please assist in line 18 , where " H = Hx (x0); " the error its giving me it says 'untitled' i am using steepest descent method for a school project

syms x1 x2
f1 = x1 ^2 * x2 + x1 *x2^2 - 3 *x1 *x2 ;
fx = inline (f1) ;
fobj = @ (x) fx (x (:,1 ), x(: ,2));
grad = gradient (f1);
G = inline(grad);
gradx = @ (x) G (x(: , 1),x(:,2));
H1 = hessian (f1);
Hx = inline (H1);
x0= [1 2];
maxiter = 4;
tol = 1e-3 ;
iter = 0;
X = [];
while norm(gradx(x0)) > tol && iter < maxiter
    X = [X  ; x0];
    d = -gradx(x0);
    H = Hx (x0) ;
    lam = d' * d./ d' * H * d ;
    Xnew = x0 + lam.* d' ;
    x0 = Xnew;
    iter = iter + 1;
end

Error using indexing
Not enough inputs to inline function.

fprintf('optimal solution x =[%f, %f] \n' , x0(1), x0(2));
fprintf('optimal value f(x) = %f \n' , fobj (x0));v

[Jan]

I let your code run to get the error message and inserted in in your question. This does not match your vague description "it says 'unitled'".

Please post a copy of the complete message, if you see another error. A rough paraphrasation is not useful to explain, what the error is.