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Re: Random selection of pairs [message #51246 is a reply to message #51244]

Sat, 11 November 2006 20:30

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

Kenneth P. Bowman wrote:
> It will be much simpler, and probably much quicker, to read all
> of the pairs and then pick 100 randomly, like this script named
> select_random:
>
> x = findgen(2, 1000) ;create fake lon-lat data
> r = RANDOMU(seed, 1000) ;generate random numbers
> j = (SORT(r))[0:9] ;find indices of 10 smallest numbers

Yes, I think this is the way to do it.

It won't help here with only 1000 elements, but I have a routine to get
the indices of the n smallest (or largest) values in an array. It uses
HISTOGRAM and REVERSE_INDICES instead of the SORT in the line

j = (SORT(r))[0:9]

The article describing it is at:

http://michaelgalloy.com/2006/06/02/finding-the-n-smallest-e lements-in-an-array.html

Mike
--
www.michaelgalloy.com

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[Message index]

		Re: Random selection of pairs By: Julio[1] on Sun, 12 November 2006 04:55
		Re: Random selection of pairs By: Michael Galloy on Sat, 11 November 2006 20:30
		Re: Random selection of pairs By: Kenneth P. Bowman on Sat, 11 November 2006 06:58

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