How is the residual in lsqnonlin calculated?

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Gina Carts 2019-4-2

评论： John D'Errico 2019-4-2

Does anyone know how's the residual being calcualted in lsqnonlin function?

I am interested to know the formula.

Is it : res = sum(fun(x).^2) at x?

Where fun is the function you are trying to minimize.

Torsten 2019-4-2

编辑：Torsten 2019-4-2

5th line from above under

But as a user of lsqnonlin, you have to supply the residual vector as

res(i) = f_i(x)

where f_i(x) is the i-th function you want to zeroize.

John D'Errico 2019-4-2

Exactly. lsqnonlin does not calculate any residual. YOU calculate it, and return that to lsqnonlin, via your objective function.

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