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Seg Fault 11

adrem7 (41)
I have a seg fault on this piece of code and don't know really what from, I am trying to work out how to use/understand valgrind at the moment, but wondered if anyone kind enough/with a little spare time/with a debugger might be able to point the problem out to me... I think there is an issue with the "e" and "Ep" part of the code from line 280, maybe including the if loop on 284?? If this is confirmed as the issue, are there any suggestions of how to solve it?? Thanks for any help in advance, A.

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#include <stdio.h> 
#include <string.h>
#include <math.h>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <time.h>
#include <stdlib.h>
#include <sstream>
#include <gmpxx.h>
using namespace std;
#define PI 3.14159265358979323846

int main()
{

  int a,b,c,d,f,i,j,k,m,n,s,Success,Fails;
  double p,theta,phi,Time,Averagetime,Distance,Length,DotProdForce,
  		 Forcemagnitude,ForceMagnitude[200],Force[200][3],Epsilon[3],
         x[200][3],new_x[200][3],y[200][3],A[200],alpha[200][200],degree,bestalpha[500];
  unsigned long int t;
  
  mpf_t Energy,energy,Power,D,En[500],E[1000000],Ep,e;
  
  mpf_set_default_prec(1024);
  
  mpf_init(Power);
  mpf_init(D);
  mpf_init(Ep);
  mpf_init(e);
  mpf_init(Energy);
  mpf_init(energy);
  
  for(i=0;i<1000000;i++){
   mpf_init(E[i]);
  }
  
  for(i=0;i<500;i++){
    mpf_init(En[i]);
  }
  
  mpf_set_d(e,0.00000000000000000000000000000000000000000000000000000000001);

  clock_t t1,t2;
  t1=clock();

t=1000;

while(t<1001){

n=2;

while(n<3){

  b=1;
  Time=0.0;
  
  while(b<2){

    clock_t t3,t4;
    t3=clock();

    if(n>200){
      cout << n << " is too many points for me :-( \n";
      exit(0);
    }
  
    srand((unsigned)time(0));  
  
    for (i=0;i<n;i++){
      x[i][0]=((rand()*1.0)/(1.0*RAND_MAX)-0.5)*2.0;
      x[i][1]=((rand()*1.0)/(1.0*RAND_MAX)-0.5)*2.0;
      x[i][2]=((rand()*1.0)/(1.0*RAND_MAX)-0.5)*2.0;
    
      Length=sqrt(pow(x[i][0],2)+pow(x[i][1],2)+pow(x[i][2],2));
    
      for (k=0;k<3;k++){
        x[i][k]=x[i][k]/Length;
      }
    }

    for(i=0;i<n;i++){
      for(j=0;j<3;j++){
        cout << "x[" << i << "][" << j << "]=" << x[i][j] << "\n";
      }
    }

    mpf_set(Energy,0);
  
    for(i=0;i<n;i++){
      for(j=i+1;j<n;j++){
        Distance=sqrt(pow(x[i][0]-x[j][0],2)+pow(x[i][1]-x[j][1],2)
		             +pow(x[i][2]-x[j][2],2));
		             
		mpf_set_d(D,Distance);
		       
        mpf_pow_ui(Power,D,t);      
        mpf_ui_div(Power,1.0,Power);
        mpf_add(Energy,Energy,Power);
      
      }
    }
  
    for(i=0;i<n;i++){
      y[i][0]=x[i][0];
      y[i][1]=x[i][1];
      y[i][2]=x[i][2];
    }
  
    m=100;
  
    if (m>100){
      cout << "The m="<< m << " loop is inefficient...lessen m \n";
      exit(0);
    }
  
    a=1;
  
    while(a<m){

      for (i=0;i<n;i++){
        x[i][0]=((rand()*1.0)/(1.0*RAND_MAX)-0.5)*2.0;
        x[i][1]=((rand()*1.0)/(1.0*RAND_MAX)-0.5)*2.0;
        x[i][2]=((rand()*1.0)/(1.0*RAND_MAX)-0.5)*2.0;
        
        Length=sqrt(pow(x[i][0],2)+pow(x[i][1],2)+pow(x[i][2],2));
    
        for (k=0;k<3;k++){
          x[i][k]=x[i][k]/Length;
        }
      }

      mpf_set(energy,0);
  
      for(i=0;i<n;i++){
        for(j=i+1;j<n;j++){
          Distance=sqrt(pow(x[i][0]-x[j][0],2)+pow(x[i][1]-x[j][1],2)
		                +pow(x[i][2]-x[j][2],2));
        
		mpf_set_d(D,Distance);
		       
        mpf_pow_ui(Power,D,t);      
        mpf_ui_div(Power,1.0,Power);
        mpf_add(energy,energy,Power);
        }
      }
    
      if(energy<Energy)
        for(i=0;i<n;i++){
          for(j=0;j<3;j++){
            mpf_set(Energy,energy);
            y[i][j]=x[i][j];
          }
        }
      else
        for(i=0;i<n;i++){
          for(j=0;j<3;j++){
            mpf_set(energy,Energy);
            x[i][j]=y[i][j];
          }
        }
      
      a=a+1;
    }
    
    mpf_set(E[0],Energy);

    a=1;
    s=0;
    f=0;
    Forcemagnitude=1.0;

    if(n>80 && t<11)
      p=0.005;
    else if(n>60 && t<11)
      p=0.01;
    else if(n>40 && t<11)
      p=0.02;
    else if(n>25 && t<11)
      p=0.05;
    else if(n>40 && t>11)
      p=0.002;
    else if(n>30 && t>11)
      p=0.005;
    else if(n>20 && t>11)
      p=0.01;
    else if(n>5 && t>11)
      p=0.025;
    else
      p=0.05;

    while(Forcemagnitude>0.000001 && a<1000001){
  
      for(i=0;i<n;i++){ 
        Force[i][0]=0.0; 
        Force[i][1]=0.0; 
        Force[i][2]=0.0; 
      } 

      for(i=0;i<n;i++){ 
        for(j=0;j<i;j++){
        
          Distance=sqrt(pow(x[i][0]-x[j][0],2)+pow(x[i][1]-x[j][1],2)
                        +pow(x[i][2]-x[j][2],2));
                        
