matlab - Custom Curve-Fitting equation doesn' t works -


i trying fit custom equation cumsu=a+b*(1586-x).^m estimate parameters a,b,m.

data: cumsu=[...];%the reason don't give vector cumsu large number of values included. x=[1:1586];

i thankful if can helps me. thank in advance!

you can create custom fitting models via fit function.

fitobject = fit(x,y,fittype,fitoptions) 

in case should replace fittype fitting equation:

customfit=fit(x,cumsu,'a+b*(1568-x)^m') 

with random numbers output was:

general model:      f(x) = a+b*(1568-x)^m      coefficients (with 95% confidence bounds):        =      -2.011  (-2.959e+06, 2.959e+06)        b =       1.479  (-2.424e+06, 2.424e+06)        m =      0.1049  (-9.702e+04, 9.702e+04) 

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