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Re: IDL function randperm? [message #36158 is a reply to message #36157]

Wed, 20 August 2003 06:52

rigby
Messages: 16
Registered: September 1995

Junior Member

This is what I use to randomly reorder an array, stripped down to its
essentials.I stole the idea from the old RSI newsletter many years
ago.

FUNCTION Randomize, list, seed
; LIST is the array to be randomized
; SEED is the random number generator seed

n = n_elements(list)
return, list[sort(randomu(seed,n))]

end ;; Randomize

IDL> seed = 1
IDL> print, Randomize( indgen(5), seed)
1 0 3 2 4

Note that randomu(), and thus Randomize(), returns SEED as a
36-element long array, tho' you can initialize it with a scalar.

--Wayne

Amara.Graps@ifsi.rm.cnr.it (Amara Graps) wrote in message news:<Amara.Graps-2008031259130001@amaramac.ifsi.rm.cnr.it>...

> I wonder if any of you have an IDL function that gives a
> random permutation of an array index, or know of a
> straightforward way to compute it?

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[Message index]

		Re: IDL function randperm? By: meron on Wed, 20 August 2003 21:00
		Re: IDL function randperm? By: robert.dimeo on Wed, 20 August 2003 07:43
		Re: IDL function randperm? By: robert.dimeo on Wed, 20 August 2003 07:40
		Re: IDL function randperm? By: rigby on Wed, 20 August 2003 06:52
		Re: IDL function randperm? By: Amara.Graps on Wed, 20 August 2003 06:50
		Re: IDL function randperm? By: K. Bowman on Wed, 20 August 2003 06:00

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