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RANDOM_INIT
— Initialize a pseudo-random number generatorRANDOM_NUMBER
.
CALL RANDOM_INIT(REPEATABLE, IMAGE_DISTINCT)
REPEATABLE | Shall be a scalar with a LOGICAL type,
and it is INTENT(IN) . If it is .true. , the seed is set to
a processor-dependent value that is the same each time RANDOM_INIT
is called from the same image. The term “same image” means a single
instance of program execution. The sequence of random numbers is different
for repeated execution of the program. If it is .false. , the seed
is set to a processor-dependent value.
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IMAGE_DISTINCT | Shall be a scalar with a
LOGICAL type, and it is INTENT(IN) . If it is .true. ,
the seed is set to a processor-dependent value that is distinct from th
seed set by a call to RANDOM_INIT in another image. If it is
.false. , the seed is set to a value that does depend which image called
RANDOM_INIT .
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program test_random_seed implicit none real x(3), y(3) call random_init(.true., .true.) call random_number(x) call random_init(.true., .true.) call random_number(y) ! x and y are the same sequence if (any(x /= y)) call abort end program test_random_seed