ALGORITHM-716 TSPACK - TENSION SPLINE CURVE-FITTING PACKAGE

The primary purpose of TSPACK is to construct a smooth function which interpolates a discrete set of data points. The function may be requir ed to have either one or two continuous derivatives. If the accuracy o f the data does not warrant interpolation, a smoothing function (which does not pass through the data points) may be constructed instead. Th e fitting method is designed to avoid extraneous inflection points (as sociated with rapidly varing data values) and preserve local shape pro perties of the data (monotonicity and convexity), or to satisfy the mo re general constraints of bounds on function values or first derivativ es. The package also provides a parametric representation for construc ting general planar curves and space curves.