How to obtain different random numbers in the same program

Asked Feb 28 '18 at 11:38

Active Feb 28 '18 at 12:14

Viewed 55 times

I wrote this :

#include <boost/random.hpp>
#include <boost/random/normal_distribution.hpp>

int main()
{
  boost::mt19937 rng(time(0)); 
  boost::normal_distribution<> nd(0.0, 1.0);

  boost::variate_generator<boost::mt19937&, 
                       boost::normal_distribution<> > var_nor(rng, nd);
 double d = var_nor();
 }

d contains the random numbers I want. How should I do if I need more random numbers LIKE THIS ONE in the same program and in the same cicle for example?! Now I am seeding it with the time of the computer. And I am using the boost library.

edited Feb 28 '18 at 12:14

schorsch312

5,373
4
25
51

asked Feb 28 '18 at 11:38

Andrea Angeletti

4

Why do you use boost random library? is valid in C++11, can't you use C++11? – xskxzr Feb 28 '18 at 11:40
1

What do you mean with `numbers LIKE THIS ONE`? What is a cicle? – schorsch312 Feb 28 '18 at 11:45
Are you asking about creating another rand object with the same seed? – UKMonkey Feb 28 '18 at 11:53
@UKMonkey yes , I need more object like d but with different value – Andrea Angeletti Feb 28 '18 at 11:57
@xskxzr I need real number with a gaussian distribution with mean 0 and std 1 – Andrea Angeletti Feb 28 '18 at 11:57
@AndreaAngeletti so do exactly the same as you did there; but use a different seed? – UKMonkey Feb 28 '18 at 11:58
@schorsch312 yes infact I give new values to d at each loop cycle , i need in the same cycle another random number like d but with different value of course – Andrea Angeletti Feb 28 '18 at 11:58
@UKMonkey yeah you are right , which seed I should use ? this is the point , I know just the one with the time that allows me quite good random numbers which does not repeat on time . thanks – Andrea Angeletti Feb 28 '18 at 12:00
@AndreaAngeletti You could just add 1 to the previous seed so that you end up with a different seed; thus different random numbers. – UKMonkey Feb 28 '18 at 12:21
Seed it with the random device, as in the linked question – sehe Feb 28 '18 at 12:53

How to obtain different random numbers in the same program

0 Answers0