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On Sep 6, 2010, at 1:13 PM, tamas barjak wrote:> Hello! > > I need some help. > How I know it to draw the formula of the poisson distribution? > > expr<-expression(P(xi == k) == frac(lambda^k, factorial(k))*e^- > lambda) ---> > not good?plotmath (Do not see factorial as a plotmath "function" Try: expr<-expression(P(xi == k) == frac(lambda^k, k*"!")*e^-lambda)> > on the screen the " k! " not the Poisson Formula, but "factorial(k)" > > Thanx!-- David.