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Re: Convolving speed issue [message #59831]

Fri, 18 April 2008 06:17

pgrigis
Messages: 436
Registered: September 2007

Senior Member

rog...@googlemail.com wrote:
> Thank you again, Paolo. Your code works better and much faster than
> mine one- but unfortunately only for small matrices.

Can you specify what problems you are having with large matrices?
Do you get an IDL error, or it is just too slow for you or what?

Ciao,
Paolo

> I tried to build
> the code for the method presented here:
>
> http://www.mathworks.com/access/helpdesk/help/techdoc/index. html?/access/helpdesk/help/techdoc/ref/conv2.html&http:/ /www.google.com/search?q=conv2
>
> I don't understand, why it works for small matrices and not for big
> ones. Maybe its depending on how differ the number of elements in each
> dimension of each matrix.
>
> The FFT method has also the same problem.
>
> Any other solutions or recommendations, why it won't work with medium
> matrices e.g. a[0:35,0:59] and b[0:59,0:119]
>
> Maybe with reform(rebin...
>
> Thanks and best regards
>
> Chris

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[Message index]

		Re: Convolving speed issue By: pgrigis on Fri, 18 April 2008 06:17
		Re: Convolving speed issue By: rogass on Fri, 18 April 2008 02:16
		Re: Convolving speed issue By: rogass on Fri, 18 April 2008 01:13
		Re: Convolving speed issue By: pgrigis on Thu, 17 April 2008 13:42
		Re: Convolving speed issue By: pgrigis on Thu, 17 April 2008 13:03
		Re: Convolving speed issue By: rogass on Thu, 17 April 2008 11:54
		Re: Convolving speed issue By: pgrigis on Thu, 17 April 2008 10:16
		Re: Convolving speed issue By: rogass on Mon, 21 April 2008 08:08

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