          Force[i][0]=Force[i][0]+((x[i][0]-x[j][0])/(pow((Distance),3))); 
          Force[i][1]=Force[i][1]+((x[i][1]-x[j][1])/(pow((Distance),3))); 
          Force[i][2]=Force[i][2]+((x[i][2]-x[j][2])/(pow((Distance),3))); 
        } 

        for (j=i+1;j<n;j++){ 

          Distance=sqrt(pow(x[i][0]-x[j][0],2)+pow(x[i][1]-x[j][1],2)
                        +pow(x[i][2]-x[j][2],2));
                        
          Force[i][0]=Force[i][0]+((x[i][0]-x[j][0])/(pow((Distance),3))); 
          Force[i][1]=Force[i][1]+((x[i][1]-x[j][1])/(pow((Distance),3))); 
          Force[i][2]=Force[i][2]+((x[i][2]-x[j][2])/(pow((Distance),3)));
        }
      }

      for(i=0;i<n;i++){

        DotProdForce=Force[i][0]*x[i][0]+Force[i][1]*x[i][1]+Force[i][2]*x[i][2];
      
        y[i][0]=x[i][0];
        y[i][1]=x[i][1];
        y[i][2]=x[i][2];
    
        Force[i][0]=Force[i][0]-DotProdForce*y[i][0];
        Force[i][1]=Force[i][1]-DotProdForce*y[i][1];
        Force[i][2]=Force[i][2]-DotProdForce*y[i][2];

        x[i][0] = y[i][0]+p*(Force[i][0]);
        x[i][1] = y[i][1]+p*(Force[i][1]);
        x[i][2] = y[i][2]+p*(Force[i][2]);
      
        Length=sqrt(pow(x[i][0],2)+pow(x[i][1],2)+pow(x[i][2],2));

        for (j=0;j<3;j++){
          x[i][j]=x[i][j]/Length;
        }
      }
    
      mpf_set(energy,0);
  
      for(i=0;i<n;i++){
        for(j=i+1;j<n;j++){
      
          Distance=sqrt(pow(x[i][0]-x[j][0],2)+pow(x[i][1]-x[j][1],2)
                        +pow(x[i][2]-x[j][2],2));
                        
          mpf_set_d(D,Distance);
		       
          mpf_pow_ui(Power,D,t);      
          mpf_ui_div(Power,1.0,Power);
          mpf_add(energy,energy,Power);
        }
      }

      mpf_set(E[a],energy);
      
      for(i=0;i<n;i++){
        ForceMagnitude[i]=pow((pow(Force[i][0],2)+pow(Force[i][1],2)
                              +pow(Force[i][2],2)),0.5);
      }

      if (energy<Energy)
        mpf_set(Energy,energy),s=s+1;
      else
        mpf_set(energy,Energy),f=f+1,p=(9.5*p)/10;

      for(i=0;i<n-1;i++){
        if(ForceMagnitude[i]<ForceMagnitude[i+1])
          ForceMagnitude[i]=ForceMagnitude[i+1];
        else
          ForceMagnitude[i+1]=ForceMagnitude[i];
      }

      mpf_sub(Ep,E[a],E[a-1]);
      mpf_pow_ui(Ep,Ep,2);
      mpf_sqrt(Ep,Ep);
      
      if (Ep<e){
        ForceMagnitude[n]=0.000001;
        cout << "BROKEN \n";
      }
      else
        ForceMagnitude[n]=ForceMagnitude[n];

      Forcemagnitude=ForceMagnitude[n];
 
      a=a+1;
    }

    for(i=0;i<n;i++){
      for(j=i+1;j<n;j++){
        Distance=sqrt(pow(x[i][0]-x[j][0],2)+pow(x[i][1]-x[j][1],2)
                        +pow(x[i][2]-x[j][2],2));
                        
        degree=(180/PI);
                        
        alpha[i][j]=degree*acos((2.0-pow(Distance,2))/2.0);
      }
    }

    for(i=0;i<n-1;i++){
      for(j=i+1;j<n-1;j++){
        if(alpha[i][j]>alpha[i][j+1])
          alpha[i][j]=alpha[i][j+1];
        else
          alpha[i][j+1]=alpha[i][j];
      }
    }
    
    for(i=0;i<n-2;i++){
      if(alpha[i][n]>alpha[i+1][n])
        alpha[i][n]=alpha[i+1][n];
      else
        alpha[i+1][n]=alpha[i][n];
    }

    bestalpha[b]=alpha[n-1][n];
    
    mpf_set(En[b],Energy);
    
    b=b+1;
  
    t4=clock();
    float diff ((float)t4-(float)t3);
    float seconds = diff / CLOCKS_PER_SEC;
  
    Time = Time + seconds;
    
  }

  Averagetime = Time/(b-1);
  
  Success=Success+s;
  Fails=Fails+f;

  t2=clock();
    float diff ((float)t2-(float)t1);
    float seconds = diff / CLOCKS_PER_SEC;
  
  n=n+1;
  }
  
t=t+1;
}
  
  return 0;

}
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