[ns] More Random Variables ?

["Nikolaos Katsarakis Austauschstud. (M. Schweigel)" <katsarak@ifn.et.tu-dresden.de>]

Hello ns-users

I am trying to simulate single user web traffic and I would like to use
another distribution for some random variables than Exponential or
Pareto.

For instance, I would like to use a Weibull and a lognormal
distribution, with given mean value and variance. Has anybody used such
random variables, or does anybody know how to produce them?

For example, in http://www.taygeta.com/random/weibull.xml I have found a
way to create a weibull distribution from the uniform [0,1], but it is
done using parameters a,b. Defining these parameters with a given mean
and variance is a difficult task. (don't know how to invert the given
formulas)

If somebody has already used such ranvars, I would be glad if he could
send me an example.

Thank you very much

Nikos Katsarakis