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
