How to chose the initial values for the coefficeints in nlinfit

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Prince Alex
Prince Alex 2014-7-22
回答： Robert Cumming 2014-7-22
How to chose the initial values for the coefficients in nonlinear fit:
say I am tying to fit using
a=nlinfit(x,y,'modelfun',a)
with a is the initial values for the coefficients
say I have define vector a as a=[0.1 1 1 1 0.1]
how to assign these initial values and what are these matrix elements (0.1,1,1,1,0.1) indicates.?

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回答（1 个）

Robert Cumming
Robert Cumming 2014-7-22
The values of "a" known as beta in the functions help are the initial values that the model will use as parameters in your 'modelfun'.
The values are 100% dependent on your model - you can start with zeros, ones or values which are "likely" to be near the end result - it can effect the solution so think about it carefully in advance.

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