[Bug fortran/32879] New: Document algorithm used for random generator
burnus at gcc dot gnu dot org
gcc-bugzilla@gcc.gnu.org
Tue Jul 24 15:09:00 GMT 2007
gfortran has:
irand() - g77
rand() - g77
random_number() - Fortran 90
The algorithm used is different.
Expected:
- State something about the used algorithm
- Point rand() users to random_number() as this algorithm is seemingly better.
(or make at least clear(er) that the algorithms are different)
Cf. http://gcc.gnu.org/ml/fortran/2007-07/msg00454.html
> There are two random number generators in gfortran, one is a simple modulo
> generator that is there for compatibility with g77, this is what you get when
> you call RAND().
>
> The other is the RNG that implements the Fortran 90 RANDOM_NUMBER intrinsic.
> [...] George Marsaglia's KISS (Keep It Simple Stupid)
--
Summary: Document algorithm used for random generator
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: documentation
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: burnus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32879
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