Re: Random[BinomialDistribution[..]] wrong ?

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg1082] Re: Random[BinomialDistribution[..]] wrong ?*From*: Gennady <stupakov at slac.stanford.edu>*Date*: Sun, 14 May 1995 19:41:26 -0400*Organization*: SLAC

In article <3opku3$7h4 at news0.cybernetics.net> Paul A. Rubin, rubin at msu.edu writes: >In article <3olugl$ql4 at news0.cybernetics.net>, > bzbkowal at ZIB-Berlin.DE (Axel Kowald) wrote: >->I'm using Mathematica 2.2 on a Macintosh and I got a problem generating >binomially >->distributed random numbers. >-> >->I have: >-> >->Needs["Statistics`DiscreteDistributions`"] >->SeedRandom[17] >->Table[Random[BinomialDistribution[10^6,0.01]],{5}] >->Out-> {998486, 998486, 998486, 998486, 998486} >-> >->Not only that the random numbers are all the same, most importantly they >are in a >->completely wrong range. One should get something around 10000 ! >->The problem seems to be 10^6, if I use something smaller, like 10000, >everything works >->fine. Furthermore the problem seems to be in the Random[] function since >->PDF[BinomialDistribution[10^6,0.01],n] works okay (but takes a long >time). >-> >->Any comments, hints, solutions ? > >I pasted your input statements into version 2.2.2 for Windows and got >something different (and a lot more reasonable): > > {9996, 9954, 9854, 10107, 9837} > >If another Mac user can reproduce the problem, then I would suspect it to >be a bug in the Mac kernel. > >Paul I got the same result: Out[3]= {9996, 9954, 9854, 10107, 9837} on my PowerMAC with Mathematica version 2.2.2. Gennady