... same as before with a bit more doctoring.
You got the 3 types, strictly identical to known CAS
[Mathcad, Matlab ...]. So, you get the first & 2nd
derivatives. 1rst deriv is scalar, 2nd is discrete.
The spline function is scalar as well.

Remenber: the spline function and the 1rst derivative
don't support Smath derivative operator. No problem
working projects whereas "splines" are not interpolating
functions, only usable as discrete output, same as Mathcad.

Resume: Spline(x) & D(x) are interpolatable on-line
for 2nd deriv you have to linterp for on-line interpolation.

Hello Radovan: that should you make you happy.

Cheers all collabs.

Jean

Spline l_p_c [Suite].sm (116 KiB) downloaded 74 time(s).

Dear Jean,

Wrote

Hello Radovan: that should you make you happy.

I am always happy when you post your examples , and I am very grateful to you for that
As I said before, I would like there were many more SMath users like you.

Best Regards,
Radovan