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Re: Problem with histogram calculation - please need help [message #59965 is a reply to message #59961]

Mon, 21 April 2008 07:52

moxament
Messages: 26
Registered: April 2008

Junior Member

On 21 Απρ, 16:43, David Fanning <n...@dfanning.com> wrote:
> moxam...@gmail.com writes:
>> I have a floating-point array d with dimensions 300x300. The minimum
>> value of the array is 3.07527 x 10^9 and the maximum value is 1054.91
>> x 10^9. I can not calculate the histogram of the array. I get the
>> following message:
>
>> ENVI> hist = HISTOGRAM(d)
>> % Array has too many elements.
>> % Execution halted at: $MAIN$.
>
>> Can anyone tell me how can I overcome this problem please.
>
> I think I would set your bin size more appropriately. :-)
>
> Something like this would probably work:
>
> binsize = (Max(array) - Min(array)) / 100
>
> 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.")

Hi Dr. Fanning,

Thank you very much for your response. I did what you said and I did
not get the error message. But the resulted histogram is incorrect. I
can see the histogram of the image (array) in ENVI correctly but what
I want is to calculate the histogram in my algorithm code using the
HISTOGRAM function. I can not understand what I can do and why I have
so much troubles with this function. It is critical for me to
calculate the histogram of the image (array) using the HISTOGRAM
function. Please, do you know why the resulted histogram from this
function is wrong and what I can to in order to calculate the same
histogram that the ENVI shows.

your help is appreciated,

Dabboor

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[Message index]

		Re: Problem with histogram calculation - please need help By: David Fanning on Mon, 21 April 2008 08:35
		Re: Problem with histogram calculation - please need help By: David Fanning on Mon, 21 April 2008 08:30
		Re: Problem with histogram calculation - please need help By: moxament on Mon, 21 April 2008 07:52
		Re: Problem with histogram calculation - please need help By: David Fanning on Mon, 21 April 2008 06:43

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