Using lsqcurvefit to estimate parameters, while solving daes using ode15i

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.

What can I try?

Answer 1

[Zhongfu Wang]

Hi,

I was wondering have you solved this problem? Now, I am facing the same problem. I am trying to use lsqnonlin to fit parameters, while using ODE15i.