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| #include<cstdlib>
#include <ctime>
#include<iostream>
#include<math.h>
#include<fstream>
using namespace std;
void funk(double*& K, double*z){
K[0]=0.;
for(int i=1;i<=10;i++){
K[i]=z[i]*1/50000000;
// cout<<K[i]<<endl;
}
for(int i=11;i<21;i++){
K[i]=K[20-i];
// cout<<K[i]<<endl;
}
}
void coefftransmit (double*&T,double*z,double*K,int n){
for(int i=0;i<n;i++){
T[i]=exp(-K[i]*z[i]);
// cout<<T[i]<<endl;
}
}
void f(const double* T,double zmax,int& i,int& k,int& c){
int s=1;
i=1;
k=0;
c=0;
while ((i>0) and (i<zmax)) {
double x = (float) rand()/RAND_MAX;
if(x>T[i]){
s=-1*s;
i=i+s;
if(s<0){k=i;
}
}
else{
i=i+s;
c=c+1;
}
// cout<<" i= "<<i<<endl;
}
}
void Intensite(double*&I,int k,int i,int c,int& r){
//cout<<"i = "<<i<<" k="<<k<<endl;
if(i==0){
// cout<<"k = "<<k<<endl;
I[k]=I[k]+1;
}
}
int main()
{
float x;
srand((unsigned)time(NULL));
int n=20;
int zmax = n;
int N =100000;
double*T=new double[n];
double*I=new double[n];
double*z=new double[n+1];
z[0]=0;
for (int u=1;u<=n;u++){
z[u]=z[u-1]+500;
}
double*K=new double[n+1];
funk(K,z);
double*C=new double[N];
int k;
int i;
int c;
int r;
coefftransmit (T,z,K,n);
for(int j=0;j<N;j++){
// cout<<"j1 "<<j<<endl;
f(T,zmax,i,k,c);
// cout<<"j2 "<<j<<endl;
Intensite(I,k,i,r,c);
// cout<<"j3 "<<j<<endl;
C[j]=c/2;
}
ofstream fichier ("montecarlo2.xls");
for(int l=0;l<=n;l++){
fichier<<z[l]<<"\t \t" <<I[l]/N<<endl;
}
ofstream fichier2 ("transmission.dat");
for(int l=0;l<=N;l++){
fichier2<<C[l]<<endl;
}
} |
