Least Squares Piecewise Cubic Curve Fitting The matrices involved in a linear least squares formulation are determined for the problem of fitting piecewise cubic functions, those possessing a continuous derivative, to arrays of planar data. CACM June, 1973 Ferguson, J. Staley, P. A. curve fitting, data reduction, function approximation, approximation splines 5.13 CA730612 JB January 23, 1978 1:47 PM 2488 5 2488 2488 5 2488 2488 5 2488