Least squares solvers - Optimization Toolbox

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Sana KHALED
Sana KHALED 2021-12-3
评论： Sana KHALED 2021-12-3
I am working on the least square method using the otimization toolbox.
I would like to know the difference between lsqnonlin solver and lsqcurvefit solver ? I would also appreciate to know the meaning of the output values of: "funccount", "norm of step" and "first order optimality".
Thank you, in advance.

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Matt J
Matt J 2021-12-3
编辑：Matt J 2021-12-3
The only difference between the two solvers is the input syntax. lsqcurvefit has the more convenient syntax when the residuals are of the form,
resid = F(theta,x) - y
Explanations for the iterative display headings can be found here:
https://www.mathworks.com/help/optim/ug/iterative-display.html
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Sana KHALED
Sana KHALED 2021-12-3
Right, they differ in the input syntax, but since they both rely on the same algorithms (trust-region algorithm/levenberg-marquardt), then why don't they give the same values for the output parameters? That would mean that the calculation is not the same either, right?
Thank you.

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