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Re: Anisotropic smoothing operations [message #24835 is a reply to message #24833]

Thu, 26 April 2001 10:15

Ben Tupper
Messages: 186
Registered: August 1999

Senior Member

Jaco van Gorkom wrote:

>> ...
>> Is there a way to make CONVOL treat missing data as SMOOTH does?
>
> What I do is set all NaN values in the input array to zero, do the smoothing with CONVOL, and divide
> the result by a similarly smoothed version of the original FINITE(InputArray). Where this division
> is one by zero, the output element should be NaN, which you might want to set it to by hand to avoid
> the arithmetic error thing. If you want to bother.
>

Hello,

That's a good idea. I'm not sure how to implement it in my situation.

I am using a routine for building a 2d grid from scattered data. The grid is initialized with a user
defined MISSING value (in my case, NAN.) The data is sprinkled over the grid then smoothed with the
moving boxcar. This sprinkle/smooth sequence is repeated a number of times. Using SMOOTH, the NANs
are replaced by (real) smoothed values as the influence of the scattered data values grows outward. It
is possible (likely) that there will be NANs remaining on the grid after the sprinkle/smooth iterations
have been completed. These areas will be in the regions of the grid where the original data values are
sparse. That is the effect I would like to achieve.

Thanks,

Ben

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Ben Tupper
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[Message index]

		Re: Anisotropic smoothing operations By: Ben Tupper on Thu, 26 April 2001 15:31
		Re: Anisotropic smoothing operations By: Craig Markwardt on Thu, 26 April 2001 11:41
		Re: Anisotropic smoothing operations By: Ben Tupper on Thu, 26 April 2001 10:15
		Re: Anisotropic smoothing operations By: Jaco van Gorkom on Thu, 26 April 2001 03:25

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