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Curve Fitting to timeseries using a set of 8 sine and cosine functions [message #89550]

Fri, 24 October 2014 22:47

siumtesfai
Messages: 62
Registered: April 2013

Member

I think you should try to be for specific to ask question here.

Suppose I have a timeseries with the S size.

I want to do nonlinear fitting to the timeseries using the following fourier series ( harmonic function)

F(X) = ∑((Ancos(nπx/L)+Bnsin(nπx/L) ) , Where n = 1,2,3,4

And I would find 8 coefficients such as An and Bn where n = 1,2,3,4

That is.

A1,A2,A3,A4
B1,B2,B3,B4

I have attempted to understand how it works mpfit by Craig and curvefit . Unfortunately, I did not because I am not IDL expert. So I posted this if anyone can help

Best Wishes

Thanks for you help

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[Message index]

		Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Fri, 24 October 2014 22:47
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Yngvar Larsen on Sat, 25 October 2014 08:59
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Sat, 25 October 2014 10:33
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Sat, 25 October 2014 10:51
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Yngvar Larsen on Sat, 25 October 2014 12:34
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Sat, 25 October 2014 16:00
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Yngvar Larsen on Sun, 26 October 2014 11:05
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Craig Markwardt on Mon, 27 October 2014 08:52
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Mon, 27 October 2014 19:16
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Sun, 26 October 2014 18:45
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Yngvar Larsen on Mon, 27 October 2014 06:03
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Fri, 31 October 2014 20:12
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Yngvar Larsen on Sat, 01 November 2014 07:57
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Yngvar Larsen on Sat, 01 November 2014 12:05
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: Craig Markwardt on Sun, 02 November 2014 20:49
		Re: Curve Fitting to timeseries using a set of 8 sine and cosine functions By: siumtesfai on Tue, 04 November 2014 15:14

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