problem with symbolic differentiation

I have a problem with an implementation of a problem. Suppose I have a function and then apply symbolic differentiation

 syms x;
 syms y;
 f= @(x,y) (x^2+x*y);
 f_x= matlabFunction(diff(f,x)); %%turns a sumbolic expression into a function of 2 variable
 f_y= matlabFunction(diff(f,y)); turns a symbolic expression into a function of 1 variable

How can I get a function of 2 variables in each case . maybe they are different ways of converting a symbolic expression into a function

Sincerely, Maria

Answer 1

[Walter Roberson]

matlabFunction(diff(f,y), [x,y])