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What is your opinion on implementing generators for other
distributions like normal and all the ones listed under statistics
(which calculate densities but don't generate)?

Well, re-implementing the existing RAND and RANDBETWEEN with the new
generator is no brainer.  But I'm not sure if we really need to
provide multiple variants for different random number generators.
What we could do is to specify a run-time option for the algorithm
for the normal RAND and RANDBETWEEN functions rather than providing
multiple variants.  That would be my preference.  We already have
formula engine options in Tools - Options (in the Formula tab page),
so adding another one shouldn't be too difficult.

Not sure I understand. My suggestion is that boost::mt19937 is the
only underlying generator algorithm (generating int's) which is then
transformed to get RAND() and RANDBETWEEN(i,j). Yet both are simple
uniform distributions but the user might need Normal distributed
random variables and then RAND() is of little use. So a function like
RANDNORMAL() which generates N(0,1) (still using boost::mt19937)
random numbers would be a useful addition, wouldn't it?

Cheers, Tino


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