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Re: Random selection [message #51255 is a reply to message #51254]

Sat, 11 November 2006 05:23

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Julio writes:

> I have a simple question (I guess...).
> I have an array with two columns and a thousand of rows. Each row has a
>
> pair of latitude and longitude.
>
>
> Array=floatarr(2, 1000)
>
>
> -27.3456 -54.6529
> -23.4546 -56.7263
> ... and so on...
>
>
> I need to retrieve only 100 pairs, randomly. How can I do that?

Like this:

indices = Randomu(seed, 100) * 1000
selected = array[*,indices]

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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