rndexp

               return a random value on the basis of an exponential
               distribution with a given average

               timing tools

               rndexp(avg,seed)

               avg  : average of the exponential distribution
               seed : seed value for random number generation via the
                      ran3 generator (set to negative to reinitialize)

               none

               none

               rndexp : random value on the basis of an exponential
                          distribution with the given average

               none

               none

               none

               none

               see code

               rndexp(100,seed)

               Version 1.0, 1998/03/09, Katja Pottschmidt, Joern Wilms,
                                        Sara Benlloch
               Version 2.0, 1998/03/12, Sara (ran3)
                                        (benlloch@astro.uni-tuebingen.de)
           CVS Version 1.1, 2001/03/13, Joern Wilms
               removed @ran3 from top to avoid IDL inclusion problems

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