Any one has experience to generate a random number in Fortran? using

random_number(a), ...

What's the details?

Thanks

tang

Check Numerical Recipes in FORTRAN online......

for fortran 90, use: CALL RANDOM_NUMBER(random), then the variable random can be used!

but use

CALL RANDOM_NUMBER

gives a same number at different runs. That is, it is not random if different runs are made.

Using 'seed' may solve the problem? then how?

I am not sure but all random number generators produce the same number if you use the same number for their initialization. If you want to get a number which is more random (for you) initialize the generator with e.g. actual time on your computer.

hope it helps

vladimir

But how to set actual time as the seed? What's the command in Fortran?

Thanks

T

These links might be helpful:

http://rsc.anu.edu.au/~harry/COURSES...TH/node73.html

http://www.fortran.com/fortran/random1.f90

http://www.fortran.com/fortran/random2.f90

http://www.fortran.com/fortran/kiss.f90

http://www.library.cornell.edu/nr/nr_index.cgi

The system random generator is sometimes not as random as you would like it to be. The routines in Numerical Recepies are pretty good.

Regards.

Dear Nashat, etc

Thanks a lot

T