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Re: Random selection [message #51248 is a reply to message #51245]

Sat, 11 November 2006 14:09

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jean H. writes:

> What do you mean? that there is another method or that it can not return
> more than once the same index? ... I would be interested in knowning
> another method!!!
>
> IDL> a = (Round(Randomu(seed, 100) * 1000))
> IDL> b=histogram(a)
> IDL> print, where(b ge 2)
> 347 683 900 901 925

Oh, sorry. I guess I misunderstood what you meant.
I don't know if there are other methods. Ken's
certainly does give you unique integers. I guess
my only question is whether this method produces
a "random" selection. In other words, is a selection
that guarantees unique integers a "random" selection?

(I am having deja vu writing this, so it seems likely
we have discussed this in the past. I can't remember
what was decided.)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Random selection By: greg michael on Sun, 12 November 2006 05:07
		Re: Random selection By: Julio[1] on Sun, 12 November 2006 04:57
		Re: Random selection By: Kenneth P. Bowman on Sat, 11 November 2006 20:09
		Re: Random selection By: David Fanning on Sat, 11 November 2006 14:09
		Re: Random selection By: Jean H. on Sat, 11 November 2006 13:25
		Re: Random selection By: David Fanning on Sat, 11 November 2006 13:08
		Re: Random selection By: Jean H. on Sat, 11 November 2006 12:45
		Re: Random selection By: David Fanning on Sat, 11 November 2006 05:30
		Re: Random selection By: greg michael on Sat, 11 November 2006 05:28
		Re: Random selection By: David Fanning on Sat, 11 November 2006 05:23
		Re: Random selection By: JD Smith on Mon, 13 November 2006 10:46

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