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Re: RandomDirichlet?

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On Tue, 01 Nov 2011 10:09:32 +0100, Giovanni Azua
<bravegag@hotmail.com> wrote, quoted or indirectly quoted someone who
said :

>But there is no "gamrnd" RandomGamma in Java nor RandomDirichlet. Before I
>spend time writing this, can anyone advice for a low-footprint library
>implementing those functions?


That class of problem I have on my back shelf to investigate some day.
One way to proceed is to look at the source code for the Gaussian
random number generator to see how they warp the output from a linear
random to an arbitrary shape.  Look in src.zip.

I would love to figure this out to create a recipe for arbitrary
distrtibutions for http://mindprod.com/jgloss/peudorandom.html
 
I have a vaguely related little problem in my todo list.  
Canada has 308 members of parliament.  If there were no bias toward
males or females, what could you say to a novice about how far  from
50/50 it could it stray and still be accounted for by random
variation, not bias? Presumably using the 19 times of 20 beloved of
pollsters.


-- 
Roedy Green Canadian Mind Products
http://mindprod.com
It's difficult to be rigorous about whether a machine really knows,
thinks, etc., because we’re hard put to define these things. 
We understand human mental processes only slightly better than
a fish understands swimming. 
~ John McCarthy (born: 1927-09-04 died: 2011-10-23 at age: 84).
Inventor of the term AI (Artificial Intelligence), 
the short-circuit OR operator (|| in Java), 
and LISP (LIst Processing Language) that makes EMACS 
(Extensible MACro System) so addictive.

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RandomDirichlet? Giovanni Azua <bravegag@hotmail.com> - 2011-11-01 10:09 +0100
  Re: RandomDirichlet? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-01 07:50 -0400
    Re: RandomDirichlet? Giovanni Azua <bravegag@hotmail.com> - 2011-11-01 19:50 +0100
  Re: RandomDirichlet? Wojtek <nowhere@a.com> - 2011-11-01 04:54 -0700
  Re: RandomDirichlet? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-01 06:11 -0700
    Re: RandomDirichlet? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-01 06:16 -0700
    Re: RandomDirichlet? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-01 20:23 -0400
      Re: RandomDirichlet? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-02 01:39 -0700
        Re: RandomDirichlet? Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-11-02 08:17 -0400
  Re: RandomDirichlet? Arne Vajhøj <arne@vajhoej.dk> - 2011-11-01 22:09 -0400

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