lsqcurvefit.m ... how to find intermediate steps?

2 次查看(过去 30 天)
Hi
I'm fitting using lsqcurvefit and the OUTPUT structure tells me there are 4 steps with 20 function evaluations before the stopping criteria is reached. Is there any way to find the parameter values at each of these steps?
My goal is to plot each fit to demonstrate the improvement between model and data.
Regards, Michael
  1 个评论
Michael
Michael 2012-10-31
I'm trying to do this using output functions, but the form of the function seems very restrictive, and it doesn't allow me to store the intermediate values in some pre-allocated matrix. All I can do is print the output, which means everything from that point on must be done manually... any help?

请先登录,再进行评论。

回答(2 个)

Sean de Wolski
Sean de Wolski 2012-10-31
You could have your objective function print to a text file explicitly or keep a persistent variable around that stores the intermediate steps.
  4 个评论
Matt J
Matt J 2012-10-31
编辑:Matt J 2012-10-31
His post says that there are 4 "steps" (I assume that means iterations) and 20 function evaluations, and that he wants the parameter values at each of the "steps", not at each function evaluation.

请先登录,再进行评论。


Matt J
Matt J 2012-10-31
编辑:Matt J 2012-10-31
No, it's not true that you can't store intermediate output to a matrix using an OutputFcn. The following example shows how to do this

类别

Help CenterFile Exchange 中查找有关 Encryption / Cryptography 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by