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polyfit vs. fit

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Giles_T_R_Abbbit
Giles_T_R_Abbbit 2016-4-11
回答： Star Strider 2016-4-11
It seems to me that there are 2 methods to programmatically (as opposed interactively using the curve fitting toobox) fit a 5th order polynomial to a set of data:
the first is to use 'polyfit':
p = polyfit(x, y, 5)
alternatively, it is possible to use 'fit':
p_fitobject = fit(x, y, 'poly5')
Why would I use one over the other?

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Star Strider
Star Strider 2016-4-11
Those of us without the Curve Fitting Toolbox (like me) would of course have to use polyfit. (With the Statistics Toolbox and Optimization Toolbox, I can do all the other curve-fitting I need to do.) The one advantage I see to polyfit is that as I understand it, fit by default scales and centres the variables, whereas in polyfit that’s an option.

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