Polyfit Vs Fit command: what are the differences?

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I would like to predict a quadratic curve (y=ax2 + bx + c) from a data set and the relative goodness of the fit model.
I used both the command polyfit (Polynomial curve fitting) and Fit (Fit the curve).
what is the difference between the two methods? Whit the second method I used 'normalize' but when I try to find the value with polyval the predicted data are no correct.
How can I test the goodness of the fit model if I use the command Poltyfit?
Thank you in advance

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Jyotsna Talluri
Jyotsna Talluri il 25 Mag 2020
Refer the below link to know the differences betwween fit and polyfit
We cannot determine the goodness of fit using polyfit.Use fit function to determine the goodness of fit.
[fitobject,gof] = fit(x,y,fitType)
returns goodness-of-fit in the structure gof.

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