If I try to fit a function to a given data, and if i already define the parameters of the function , after fitting I am getting different parameters ?? I did not understand this part.
and also If I fit the function without setting parameters , after fitting I did not get the same parameters which I got earlier (not too much variation though).
yes but ain’t these parameters the coefficients of x^2 , x, constant?? which we have already set in our code. so these parameters should be same as our our set parameters.
also if you fit the same thing without setting parameters in the code, we get different parameters.