Manual Reference Pages  - random_seed (3fortran)

NAME

RANDOM_SEED(3) - [MATHEMATICS:RANDOM] Initialize a pseudo-random number sequence

SYNOPSIS

call random_seed( [size] [,put] [,get] ) 

         subroutine random_seed( size, put, get )


          integer,intent(out),optional :: size
          integer,intent(in),optional :: put(*)
          integer,intent(out),optional :: get(*)

CHARACTERISTICS

o SIZE a scalar default integer
o PUT a rank-one default integer array
o GET a rank-one default integer array
o the result

DESCRIPTION

RANDOM_SEED(3) restarts or queries the state of the pseudorandom number generator used by random_number.

If random_seed is called without arguments, it is seeded with random data retrieved from the operating system.

OPTIONS

o SIZE : specifies the minimum size of the arrays used with the PUT and GET arguments.
o PUT : the size of the array must be larger than or equal to the number returned by the SIZE argument.
o GET : It is INTENT(OUT) and the size of the array must be larger than or equal to the number returned by the SIZE argument.

EXAMPLES

Sample program: 

        program demo_random_seed
        implicit none
        integer, allocatable :: seed(:)
        integer :: n


           call random_seed(size = n)
           allocate(seed(n))
           call random_seed(get=seed)
           write (*, *) seed


        end program demo_random_seed
Results: 

         -674862499 -1750483360  -183136071  -317862567   682500039
         349459   344020729 -1725483289

STANDARD

Fortran 95

SEE ALSO

RANDOM_NUMBER(3)

fortran-lang intrinsic descriptions

Nemo Release 3.1 random_seed (3fortran) April 28, 2024
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