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Re: Random number generators in IDL [message #8122 is a reply to message #8055]

Fri, 07 February 1997 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Michael Lefsky <mal3p@faraday.clas.Virginia.EDU> writes:

> As many of you pointed out, I ignored the need to check
> the seed given to the random number generator. I had
> always assumed that the time variable that is used as the
> default "seed" value changed relatively quickly- it
> doesn't- I run a routine that generates 1000 random numbers
> at once, and I can easily call it twenty times or more
> before the default seed changes.

To create 1000 random numbers at once, don't do it in a loop!
This is not Fortran code we are writing, folks! :-)

Do this:

thousandRandomNumbers = RANDOMU(seed, 1000)

If you want 1000 random numbers between 0 and 100, do this:

thousandRandomNumbers = RANDOMU(seed, 1000) * 100

Cheers!

David

-----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
2642 Bradbury Court, Fort Collins, CO 80521
Phone: 970-221-0438 Fax: 970-221-4762
E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
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[Message index]

		Random number generators in IDL By: mal3p on Wed, 05 February 1997 00:00
		Re: Random number generators in IDL By: davidf on Fri, 07 February 1997 00:00
		Re: Random number generators in IDL By: mal3p on Fri, 07 February 1997 00:00
		Re: Random number generators in IDL By: steinhh on Thu, 06 February 1997 00:00
		Re: random number generator By: willettk on Fri, 02 January 2009 15:32
		Re: random number generator By: mkmvarma on Mon, 05 January 2009 14:32

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