Interpolation and fitting

Polynomial interpolation
Polynomial interpolation

Rational interpolation
Rational interpolation

Spline interpolation
Spline interpolation

Least squares fitting (linear/nonlinear)
Least squares fitting (linear/nonlinear)

Bilinear and bicubic spline interpolation
Bilinear and bicubic spline interpolation

Fast RBF interpolation/fitting
Scattered interpolation/fitting in O(N*logN) time.

Introduction to RBF's
Introductory course to RBF interpolation

OBSOLETE: inverse distance weighting interpolation/fitting
Obsolete algorithm which was superseded by RBFs