I am looking at two-dimensional gridded data from a kinked function, but need to make it smooth. Is there a two-dimensional version of the Schumaker-routine? I would also greatly appreciate pointers to MatLab code!

  • $\begingroup$ What do you mean by preserves shape? What do you mean by preserves differentiability if kinked functions are not differentiable at the kink points? Perhaps you could post a one dimensional image of a kinked function, a sample of points at which values are taken, and an interpolation line that has the properties you desire. $\endgroup$
    – BKay
    Dec 10 '15 at 13:03

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