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Re: How can one improve the derivative? [message #86668 is a reply to message #86662]

Wed, 27 November 2013 06:50

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

Le mercredi 27 novembre 2013 13:25:06 UTC+1, g.na...@gmail.com a écrit :
> Hi
>
>
>
> I had to differentiate noisy data - which is a problem. I was wondering, how can one improve the derivative?
>
> I read on a blog that one way is to make a Fourier filtering afterwards and another way is to apply a "smoothed" or "filtered" gradient. But I had no idea how to do this in IDL. Can anyone help?
>
>
>
> Thanks in advance

Differentiating noisy data can often be obtained by convolution with a Savitzky-Golay filter. In IDL, look at SAVGOL and CONVOL functions.

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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