Parameters obtained using lsqcurvefit results in complex numbers.

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Ghansyam Vadodaria
Ghansyam Vadodaria 2019-6-28
评论： Torsten 2019-7-3
Hi. I tried to fit simultaneous ODE using lsqcurvefit. Code works well and provide parameters. But parameters are coming as complex number. In my case parameters must be real number. How to restrict parameters to real numbers using lsqcurvefit?
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Ghansyam Vadodaria
Ghansyam Vadodaria 2019-7-3
Torsten,
You were a great help. I solved my problem with the help of your valuable inputs. NonNegative option did not work for my problem, but other suggestion (abs(PP(1))^a) worked for me. Now I am getting parameters which are real. Thank you so much for your valuable response.
Torsten
Torsten 2019-7-3
But note that by this trick, the results of your ODEs might have changed compared to the original ODE without the abs().

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