Random Recipes

a Numerical Recipes generator. This one generates many uniforms at once - or even one at a time, if you require it. It is implemented by two intrinsic Fortran subroutines: This subroutine is used to initialize the random number generator. If it is called without an argument, the subroutine chooses a seed from somewhere in the system. Otherwise, there are three possible inputs, but you can't use all three at once (at least not on this department's system!). They must be accessed in a call random_seed(size=) size The output-only variable is a scalar integer which tells the number of integers, or that the seed uses. call random_seed(put=) put The input variable is an integer vector which uses the seed you choose to initialize the random number generator. They offer a bounty on two of their routines - one is faster, but the other is more cautious in the shuffling algorithms employed. The one I put on the course web page is the fast The equivalent of is ; but to initialize the random number random_seedran_seed generator with a seed of your choice, you must use =seed)seed where is a value you choose to initialize the sequence. The equivalent of is . Although may be a multi- random_numberranharvest dimensional array with , it can only be a one-dimensional array for random.f90MODULE . This is a special kind of programming building block called a .