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.

The author is Daniel H. Luecking. The package is Copyright © 2002-2005 Daniel H. Luecking.