Re: Landau distribution

[Brian Gough <bjg at network-theory dot co dot uk>]

Gerard Jungman writes:
 > Up to a point. People still expect some uniformity
 > of behaviour. You don't want the thing to just drop out,
 > especially if it is going to drop below standard
 > single-precision accuracy. People are probably not
 > expecting that when they are writing application
 > code, so mistakes could be made.

I agree on the accuracy point in general. In this case I had looked at
the code and it seems like the approximation is good enough for
practical purposes, ---

http://pcitasd28.cern.ch:8042/cgi-bin/cvsweb.cgi/CLHEP/Random/?cvsroot=CLHEP

Random/RandLandau has the source  (originally RANLAN in cernlib I think).

Looks like the approximation in the end regions could be improved with
a few extra terms if necessary.