Interpolation and fitting

Polynomial interpolation
Polynomial interpolation

Rational interpolation
Rational interpolation

Spline interpolation
Spline interpolation

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

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Bilinear and bicubic spline interpolation
Bilinear and bicubic spline interpolation

Inverse distance weighting interpolation/fitting
Scattered interpolation/fitting