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Re: Convolution, IDL & Numerical Recipes [message #32671 is a reply to message #32670]

Fri, 01 November 2002 06:01

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

Hector Aceves wrote:
> Hello..
>
> I am using IDL for some of my research and have a particular problem
> with convolution of two arrays. I have used IDL's CONVOL procedure
> and subroutine CONVLV given in NUMERICAL RECEIPES..both give
> different results. I hope some one can shed light on what the
> reason might be.
>
> Thank you. Hector
>

Perhaps you want to use the following keywords:
Check out the help file to see the effects the keywords
have on how the arrays line up to be convolved.
(Note: you must explicitly set center=0, or else it defaults
to 1)

z=convol(a,k,center=0,edge_wrap=1)

a 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0
k 1 0 0 0 0 0 0 0 0

z 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0

Cheers,
bob stockwell

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[Message index]

		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 06:48
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Fri, 01 November 2002 06:09
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Fri, 01 November 2002 06:01
		Re: Convolution, IDL & Numerical Recipes By: Kenneth P. Bowman on Thu, 31 October 2002 19:41
		Re: Convolution, IDL & Numerical Recipes By: James Kuyper on Thu, 31 October 2002 17:10
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Thu, 31 October 2002 14:29
		Re: Convolution, IDL & Numerical Recipes By: JD Smith on Thu, 31 October 2002 13:48
		Re: Convolution, IDL & Numerical Recipes By: aceves on Mon, 04 November 2002 18:55
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 06:53
		Re: Convolution, IDL & Numerical Recipes By: aceves on Fri, 01 November 2002 17:06

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