comp.lang.idl-pvwave archive: archive » Re: Randomize array order

Home » Public Forums » archive » Re: Randomize array order

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Randomize array order [message #55011 is a reply to message #55009]

Thu, 26 July 2007 13:32

Vince Hradil
Messages: 574
Registered: December 1999

Senior Member

On Jul 26, 11:57 am, David Streutker <dstreut...@gmail.com> wrote:
> How about a Knuth shuffle?
>
> (Disclaimer: I'm not a statistician; I just found it on Wikipedia.)
>
> function kunsort, array
> na = n_elements(array)
> random = randomu(seed,na) * (na - array - 1) + array
> for i=0L,na-2 do array[i] = array[random[i]]
> return, array
> end
>
> Added to Vince's code (last column):
>
> 0 100000 0.0619998 0.0780001 0.0320001
> 1 166810 0.125000 0.125000 0.0780001
> 2 278256 0.282000 0.218000 0.141000
> 3 464158 0.547000 0.406000 0.235000
> 4 774263 1.07800 0.657000 0.390000
> 5 1291549 1.93700 1.09400 0.703000
> 6 2154435 3.51500 1.89100 1.20300
> 7 3593812 6.34400 3.11000 1.98400
> 8 5994841 11.5470 5.21800 3.36000
> 9 10000000 20.3750 8.67200 5.60900
>
> Windows XP, dual 2.66 GHz, 3 GB RAM, IDL 6.3

I'm not sure, but I think that will give you "with replacement".

Report message to a moderator

[Message index]

		Re: Randomize array order By: Michael Galloy on Fri, 27 July 2007 15:35
		Re: Randomize array order By: James Kuyper on Fri, 27 July 2007 14:29
		Re: Randomize array order By: Conor on Fri, 27 July 2007 11:09
		Re: Randomize array order By: David Streutker on Fri, 27 July 2007 10:54
		Re: Randomize array order By: Conor on Fri, 27 July 2007 09:44
		Re: Randomize array order By: James Kuyper on Fri, 27 July 2007 09:29
		Re: Randomize array order By: James Kuyper on Fri, 27 July 2007 09:05
		Re: Randomize array order By: David Streutker on Fri, 27 July 2007 07:54
		Re: Randomize array order By: Paolo Grigis on Fri, 27 July 2007 06:59
		Re: Randomize array order By: Allan Whiteford on Fri, 27 July 2007 05:03
		Re: Randomize array order By: Allan Whiteford on Fri, 27 July 2007 02:33
		Re: Randomize array order By: David Streutker on Thu, 26 July 2007 14:27
		Re: Randomize array order By: Vince Hradil on Thu, 26 July 2007 13:32
		Re: Randomize array order By: David Streutker on Thu, 26 July 2007 09:57
		Re: Randomize array order By: Conor on Thu, 26 July 2007 09:22
		Re: Randomize array order By: Allan Whiteford on Thu, 26 July 2007 08:49
		Re: Randomize array order By: Vince Hradil on Thu, 26 July 2007 08:13
		Re: Randomize array order By: Vince Hradil on Thu, 26 July 2007 07:58
		Re: Randomize array order By: Conor on Thu, 26 July 2007 06:40
		Re: Randomize array order By: Allan Whiteford on Thu, 26 July 2007 06:30
		Re: Randomize array order By: Brian Larsen on Thu, 26 July 2007 06:06
		Re: Randomize array order By: Brian Larsen on Thu, 26 July 2007 06:04
		Re: Randomize array order By: mattf on Thu, 26 July 2007 05:50
		Re: Randomize array order By: Conor on Thu, 26 July 2007 05:28
		Re: Randomize array order By: Conor on Thu, 26 July 2007 05:24
		Re: Randomize array order By: Vince Hradil on Wed, 25 July 2007 12:59

Previous Topic:	Re: Routine for Converting DN to Radiance to Temperature
Next Topic:	Re: Socket server in > IDL 6.3

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 02:19:10 PDT 2025

Total time taken to generate the page: 0.56269 seconds