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Re: Convolution, IDL & Numerical Recipes [message #32745 is a reply to message #32671]

Mon, 04 November 2002 18:55

aceves
Messages: 4
Registered: October 2002

Junior Member

"R.G. Stockwell" <sorry@noemail.now> wrote in message news:<3DC28954.7060605@noemail.now>...
>
> 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

Dear Bob...

It works well with the kernel [1,0,...]
But when I tried the actual examples of Numerical Recipes it did not
give me the same results:

a=[0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0]
k=[0,0,1,1,1,1,0,0,0]

z=convol(a,k,center=0,edge_wrap=1)
IDL> print,z
0 0 0 0 0 0 0 1 2
3 4 4 3 2 1 0
IDL>

With Numerical Recipes gives..

0 1 1 1 1 1 0 1 2 3 3 3 2 1 0 0

which seems ok!

Any other Idea? someone?

Thanks

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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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