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Re: max, mean, min of array [message #28687 is a reply to message #28686]

Sun, 06 January 2002 11:50

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

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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