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Article #130Re: Interpolation & Chaotic TS
From: Gabriel Landini
Date: Thu, 05 Nov 1992 17:07
Date: Thu, 05 Nov 1992 17:07
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2067 bytes
> > Given a chaotic time series with a fractal dimension, does anyone know of > any theory or whatever which relates splines to the interpolation of the > chaotic time series corresponding to the given fractal dimension? For > example, if I have a signal that can be best interpolated by cubic splines, > then that is what I would use (using a linear or quadratic spline would not > do so well). Now, given a chaotic time series (perhaps one similar to that > of Brownian motion), it would seem that you cannot interpolate it with any > spline of some order, or you need a very high order spline in order to > interpolate it accurately. This may sound crazy, but would it be that you > would need a spline of some fractional order (in relation to the fractal > dimension of the time series) in order to do an accurate interpolation? Or, > would the spline needed have to have fractal properties itself (a fractal > interpolating a fractal, so to speak. I got this idea from Barnsley's IFS > where a base fractal is used to interpolate a fractal image). > > If anyone can give me any guidance at all on this problem, I would greatly > appreciate it. Also, any reference to literature that may help me would > be nice. > > John > >------------------------------------------------------------------------------ If your time series is chaotic, then your spline will be always in some way "wrong". What is the point of getting a spline, then? Do you have any other example? How do you know that your time series is chaotic? Gabriel
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Newsgroups: sci.fractals Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!warwick!bham!ibm3090.bham.ac.uk!LANDINIG From: Gabriel Landini <g.landini@uk.ac.bham> Subject: Re: Interpolation & Chaotic TS Sender: usenet@rs6000.bham.ac.uk (USENET News Service) Message-ID: <920705170751@ibm3090.bham.ac.uk> Date: Thu, 5 Nov 1992 17:07:51 GMT References: <!7h13=#@rpi.edu> Organization: The University of Birmingham, United Kingdom Lines: 30