Parameter estimation when using ODE15i

Hi everyone,

I have an ODE15i code that runs successful. I have compared its results to the experimental results, the fitting is not poor if anything at all. I am trying to use fminsearch to estimate the parameters that can give a satisfactory fitting. However, I am unable to make the code to assign an output argument.I get the error message:

Output argument "B" (and maybe others) not assigned during call to "ParametersFittingODE15iMethod>ODE15iMethod".

Error in fminsearch (line 200)
fv(:,1) = funfcn(x,varargin{:});

Error in ParametersFittingODE15iMethod (line 148)
[b, B] = fminsearch(@ODE15iMethod,b);

I have attached both the working file and the file that gives an error.

Please help.

[madhan ravi]

what's b? upload the data.

[Dursman Mchabe]

Hi Madhan, Thanks a lot for the comment. b is a set of parameters that I expect fminserach to evaluate. b(1) ... b(31) is approximately equal to R ... kLa_CO2 in the working code. I expect fminsearch to evaluate the values that will make model to fit the experiments.