Curve Fitting

EXPFIT	Fit y(x) = A e^B^x using linearization
GAUSSFIT	Fit y(x) = A e^-B^(x-C)2 using linearization
IGRID	Interpolate XYZ data to regular grid using the Inverse Distance Method
INTERP2	Perform two-dimensional linear interpolation
INTERPOLATE	Linear interpolation of a series.
LFIT	Fit a line to a series using the end points
LINFIT	Least squares method of fitting an arbitrary set of basis functions to a series.
LINREG	Fit a line to series
LINREG2	Regress two series
LSINFIT	Least squares method of fitting sine curves of known frequency
PFIT	Least squares polynomial fitting with error statistics
POLYFIT	Return polynomial coefficients
POLYGRAPH	Graph polynomial fit
POWFIT	Fit y(x) = A x^b using linearization
SINFIT	Fit y(x) = A + B sin(Cx + D) using the FFT
SINFIT3	Fit y(x) = A cos(2πfx + B) + C using least squares
SINFIT4	Fit y(x) = A cos(2πfx + B) + C using iterative least squares
SINTREND	Fit y(x) = A + Bx + C sin(Dx + E) using the FFT
SPLINE	Cubic spline interpretation
SPLINE2	Perform two-dimensional cubic spline interpolation