lsqcurvefit constrain to real fitting parameters

조회 수: 3 (최근 30일)
Rosalie . 2012년 5월 15일
I'm trying to fit my data using the 'lsqcurvefit' command. However this returns me imaginairy fitting parameters, which I don't want. Is there any way to constrain the fitting parameters to real numbers?
The function I'm trying to fit is the following:
function F = eWLC(pp,y)
F = pp(2)*(1-1/2*sqrt(((4.1)./(y-pp(4))./pp(1)))+(y-pp(4))./pp(3));

답변 (1개)

Adam Parry
Adam Parry 2012년 6월 28일
I'm sorry that I don't have an answer but I am also suffering from the same problem.
Did you come up with a fix, or was it to do with the equation itself?
  댓글 수: 1
Star Strider
Star Strider 2012년 6월 28일
편집: Star Strider 님. 2012년 6월 28일
From a quick look, it would seem that constraining
pp(4) < y
might keep everything real, but without knowing more I can't be sure.
What are the parameter value estimates that 'lsqcurvefit' returns? Are the complex parameter estimates conjugates? How well does the resulting function fit the data?

댓글을 달려면 로그인하십시오.


Help CenterFile Exchange에서 Systems of Nonlinear Equations에 대해 자세히 알아보기

Community Treasure Hunt

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

Start Hunting!

Translated by