Returns a 64 bit pseudo random integer, harvest
, distributed uniformly over
the odd integers of the 64 bit kind.
(Specification)
Type | Intent | Optional | Attributes | Name | ||
---|---|---|---|---|---|---|
integer(kind=int64), | intent(out) | :: | harvest |
subroutine odd_random_integer( harvest )
!! Version: experimental
!!
!! Returns a 64 bit pseudo random integer, `harvest`, distributed uniformly over
!! the odd integers of the 64 bit kind.
!! ([Specification](../page/specs/stdlib_hash_procedures.html#odd_random_integer-returns-odd-integer))
integer(int64), intent(out) :: harvest
real(dp) :: sample(2)
integer(int32) :: part(2)
call random_number( sample )
part = int( floor( sample * 2_int64**32, int64 ) - 2_int64**31, int32 )
harvest = transfer( part, harvest )
harvest = ishft( harvest, 1 ) + 1_int64
end subroutine odd_random_integer