Displaying results of lsqcurvefit after each iteration

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Sergio Quesada on 11 Jun 2018
Commented: Sergio Quesada on 12 Jun 2018
Good evening,
I have solved a problem with lsqcurvefit, and now I want MatLab to display the solutions found after each iteration. The problem is my objective function, called "Iteor", is obtained by fsolve, like this:
rteor=@(k,r) fsolve(@(r) arrayfun(@(R,T) FC.*integral(@(x) exp(-a./(x.*log(x))), 1, R)-(T-(.001.*k(1))),r,texp), inpts, options);
Iteor=@(k,r) ((.01.*k(2)./FC).*(rteor(k,texp)).*exp(a./(rteor(k,texp)).*log(rteor(k,texp))))+(Vo./(100.*k(3).*log(rteor(k,texp))));
k = lsqcurvefit(Iteor, x0, texp, Iexp,[],[],options)
I have tried with
options = optimoptions('lsqcurvefit','Display','iter');
but, it returns technical info, not the solutions of my parameters. I've also tried with
options = optimoptions('lsqcurvefit','PlotFcn','optimplotx');
,but it makes the program to plot the parameters values in a graph, and I want it displayed...
Thanks you !!

Alan Weiss on 11 Jun 2018
Write yourself a simple Output Function such as this:
function stop = outfun(x,optimVals,state)
stop = false;
switch state
case 'iter'
disp(x)
end
I just wrote this off the top of my head, so it might not be 100% right, but something like this will work. Include the output function in your options, and pass the options to lsqcurvefit.
Alan Weiss
MATLAB mathematical toolbox documentation
Sergio Quesada on 12 Jun 2018