lsqcurvefit constrain to real fitting parameters
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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
回答（1 个）
Adam Parry
2012-6-28
0 个投票
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?
1 个评论
Star Strider
2012-6-28
编辑：Star Strider
2012-6-28
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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