I have a small request. It would be nice if the spline classes are a bit more documented.

There are several Spline classes TSpline (TSpline3, TSpline5) and TSplinePoly (TSplinePoly3, TSplinePoly5). I assume, that 3 and 5 refer to the polynom order. However, what is the difference between TSpline and TSplinePoly? I know interpolation splines with the spline passing through the measurement points. Then there are fitting splines which account for each measurement point but do not pass through them necessarily. Then I know also fitting splines where one chooses a larger interval size than just the interval between subsequent measurement points, i.e. one has much less intervals for the polynoms than measurement points.

Iām now interested in what is maybe implemented in which of the above classes?

Thanks for any help