Setting your own start points for curve fitting

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J.S. 2018-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/407746-setting-your-own-start-points-for-curve-fitting

回答： Walter Roberson 2018-6-27

I have a set of data which I am attempting to fit via a modified ("custom") two-exponential function: a*exp(b*(x-x0))+c*exp(d*(x-x0))+y0, where x0 and y0 are known. I know how to set upper and lower bounds for a,b,c,d, but how can I specify starting values (start points) for them?

Thanks in advance.

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Adam Danz 2018-6-27

编辑：Adam Danz 2018-6-27

I see, what function are you using to do the fitting? For most of matlab's fitting functions, the 2nd input is "x0" which is a vector of values [1-by-n] for the n parameters of the function you're fitting. If the parameters in your function are [a,b,c,d] with an expected outcome of [100, 20, .5, -2], then that vector would be the input to 'x0'.

J.S. 2018-6-27