Hi,
I have written a program that uses the random number generator function from the GNU scientific library.
Every time I execute the program it generates the same random numbers. Is there anyway I can generate different random number every time I execute the program.
Thanks
Vibhuti
You probably need to seed the random number generator with a different seed.
Look up a C++ Reference and learn How To Ask Questions The Smart WayOriginally Posted by Bjarne Stroustrup (2000-10-14)
To go even further, you could provide a way for the user to specify the seed, either as a command line argument, environment variable, or something else. That way, the user can reproduce a result if they want to.
(It also makes debugging less impossible if you have a way to reproduce the seed)
Code://try //{ if (a) do { f( b); } while(1); else do { f(!b); } while(1); //}
Most random number generators work on a seed. In the normal C library random generator, that's srand(). I don't know what it's called in GSL, but google finds this:
http://www.gnu.org/software/gsl/manu...alization.html
--
Mats
Compilers can produce warnings - make the compiler programmers happy: Use them!
Please don't PM me for help - and no, I don't do help over instant messengers.
Thank you!! Changing the seed works
I have the same problem.
But i do not understand how u change the seed
can someone please give me more info on that
im still very new to C. :-)
According to the documentation that matsp linked to, it is by using the gsl_rng_set() function. Have you tried using it? (Or if you are talking about the C standard library's rand() function, it will be srand(), also mentioned by matsp.)
Look up a C++ Reference and learn How To Ask Questions The Smart Way
I did not understand much about the gsl_rng_set() function.
i am using the standard library function.
How do i change the seed for the srand?
could u just show me what code i should use?
Read this article on using rand().
Look up a C++ Reference and learn How To Ask Questions The Smart Way
thank you very much.
