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Math Forum » Discussions » sci.math.* » sci.math.num-analysis.independent

Topic: Which interpolation?
Replies: 4   Last Post: Dec 10, 2012 12:22 PM

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Cristiano

Posts: 22
Registered: 12/7/12
Which interpolation?
Posted: Dec 7, 2012 1:13 PM
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From a very slow simulation I got y= f(x):
x y
5 0.8048174
6 0.8194384
...
44 0.9706268
47 0.9724846
...
48765 0.9999756
53765 0.9999776

For every x, I stop the simulation when the confidence interval for y is
less than 2,5*10^-6 (with 99% of confidence).

I can't calculate all the x's (because the simulation is very slow), so
I need to interpolate; for example, I don't have y(45) or y(46).

Using the Levenberg-Marquardt Least Squares Fitting, the best equation I
found gives an error that is too high (about 10^-4 for small x's).

Then I thought to use a cubic spline, but I notice some "fluctuations"
on the tails.

Should I use LM or spline?

Thanks
Cristiano

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