ran3_poisson

        returns one or more poisson-distributed random numbers with
        given mean, using the ran3 random number generator.

        timing tools adopted from Random number generator and
        simulatiomn by Istvan Deak, Akademiai Kiado, Budapest 1990,
        here the simple count down poisson generator.

        ran3_poisson(seed,mean)

        seed : a long integer used to initialize the random number
               generator (ran3). Set seed to
               any negative value to start the sequence.
        mean : the mean value(s) to use for creating a random value.
               If mean is a vector the returned value is a vector
               with the same dimension, each entry created with the
               corresponding mean value.
               !!! THE MEAN VALUE SHOULD NOT EXCEED 500 TO AVOID
               !!! NUMERICAL PROBLEMS

        none

        ran3_poisson : one or more random deviates from a poisson
                      distribution  (dimension of the output =
                      dimension of mean)

        none

        none (hopefully)

        none

        set IDUM to any negative value to initialize or
        reinitialize the sequence

        y=ran3_poisson(-23887878,[2.5,7.])

        $Log: ran3_poisson.pro,v $
        Revision 1.2  2004/01/09 10:36:53  goehler
        warning for larger numbers
        Revision 1.1  2003/10/11 19:45:24  goehler
        simple poisson statistic random generator

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