Using lsqcurvefit to estimate parameters, while solving daes using ode15i

Question

Dursman Mchabe 2019-1-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/439457-using-lsqcurvefit-to-estimate-parameters-while-solving-daes-using-ode15i

回答： Zhongfu Wang 2020-1-22

Hi all,

I am trying to estimate 13 parameters using lsqcurvefit, while using ode15i to solve 4 daes. The attached script gives an error message:

Error using decic (line 108)
Convergence failure in DECIC.
Error in ODE15iMethod>fitodes (line 39)
[x0,xp0] = decic(@ReneeMchabeWaterDAE,0,x0,[1 1 0 0],xp0,[],options);
Error in lsqcurvefit (line 213)
            initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
Error in ODE15iMethod (line 23)
cfit = lsqcurvefit(@fitodes,c0,t,y,lb,ub,options);
Caused by:
    Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.