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Re: subset a 2d array [message #61937 is a reply to message #61932]

Wed, 13 August 2008 20:53

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

xiao writes:

> hmmm... The problem is I have a array like 240*500. And all the
> values are different. And I do not know the row and column. I only
> know the center value should be 2.5 . Then ,how can I do that? :)

index = Where(array EQ 2.5, count)
xy = array_indices(array, index[0])
subarray = array[xy[0]-1:xy[0]+1, xy[1]-1:xy[1]+1]

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: subset a 2d array By: xiao zhang on Thu, 14 August 2008 09:46
		Re: subset a 2d array By: David Fanning on Thu, 14 August 2008 09:34
		Re: subset a 2d array By: xiao zhang on Thu, 14 August 2008 09:24
		Re: subset a 2d array By: xiao zhang on Thu, 14 August 2008 07:54
		Re: subset a 2d array By: David Fanning on Wed, 13 August 2008 20:53
		Re: subset a 2d array By: xiao zhang on Wed, 13 August 2008 20:22

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