Posted by Charlie Martin on October 30, 1997 at 13:46:58:
I've come across a smoothing/interpolation technique
which uses a derivative constrained least squares
method in conjunction with cubic b-splines. Attractive
and useful features (for my application) include:
1. data can be irregularly spaced
2. both smoothing and interpolation are handled
by the technique.
3. the derivative constraint provides physically
relevant smoothing parameters which can
user specified. (One can specify the roll
off and the wavelength of the filter.)
4. Different (and reasonable) boundary constraints
can be imposed.
The code I have is very specific legacy fortran. I am
looking for public domain C or C++ code which I can
use for this application.
I'm not an expert in numerical methods, and so
perhaps the exiting packages already implement
these techniques. Is this smoothing/interpolation
method a common one, and can anyone point
me towards code that implements it?