How can I save the output parameters for each step using lsqnonlin function?

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I am performing a nonlinear least square estimation of some parameters of a rational function to fit some experimental data, and I would like to save the parameters (x) obtained for each optimization step (and not just the final values). What can I do?
Best regards,

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Alan Weiss
Alan Weiss 2022 年 8 月 3 日
Write an output function to save the values, either to a workspace variable or to a file. For syntax details, see Output Function and Plot Function Syntax.
Alan Weiss
MATLAB mathematical toolbox documentation

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