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Re: max, mean, min of array [message #28682]

Mon, 07 January 2002 02:52

dinhnq
Messages: 14
Registered: December 2001

Junior Member

Thank you all for your suggestions. Now it works.

Dinh Huong

Wayne Landsman <landsman@mpb.gsfc.nasa.gov> wrote in message news:<3C38AA76.69754BEC@mpb.gsfc.nasa.gov>...
> Dinh Huong wrote:
>
>> Dear Lists,
>>
>> I have an array of 400,400,10 contains 10 month Tï¿½ of 400x400 pixel
>> area. I am trying to calculate min, max, mean Tï¿½for each pixel and
>> output is 400x400 image. How to solve this by IDL?
>> Any help will be appreciate,
>
> In IDL V5.5, if you have a 400 by 400 by 10 array, you can find the
> maximum over the 3rd dimension using the DIMENSION keyword.
>
> IDL> pixmax = max(array, dimen=3) ;Return a 400 x 400
> array
>
> In earlier versions of IDL you have to loop over each pixel, and (as
> David mentioned) Craig Markwardt's CMAPPLY will make sure that this
> looping is done as efficiently as possible.
>
> --Wayne
>
> P.S. While I am grateful to RSI for adding dimension-specific
> capabilities in V5.5 to MIN, MAX, FFT, and SMOOTH, I would still very
> much like to see the same capability added to MEDIAN. (The customer
> is never satisfied....)

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[Message index]

		Re: max, mean, min of array By: dinhnq on Mon, 07 January 2002 02:52
		Re: max, mean, min of array By: Craig Markwardt on Sun, 06 January 2002 12:25
		Re: max, mean, min of array By: Wayne Landsman on Sun, 06 January 2002 11:50
		Re: max, mean, min of array By: David Fanning on Sun, 06 January 2002 07:42
		Re: max, mean, min of array By: Alex Schuster on Wed, 23 January 2002 07:04
		Re: max, mean, min of array By: Craig Markwardt on Thu, 24 January 2002 07:29

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