恳求高手指点

function [] = lsqFuncTion()
           
%与指数模型Y=b*exp(a*T)拟合
T=[0 120 744 912 1080 1248 1416 1584 1752 1920 2088 2256 2424 2592];
% f2=feval(fun2, b, T);
%fun2=@(b,T)b(1)*exp(b(2)*T)
%fun2 = inline('b(1)*exp(b(2)*T)', 'b', 'T');
%fun2 =  inline('b(1) .* T + b(2)', 'b', 'T');
Z=[0.523 0.523 0.175 0.525 0.524 1.989 0.525 1.989 1.989 1.989 0.523 0.524 0.524 0.525 0.523
   0.52     0.52    0.964 0.52 0.521 0.521 0.909 1.133 1.989 1.989 0.519 0.52 0.521 0.521 0.521
   0.512 0.511 0.178 0.513 0.512 1.012 1.091 0.512 0.517 0.127 0.512 0.512 0.512 0.512 0.77
   0.52     0.52 1.024 0.958 0.513 0.511 0.512 0.944 0.912 0.112 0.512 1.989 1.989 1.989 1.515
   0.512 0.512 0.175 0.521 0.523 0.522 0.524 1.989 1.989 1.989 0.523 1.989 1.989 0.199 1.989
   0.523 0.523 0.87 0.521 0.516 0.989 0.518 0.517 0.517 0.517 1.989 0.516 0.516 0.516 0.515
   0.512 0.512 0.871 0.525 0.527 1.42 0.643 1.993 1.083 0.097 0.519 1.989 1.989 1.989 1.989
   0.515 0.515 0.836 0.513 0.524 0.524 0.525 0.524 1.348 0.524 1.989 0.523 0.524 0.523 0.523
   0.519 0.519 0.888 0.517 0.521 0.521 0.521 1.053 0.86 0.099 1.948 0.519 0.52 0.521 0.521];

i=0;
while i<9
    i=i+1;
    Y=Z(i,:);
    %Y = fun2( [1511, 0.958], T); %for test, use a idea data
   
    [b, resnorm2]=lsqcurvefit(@fun2, [, ], T, Y);    %--for child fun2
    %b =lsqcurvefit(fun2, [0, 0], T, Y);    %--for inline fun2

    % 函数的拟合值
    F2(:,i)=fun2( b, T);   
    R2(:,i)=resnorm2;
    para21=b(1,1);
    A2(:,i)=para21;
    para22=b(1,2);
    B2(:,i)=para22;
    bb(i, :) = b;
end
bb(1,1 )= 111;

%-------------------------
function Y = fun2(b, T)
      Y = b(1)*exp(T.*b(2));  

总是报错
??? Error using ==> optimprivatelsqncommon
Function value and YDATA sizes are incommensurate.
Error in ==> lsqFuncTion at 27
    [b, resnorm2]=lsqcurvefit(@fun2, [1511, 0.958], T, Y);    %--for child fun2
我那个初值不知道该怎么取，总是。。。还求高手指点！不胜感激！致礼！