splines – METAPOST macros for drawing cubic spline interpolants

This is a small package of macros for creating cubic spline interpolants in METAPOST or METAFONT. Given a list of points the macros can produce a closed or a relaxed spline joining them. Given a list of function values y_j at x_j, the result would define the graph of a cubic spline interpolating function y=f(x), which is either periodic or relaxed.

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