Displaying 1 result from an estimated 1 matches for "extendknots".
2006 Nov 15
1
splineDesign and not-a-knot conditions
Hi,
I would like to fit an (interpolating) spline to data where the
derivatives at the endpoints of the interval are nonzero, thus the
natural spline endpoint-specification does not make sense. Books (de
Boor, etc) suggest that in this case I use not-a-knot splines.
I know what not-a-knot splines are (so if I were solving for the
coefficients directly I knew how to do this), but I don't