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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.math.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		double A= -0.5,B=-0.4,C=7, X0=0.3, Y0=0.2;
  13. 		double X0Y0= Math.pow(X0-A, 2) + Math.pow(Y0-B, 2) + C*Math.exp(-(Math.pow(X0+A, 2))-Math.pow(Y0+B, 2));
  14.         double X1Y0= Math.pow(X0+0.1-A, 2) + Math.pow(Y0-B, 2) + C*Math.exp(-(Math.pow(X0+0.1+A, 2))-Math.pow(Y0+B, 2));
  15.         double X0Y1= Math.pow(X0-A, 2) + Math.pow(Y0+0.1-B, 2) + C*Math.exp(-(Math.pow(X0+A, 2))-Math.pow(Y0+0.1+B, 2));
  16.  
  17.         double gx=(X1Y0-X0Y0)/0.1;
  18.         double gy=(X0Y1-X0Y0)/0.1;
  19.  
  20.         double rez=Math.atan2(gy, gx);
  21.         System.out.println(rez);
  22.  
  23. 	}
  24. }
Success #stdin #stdout 0.1s 320320KB
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0.7277904421087558
https://ideone.com/zVY5t9
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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