How to graph a f(x,y) function?

I took a Matlab course over the summer, and now have to graph a problem in calculus. I am rusty on my commands, so I'm not sure which one to use. I am trying to make a 3-d plot of a function f(x,y)=-(x^2-1)^2-(x^2y-x-1)^2. Do I have to open a function, or can I just use a command with a script?

Answer 1

[Saikat Chakraborty]

syms x y
f(x,y)=-(x^2-1)^2-(x^2y-x-1)^2
ezplot(f)

Answer 2

[José-Luis]

x_int = [0 1];
y_int = [0 1];

[X Y]  = ndgrid(linspace(x_int(1),x_int(2),150),...
    linspace(y_int(1),y_int(2),150));

   myFun = @(x,y) (x.^2-1).^2-(x.^(2*y)-x-1).^2

mesh(X,Y,myFun(X,Y))

Answer 3

[Azzi Abdelmalek]

x=0:0.1:10;
y=0:0.1:10;
z=-(x.^2-1).^2-(x.^2*y-x-1).^2
plot3(x,y,z)

[Damon Bernard]

doesn't work