How can I make matrix dimensions to agree?

Hi all, I get an error message:

Matrix dimensions must agree.

Error in lsqcurvefit/objective (line 279)
         F = F - YDATA;

Error in snls (line 333)
            newfvec = feval(funfcn{3},xcurr,varargin{:});

Error in lsqncommon (line 167)
            snls(funfcn,xC,lb,ub,flags.verbosity,options,defaultopt,initVals.F,initVals.J,caller, ...

Error in lsqcurvefit (line 271)
    lsqncommon(funfcn,xCurrent,lb,ub,options,defaultopt,allDefaultOpts,caller,...

Error in CurveFitting (line 135)
[theta,Rsdnrm,Rsd,ExFlg,OptmInfo,Lmda,Jmat]=lsqcurvefit(@kinetics,theta0,t,c);

when I run the attached code. What could be the cause of the disagreement?

Kind Regards Dursman

Answer 1

[KALYAN ACHARJYA]

That means F =F-YDATA must be in the same dimension.

Please ensure that F and TDATA must be same before doing subtraction operation.

I have noticed in your code dcdt(2), dcdt(3),...what do these mean, are those scalar or vector variables?

Why you mixed up the function descriptions with other body code?

[Dursman Mchabe]

Thanks a lot for the answer.

dC = dcdt

And dcdt is a set of 7 differential equations dcdt(1) ... dcdt(7).

They are vectors.

[KALYAN ACHARJYA]

Welcome, @Dursman If all dcdt(1) ... dcdt(7) are calculated from the same expression, you can use the dcdt(i) indexing the way to find it.

Happy to Help