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1.14.1.74 Random number generator

The function ‘rand()‘ produces a sequence of pseudo-random numbers between 0 and 1 using an algorithm from P. L’Ecuyer and S. Cote, "Implementing a random number package with splitting facilities", ACM Transactions on Mathematical Software, 17:98-111 (1991).

      rand(0)     returns a pseudo random number in the interval [0:1]
                  generated from the current value of two internal
                  32-bit seeds.
      rand(-1)    resets both seeds to a standard value.
      rand(x)     for integer 0 < x < 2^31-1 sets both internal seeds
                  to x.
      rand({x,y}) for integer 0 < x,y < 2^31-1 sets seed1 to x and 
                  seed2 to y.


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