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The Behavior of CONVOL
| Re: The Behavior of CONVOL [message #7399 is a reply to message #7324] |
Mon, 04 November 1996 00:00  |
Christian Soeller
Messages: 46
Registered: August 1996
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"Kevin R. Turpie" <turpie@seaeagle.gsfc.nasa.gov> writes:
> I'm afraid you missed the point; normalization doesn't have anything
> to do with it. It is the orientation of the kernel. In a convolution
> the kernel "flipped" wrt to the function being convolved. In a
> correlation is is not. With CENTER=1 (default), CONVOL uses the same
> orientation as a correlation. With CENTER=0, it does not.
Your observation is correct. If you want to have the normal convolution
behaviour you have to replace your kernel k(u) by k(-u) (here assuming
a centered notation). I came across it when doing deconvolutions. Something
to watch out for when using nonsymmetric kernels.
If it is not yet in the FAQ it should definitely go there.
Best regards,
Christian
------------------------------------------------------------ --------
Christian Soeller mailto: csoelle@sghms.ac.uk
St. Georges Hospital Medical School Dept. of Pharmacology
Cranmer Terrace London SW17 0RE
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