[Help-gsl] Zipf or Zeta distribution

[Altro]

Hi folks,

I need to generate integer numbers from a discrete Zipf distribution. It 
seems that in the GSL this one is missing. Can I use the continuous 
Pareto distribution instead?

As second (naive) question, I would like to ask if, to use one of the 
discrete distributions (for example the Poisson distribution)
is necessary to use the preprocessing described in
http://www.gnu.org/software/gsl/manual/html_node/General-Discrete-Distributions.html 
.

Regards,

Al. T.