Polyfit with Some Coefficients Fixed

I want to fit a set of data using polyfit, but I want certain coefficients to have fixed values. E.g., if the data is to be fitted to a second order polynomial,

y(x)=ax^2+bx+c

I want c to always be equal to zero. Is it possible to define constraints on the polyfit or should I just move on to the Curve Fitting Toolbox?

Answer 1

[Torsten]

For the case you describe, you can use "polyfitn":

https://de.mathworks.com/matlabcentral/fileexchange/34765-polyfitn

Best wishes

Torsten.