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Re: How can one improve the derivative? [message #86681 is a reply to message #86680]

Thu, 28 November 2013 05:06

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

Le jeudi 28 novembre 2013 13:28:40 UTC+1, g.na...@gmail.com a écrit :
> Hi
>
>
>
> I read the SAVGOL function but there is something I didn't understand very well. How can I choose the nL and nR?

Afaik, there is no definite rule. At order 0, the Savitzky-Golay filter is a smoothing filter of length nL+nR. The rule of thumb would be to keep the filter width not much larger than the narrowest feature you want to preserve. At higher order, it is a derivative filter. The filtering rule should be the same.
The best way is to try...
alx.

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[Message index]

		How can one improve the derivative? By: g.nacarts on Wed, 27 November 2013 04:25
		Re: How can one improve the derivative? By: David Fanning on Wed, 27 November 2013 05:26
		Re: How can one improve the derivative? By: wlandsman on Wed, 27 November 2013 06:46
		Re: How can one improve the derivative? By: lecacheux.alain on Wed, 27 November 2013 06:50
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 04:28
		Re: How can one improve the derivative? By: lecacheux.alain on Thu, 28 November 2013 05:06
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 05:27
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 05:35
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 06:22
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 06:27
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 06:42
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 06:48
		Re: How can one improve the derivative? By: g.nacarts on Thu, 28 November 2013 07:08
		Re: How can one improve the derivative? By: David Fanning on Thu, 28 November 2013 07:12
		Re: How can one improve the derivative? By: lecacheux.alain on Thu, 28 November 2013 08:53

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