Posted by Scott Betts on November 05, 1997 at 12:02:29:

In Reply to: Interpolation-Derivative constrained LS b-splines 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?

: Thanks,

: Charlie

We have a fortran converter called F2C but I haven't

a clue if it will work on "legacy" fortran. (I'm not

all that familiar with fortran...:) If you want to try

it, it's at: