Fitting a smoothing spline method

hey, I have a dataset x=[NaN 1 2 3 NaN NaN 4 7 9 NaN 8 28 8 ]; and I would to know how to fit a smoothing spline method to this data?

Answer 1

[William Smith]

spline takes data in the format ( known X's, known Y's, desired X's)

So, for example:

desiredx=1:0.1:13;
xfitted = spline(1:numel(x), x, desiredx);
plot(desired, xfitted);

That's just a simple cubic spline. See also 'pchip', which has the same API. Smoothing splines more formally have a 'pressure' to penalise excessive curvature. If you need them, they're in the Curve Fitting Toolbox.