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Re: How to find second minimum elements in an array in IDL? [message #64768 is a reply to message #64677]

Wed, 14 January 2009 07:53

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On Jan 14, 8:26 am, Hu <jha...@gmail.com> wrote:
> Supposing that there is an array X=[9,2,3,5,1,6,8,4,7], how can I find
> the first and second minimums (in this array are elements 1 and 2) in
> this vector?
>
> I use this to find the first minimum (element 1):
>
> index = where(X eq min(X))
> minimum_first=X[index]
>
> But, how can i find the elements 2 ?
> thanks

For a general approach for finding the n smallest elements of an array
(using HISTOGRAM and REVERSE_INDICES!), try:

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

Mike
--
www.michaelgalloy.com
Tech-X Corporation
Associate Research Scientist

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[Message index]

		How to find second minimum elements in an array in IDL? By: Hu on Wed, 14 January 2009 07:26
		Re: How to find second minimum elements in an array in IDL? By: Michael Galloy on Thu, 15 January 2009 14:39
		Re: How to find second minimum elements in an array in IDL? By: Conor on Fri, 16 January 2009 07:08
		Re: How to find second minimum elements in an array in IDL? By: Conor on Thu, 15 January 2009 09:36
		Re: How to find second minimum elements in an array in IDL? By: Michael Galloy on Wed, 14 January 2009 07:53
		Re: How to find second minimum elements in an array in IDL? By: Hu on Wed, 14 January 2009 07:45
		Re: How to find second minimum elements in an array in IDL? By: pgrigis on Fri, 16 January 2009 07:48

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