Thread: Problem generating random numbers

I have a little problem with my generation of random numbers (that follow a standard normal distribution).

In fact I created my little prog which fills me with an array of 10 float by float chosen according to Gauss' law:

Code:

# # include <iostream>
# #include <cmath> # include <cmath>
# #include <cstdio> # include <cstdio>
# #include <cstdlib> # include <cstdlib>
# #include <ctime> # include <ctime>
# #include "gauss.h" # include "gauss.h"
#
# using namespace std; using namespace std;
#
#
# double frand( double a, double b){ FRAND double (double a, double b) (
#
# return ( rand()/( double )RAND_MAX ) * (ba) + a; return (rand () / (double) RAND_MAX) * (ba) + a;
# } )
#
# void RandomGauss( float * y) RandomGauss void (float * y)
# { (
# srand(( unsigned int ) time(NULL)); srand ((unsigned int) time (NULL));
# // methode de Box-Muller / / Box-Muller
# for ( int i=0;i<10;i++){ for (int i = 0; i <10; i + +) (
# y[i] = sqrt(-2*log(frand(0,1)))*cos(2.*3.14*frand(0,1)); y [i] = sqrt (-2 * log (FRAND (0.1))) * cos (2 .* 3.14 * FRAND (0.1));
#
# } )
# } )

And I want to use a hand, the problem is that when I use multiple times "RandomGauss ()" in my hands, it simulates every time the same random distribution ...

For those who will say what needs to srand blabla, it works does not it already appears in my and my gauss.cpp main.cpp

Thank you in advance

srand should be done once primarily.

I thought I had tested the srand unique in the hand, but apparently not, since now it works

Thanx !