surface

E02CAF   Least-squares surface fit by polynomials, data on lines
E02DAF   Least-squares surface fit, bicubic splines
E02DCF   Least-squares surface fit by bicubic splines with automatic knot placement, data on rectangular grid
E02DDF   Least-squares surface fit by bicubic splines with automatic knot placement, scattered data
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© The Numerical Algorithms Group Ltd, Oxford UK. 2001