Not enough input arguments in function with fsolve

I can not figure out what causes this error in this function. Any help will be appreciated. Thanks!

function gx = gx_fermi(y,t1,t2 )

       options=optimset('Display','iter');

       gx=fsolve(@(t1,t2,y)[0 t1 6*(y^(1/2)) 0]*(t2-t1),[t1,t2,y],options);
       % disp(gx);

      gx=reshape(gx,[2,2]);
    end

[Matt J]

The problem you are solving with fsolve looks highly degenerate. There is a continuum of solutions over the sets of points {t1=t2} and over {t1=y=0}.

Answer 1

[Matt J]

fun = @(x) [0 x(1) 6*(x(3)^(1/2)) 0]*(x(2)-x(1));

gx=fsolve(fun ,[t1,t2,y],options);