baker_map               Baker map
linear_con              Linear congruence map
logistic_map            Logistic map
prbits                  Random Bit generator
prcauchy                Cauchy distribution
prexp                   Exponentail distribution
prnorm                  Generating numbers form Normal distribution
                        here we use Box Muler transform to obtain
                        normal random variable
prunf                   Uniformly Pseudo random number generator
saw_tooth               Saw tooth map
stime                   stime function
