FitPoly Command

FitPoly( <List of Points>, <Degree of Polynomial> ): Calculates the regression polynomial of degree n.

FitPoly({(-1, -1), (0, 1), (1, 1), (2, 5)}, 3) yields f(x) = x³ - 1 x² + 1.

FitPoly( <Freehand Function>, <Degree of Polynomial> ): Calculates the regression polynomial of degree n for a function drawn by the Freehand Shape Tool.

CAS Syntax

FitPoly( <List of Points>, <Degree of Polynomial> ): Calculates the regression polynomial of degree n.

FitPoly({(-1, -1), (0, 1), (1, 1), (2, 5)}, 3) yields x³ - x² + 1.

For order n there must be at least n + 1 Points in the list.
See also FitExp Command, FitLog Command, FitPow Command and FitSin Command.
If you work with big/small numbers, you should consider normalizing them for a more accurate result, see Normalize Command.