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9.222 RANDOM_NUMBER — Pseudo-random number

Description:
Returns a single pseudorandom number or an array of pseudorandom numbers from the uniform distribution over the range 0 \leq x < 1.

The runtime-library implements the xorshift1024* random number generator (RNG). This generator has a period of 2^1024 - 1, and when using multiple threads up to 2^512 threads can each generate 2^512 random numbers before any aliasing occurs.

Note that in a multi-threaded program (e.g. using OpenMP directives), each thread will have its own random number state. For details of the seeding procedure, see the documentation for the RANDOM_SEED intrinsic.

Standard:
Fortran 95 and later
Class:
Subroutine
Syntax:
RANDOM_NUMBER(HARVEST)
Arguments:

HARVEST Shall be a scalar or an array of type REAL.

Example:
          program test_random_number
            REAL :: r(5,5)
            CALL RANDOM_NUMBER(r)
          end program

See also:
RANDOM_SEED