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Re: IDL Average Value Graphs [message #61500 is a reply to message #61413]

Thu, 17 July 2008 16:02

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jean H writes:

> the algorithm used is a bit fuzzy.... people, including myself, often
> complain here that some pixels get selected while other do not (make a
> few tests). As David mentioned, IDLgrROI provides better results. Now it
> all depends on what you are doing... if you select a few 100 000 pixels,
> you might not care that much about having a few extra/missing pixels!

I found the discussion we were having way back in 2001.
And there was even a test program that shows the problem.
(It's still a problem, I guess, as I just ran it in IDL 7.0.3.)

http://tinyurl.com/58cv6k

Cheers,

David

P.S. Does time pass exponentially faster as you age? Weird. :-(

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

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[Message index]

		IDL Average Value Graphs By: andybohn on Tue, 15 July 2008 13:51
		Re: IDL Average Value Graphs By: David Fanning on Thu, 17 July 2008 08:33
		Re: IDL Average Value Graphs By: andybohn on Thu, 17 July 2008 10:55
		Re: IDL Average Value Graphs By: Jeremy Bailin on Wed, 16 July 2008 11:18
		Re: IDL Average Value Graphs By: andybohn on Thu, 17 July 2008 18:11
		Re: IDL Average Value Graphs By: David Fanning on Thu, 17 July 2008 16:02
		Re: IDL Average Value Graphs By: Jean H. on Fri, 18 July 2008 10:20
		Re: IDL Average Value Graphs By: Jean H. on Thu, 17 July 2008 14:52
		Re: IDL Average Value Graphs By: David Fanning on Thu, 17 July 2008 12:09
		Re: IDL Average Value Graphs By: andybohn on Thu, 17 July 2008 11:02

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