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Re: divide by zero problems [message #15355 is a reply to message #15333]

Tue, 11 May 1999 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <3737C79C.372FA82E@aims.gov.au>,
Mark Rehbein <mrehbein@aims.gov.au> wrote:
> composite=sum image/ sum mask.
>
> sometimes my images are very cloudy and as such my "sum mask" has zero's
> in it and likewise for my "sum image". So I get divide by zero's and
> NaN's in my resultant composite image. In fact I get whole image of
> NaN's in my composite even though my sum image and sum mask have decent
> values in them.

Rather than using 0 in the mask image you could use a small non-zero value
like 1e-6.

Another option is after the division you can set the NaN values to another
value. The following statement will set NaN pixels in an image to 0.

image(where(image ne image))=0

Eric
--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
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[Message index]

		Re: divide by zero problems By: edward.s.meinel on Thu, 13 May 1999 00:00
		Re: divide by zero problems By: <asowter on Thu, 13 May 1999 00:00
		Re: divide by zero problems By: korpela on Tue, 11 May 1999 00:00
		Re: divide by zero problems By: davidf on Tue, 11 May 1999 00:00

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