SIAM Journal on Numerical Analysis, Vol. 8, No. 1 (Mar., 1971), pp. 67-74 (8 pages) It is shown that if x ∈ C4[a, b] is approximated by a natural cubic spline, then ...

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 ...

SIAM Journal on Applied Mathematics, Vol. 43, No. 2 (Apr., 1983), pp. 278-288 (11 pages) The use of a prefilter prior to sampling or resampling can lead to reduced ...