This example then specifies a smoothed spline interpolation method on the GRID statement. As shown by the following output, the resulting surface plot is smoother still. libname reflib ...

libname reflib 'SAS-data-library'; goptions reset=global gunit=pct border cback=white colors=(black blue green red) ftext=swiss ftitle=swissb htitle=6 htext=3; title 'Surface Plot after Partial ...

Cubic spline interpolation schemes which require no derivative information at the end points are of great practical importance and have been included in several ...