Polyfit Vs Fit command: what are the differences?

90 visualizaciones (últimos 30 días)
PRB
PRB el 15 de Mayo de 2020
Comentada: PRB el 26 de Mayo de 2020
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

Respuesta aceptada

Jyotsna Talluri
Jyotsna Talluri el 25 de Mayo de 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.

Más respuestas (0)

Categorías

Más información sobre Fit Postprocessing en Help Center y File Exchange.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by