[Maxima] approximating a curve
pip at iszf.irk.ru
Tue Dec 9 21:45:26 CST 2008
On Tue, 9 Dec 2008 08:21:31 -0700
Robert Dodier wrote:
> On 12/8/08, Valery Pipin wrote:
> > real life example. Using the Peter's Eggleton stellar evolution code
> > I've got a table of the stellar interior parameters for the Brown
> > Dwarf (0.2 M_sun, 0.006 L_sun). The parameters are pressure,
> > temperature, luminosity, density and etc.. . Now I want to use
> > their functional form in my dynamo model. The best way is to get the
> > Chebyshev approximations to them. I do as follows,
> > 1) read the table to maxima
> > 2) find the spline interpolation
> > 3) find the Chebyshev approximations
> Hey, that rocks. But I don't quite understand what's going on here.
> Why is there both a cubic spline and a Chebyshev approximation?
Agree, it is not an ideal way.
The problem is that I can not use the given spline approximations to
differentiate them further. I have use it to interpolate the table to
the Chebyshev nodes. It was a fast solution (in sense, that everything
is at hands).
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