RAND(FLAG)
returns a pseudo-random number from a uniform distribution between 0 and 1. If FLAG is 0, the next number in the current sequence is returned; if FLAG is 1, the generator is restarted by CALL SRAND(0)
; if FLAG has any other value, it is used as a new seed with SRAND
.
This intrinsic routine is provided for backwards compatibility with GNU Fortran 77. It implements a simple modulo generator as provided by g77
. For new code, one should consider the use of RANDOM_NUMBER as it implements a superior algorithm.
GNU extension
Function
RESULT = RAND(I)
I | Shall be a scalar INTEGER of kind 4. |
The return value is of REAL
type and the default kind.
program test_rand integer,parameter :: seed = 86456 call srand(seed) print *, rand(), rand(), rand(), rand() print *, rand(seed), rand(), rand(), rand() end program test_rand
© Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/RAND.html