rdevdict::exponential - exponential random deviate generator
Generates exponentially distributed random numbers.
Negative values of lambda are allowed and generate a distribution
of negative numbers.
For lambda > 0:
p(x) = lambda exp(-lambda*x), for x >= 0
p(x) = 0, for x < 0
For lambda < 0:
p(x) = 0, for x > 0
p(x) = |lambda| exp ( -|lambda| |x| ), for x <= 0
lambda - rate parameter (default: 1.0)
Hans Ekkehard Plesser
/home/abuild/rpmbuild/BUILD/nest-2.20.git/librandom/exp_randomdev.h