Steema Central

What formulas are used for calculating Curve Fitting and Smoothing functions in TeeChart ActiveX v7.0.0.4?

Hi Alex,

For curve fitting functions:

TCurveFittingFunction constructs a polynomial line based on its DataSource Series values.

The algorithm used to fit the points is a Gaussian Polynomial.

Use the PolyDegree property to determine the number of polynomial coefficients.

Regarding smoothing function please have a look at this Martijn van Engeland message whose interpolations TeeChart uses, with his permission.

What are valid values for PolyDegree (Curve Fitting) and Factor (Smoothing)?

Hi Alex,

The degree of the polynomial is configurable from 2 to 20. Smoothing factor goes from 1 to 100.