Re: Testing a random integer generator
- To: mathgroup at smc.vnet.net
- Subject: [mg130396] Re: Testing a random integer generator
- From: Peter Pein <petsie at dordos.net>
- Date: Mon, 8 Apr 2013 00:06:36 -0400 (EDT)
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Am 07.04.2013 03:55, schrieb Clif McInnis: > I am trying to test the random integer generator in a program to make sure > that it gives the type of output that I am looking for. I expect it to generate (p<>q)<10 slightly less than 1/8 of the time and (p=q)<10 slightly more than 1/8 of the time, 9<(p<>q)<20 slightly less than 3/8 of the time, and 9<(p=q)<20 slightly more than 3/8 of the time. Regardless of my expectations I would like to see how the numbers actually come out, and to that end was attempting to test the test the code, but I can not get it to generate (print) any numbers. I am sure that I have made an error somewhere in the code, but I can not find it and am not getting any error messages. Thank you for any and all help. > > Clif McInnis > > > Initialization :> ({x = 0, p = 0, q = 0}) > While[x < 100, { > Clear[p, q], > q = RandomInteger[{1, 4}], If[q < 4, > {p = RandomInteger[{10, 20}], > q = RandomInteger[], > If[q == 1, q = p, q = RandomInteger[{10, 20}]]}, {p = RandomInteger[{1, 9}], > q = RandomInteger[], > If[q == 1, q = p, q = RandomInteger[{1, 9}]]}], Print[p], > Print[q]}; x++] > I've got another one that generates the pairs very fast: With[{disttbl = MapAt[TransformedDistribution[{x, x}, x \[Distributed] #] &, DiscreteUniformDistribution /@ Flatten[Table[ Flatten[Table[d, {d, {{1, 9}, {10, 20}}}, {n}], 2 - n], {n, 2}], 1], {{1}, {2}}]}, thedist = MixtureDistribution[{1, 3, 1, 3}, disttbl]]; rndPairs[n_] := Round@RandomVariate[thedist, n]; the "Round" is necessary because TransformedDistribution returns inexact numbers (bug or feature?). Have fun, Peter