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Re: 2d min [message #74373 is a reply to message #74371]

Wed, 12 January 2011 23:18

rogass
Messages: 200
Registered: April 2008

Senior Member

On 12 Jan., 23:21, Gray <grayliketheco...@gmail.com> wrote:
> Hi all,
>
> I have a 3d array, NxNxM. What I would like is to find the minimum of
> each NxN slice, and note the index of the minimum in the slice. I can
> find my minimum by doing min(min(array,ind1,dim=1),dim=1,ind2), but
> I'm not sure how to turn those two index arrays into the indices that
> I need. Help...?
>
> Thanks!
>
> --Gray

Hi,
maybe I missed something, but why don't you use something like this:

IDL> a=randomn(seed,10,10,5)
IDL> min=min(a,dimension=3,ind)
IDL> help,min,ind
MIN FLOAT = Array[10, 10]
IND LONG64 = Array[10, 10]
IDL> ind2=array_indices(size(a,/dimensions),ind,/dimensions)
IDL> help,ind2
IND2 LONG64 = Array[3, 100]

Is array_indices really to slow with the dimension keyword?

Cheers

CR

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[Message index]

		Re: 2d min By: Gray on Thu, 13 January 2011 09:07
		Re: 2d min By: rogass on Thu, 13 January 2011 05:57
		Re: 2d min By: Gray on Thu, 13 January 2011 05:11
		Re: 2d min By: Gray on Thu, 13 January 2011 04:26
		Re: 2d min By: rogass on Wed, 12 January 2011 23:18
		Re: 2d min By: David Fanning on Wed, 12 January 2011 15:44
		Re: 2d min By: Gray on Wed, 12 January 2011 15:06
		Re: 2d min By: Kenneth P. Bowman on Wed, 12 January 2011 14:45

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