IRAND(FLAG)
returns a pseudo-random number from a uniform distribution between 0 and a system-dependent limit (which is in most cases 2147483647). 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 = IRAND(I)
I | Shall be a scalar INTEGER of kind 4. |
The return value is of INTEGER(kind=4)
type.
program test_irand integer,parameter :: seed = 86456 call srand(seed) print *, irand(), irand(), irand(), irand() print *, irand(seed), irand(), irand(), irand() end program test_irand
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gfortran/IRAND.html