gcc/fortran/doc/gfortran/intrinsic-procedures/randomnumber.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. index:: RANDOM_NUMBER, random number generation
   7
   8 .. _random_number:
   9
  10 RANDOM_NUMBER --- Pseudo-random number
  11 **************************************
  12
  13 .. function:: RANDOM_NUMBER(HARVEST)
  14
  15   Returns a single pseudorandom number or an array of pseudorandom numbers
  16   from the uniform distribution over the range 0 \leq x < 1.
  17
  18   :param HARVEST:
  19     Shall be a scalar or an array of type ``REAL``.
  20
  21   Standard:
  22     Fortran 90 and later
  23
  24   Class:
  25     Subroutine
  26
  27   Syntax:
  28     .. code-block:: fortran
  29
  30       CALL RANDOM_NUMBER(HARVEST)
  31
  32   Example:
  33     .. code-block:: fortran
  34
  35       program test_random_number
  36         REAL :: r(5,5)
  37         CALL RANDOM_NUMBER(r)
  38       end program
  39
  40   See also:
  41     :ref:`RANDOM_SEED`,
  42     :ref:`RANDOM_INIT`