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lsqcurvefit constrain to real fitting parameters

조회 수: 4 (최근 30일)
Rosalie
Rosalie 2012년 5월 15일
Hi,
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));
thanks,
Rosalie

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 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?

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