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Re: Histogram Too Many Array Elements [message #67851 is a reply to message #67732]

Tue, 25 August 2009 11:13

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

I wrote yesterday:

> When I am working with large images, and I want to
> plot a histogram, there are occasions when Histogram
> complains about "too many array elements". On the
> current image I am working on, for example, I am
> passing an array to Histogram that has 1,727,194
> elements.
>
> It is an odd sort of error. And it is not even clear
> to me that this is too many elements per se. It almost
> seems like the bin size plays a role, too.

As it happens this was the result of a misplaced NAN
keyword, so that images with NANs caused the histogram
bin size to be a NAN, resulting in the "too many
elements" error message.

I was running into this problem with the Coyote
Library program, XSTRETCH. I have updated this
program (which is used with IMGWIN, among other
programs) to work correctly. You can download an
updated version here:

http://www.dfanning.com/programs/xstretch.pro

Cheers,

David

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

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[Message index]

		Histogram Too Many Array Elements By: David Fanning on Mon, 24 August 2009 15:40
		Re: Histogram Too Many Array Elements By: David Fanning on Tue, 25 August 2009 11:13

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