow(x,2);
>   y2 = Math.pow(y,2);
>   r2 = (x2+y2);
>   r = Math.sqrt(r2);
>   System.out.println(r2);
> 
>   G = (r2 + Math.pow(L1,2) - Math.pow(L2,2))/(2*L1*r);
>   System.out.println(G);
>   Gama = Math.acos(G);
>   System.out.println("gama");
>   B = y/x;
>   System.out.println(B);
>   Beta = Math.atan(B);
>   System.out.println(Beta);
> 
> 
>   fi = (r2 - Math.pow(L1,2) - Math.pow(L2,2))/(2*L1*L2);
>   System.out.println(fi);
>     System.out.println("fi");
>  teta2 = Math.acos(fi);*******here is the problem***********
>         System.out.println(teta2);
>     System.out.println("teta2");
> 
> 
>      if (teta2 > 0) {
> 
>        teta1 = (Beta - Gama);
>         t = (teta1 *625)/1450;
>         System.out.println(teta1);
>       }
> 
>      if (teta2 < 0) {
> 
>        teta1 = (Beta + Gama);
>         t = (teta1 *625)/1450;
>         System.out.println(teta1);
>      }
>   }
> }
> }

Re: Math problem please help me

#432

Author: Felipe
Date: Tue, 16 Dec 2003 14:21

4 lines
1169 bytes

thank u KC it was the problem.... the range of the values...

its working

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