ran2

        returns one or more uniform random deviate between 0.0 and 1.0

        timing tools adopted from Numerical Recipes Software

        ran2(idum)

        idum : a long integer used to initialize the random number
               generator. The sequence for subsequent call will be
               save by ran2 function in the idum variable. Set idum
               to any negative value to restart the sequence.

        dim  : the dimension of the result. (default = 1)

        none

        ran2 : uniform random deviate between 0.0 and 1.0

        none

        none

        none

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

        none

        ran2(-23887878)

        Version 1.0, 1998/03/12, Sara Benlloch (IAAT)
                                 (benlloch@astro.uni-tuebingen.de)
        Version 1.1, 2000/11/28, S. Benlloch (IAAT)
                   optional input dim added

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