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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)
*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com
*Delivered-to*: l-mathgroup@wolfram.com
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*References*: <kjqjln$37o$1@smc.vnet.net>
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
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