Why my fminsearch do not work?

Hi all! I would like to know why my fminsearch function do not work. The error that I received is: Subscripted assignment dimension mismatch.

Subscripted assignment dimension mismatch.

Error in fminsearch (line 191)
fv(:,1) = funfcn(x,varargin{:});

Error in GINO_programme (line 62)
                [A,fval,exitflag] = fminsearch(@GINO_function,y0,options);

the script is:

I FILE

function BA=GINO_function(A)
global DB_temp r T mv_equity_t sig_E
V= A(1,1);
sig_v= A(2,1);
d1=log(V/DB_temp)+(r+(0.5*(sig_v).^2))*T/(sig_v*sqrt(T));
d2=d1-(sig_v*sqrt(T));

BA(1,1)=mv_equity_t- V*normcdf(d1)+ DB_temp*exp(-(r*T))*normcdf(d2);
BA(2,1)=sig_E* mv_equity_t-normcdf (d1)*sig_v*V;

II FILE

    options = optimset('Display','iter');
                  [A,fval,exitflag] = fminsearch(@GINO_function,y0,options);

I used to run this program fsolve but eh sintax of fsolve and fminsearch is the same no? Why matlab creates this error if with fsolve works? Thank you a lot

Answer 1

[Matt J]

I used to run this program fsolve but eh sintax of fsolve and fminsearch is the same no?

No, fminsearch works with a scalar objective function. Try this instead

 [A,fval,exitflag] = fminsearch(@(y) norm(GINO_function(y)),y0,options);