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Re: 2d min [message #74371 is a reply to message #74370]

Thu, 13 January 2011 04:26

Gray
Messages: 253
Registered: February 2010

Senior Member

On Jan 13, 2:18 am, chris <rog...@googlemail.com> wrote:
> 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

This gets me a NxN array of minima... I want a vector of minima of
length M (so the minimum in each plane).

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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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