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Manual Reference Pages  - mtprng_rand64 (3m_random)

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NAME

mtprng_rand64(3f) - [M_random:MERSENNE TWISTER] Obtain the next 64-bit integer in the pseudo-random sequence (LICENSE:CUSTOM OPEN)

CONTENTS

Synopsis
Description
Options
Returns
Example

SYNOPSIS

function mtprng_rand64(state) result(r) type(mtprng_state), intent(inout) :: state integer(INT64) :: r

DESCRIPTION

Obtain the next 64-bit integer in the pseudo-random sequence in the range 0 to 2^32-1. Note that the range is considerably below the value of HUGE(0_int64).

OPTIONS

state	generator state initialized by mtprng_init(3f) or mtprng_init_array(3f)

RETURNS

r	next pseudo-random value in the range 0 to 2^32-1

EXAMPLE

Sample program:

   program demo_mtprng_rand64
   use M_random, only : mtprng_state, mtprng_init, mtprng_rand64
   use, intrinsic :: iso_fortran_env, only : int32, int64
   implicit none
   integer(INT32) :: seed
   type(mtprng_state) :: state
     GET_SEED: block
     integer :: count
     integer :: count_rate
        call system_clock(count, count_rate)
     seed = count
     endblock GET_SEED
     call mtprng_init(seed, state)
     write(*,*) mtprng_rand64(state)
   end program demo_mtprng_rand64

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Nemo Release 3.1

mtprng_rand64 (3m_random)

April 12, 2023

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