3d dimensional surface

I'm trying to plot a 3d dimensional surface. The function given is The code below is the one I'm using.

v = [-2:0.1:2];
w = [-2:0.1:2];
[X,Y] = meshgrid(v,w);
Z = 6*X^2-4*X^2*Y^2;
figure(3);
surf(X,Y,Z)

And this is the output in MATLAB:

Now when I do this in Wolfram alpha i'm getting a much smoother surface. So I'm wondering what I am doing wrong: https://www.wolframalpha.com/input/?i=3d+plot+6x%5E2-4x%5E2y%5E2

Answer 1

[G A]

v = [-2:0.1:2];
w = [-2:0.1:2];
[X,Y] = meshgrid(v,w);
Z = 6*X.^2-4*X.^2.*Y.^2;
figure(3);
surf(X,Y,Z)

[Biha Dirks]

I'll try this tommorow. What does the point mean?

[G A]

The point means element by element operation between arrays and matrices.

https://uk.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

[Biha Dirks]

It is much smoother now but It's still not the same as the 3D plot on Wolfram Alpha.

[G A]

Not the same in which way? 3D plot on Wolfram Alpha has different limits for X and Y than those of yours given by v and w.