errors with quiver!

Hello there,

...hopefully my intentions with the input below is understood. What exact changes should I consider with line 4 or 5? There's always an error issue here. Thanks, I'm new to this.

spacing = 0.2;

[X,Y] = meshgrid(-2:spacing:2);

Z = X.*exp(-X.^2 - Y.^2);

[DX,DY,DZ] = gradient(Z,spacing);

quiver(X,Y,Z,DX,DY,DZ)

hold on

contour3(X,Y,Z)

axis equal

hold off

Answer 1

[KSSV]

spacing = 0.2;
[X,Y] = meshgrid(-2:spacing:2);
Z = X.*exp(-X.^2 - Y.^2);
[DX,DY] = gradient(Z);
quiver(X,Y,DX,DY)
hold on
contour(X,Y,Z)
axis equal
hold off

[John Omoruyi]

...thank u so much for replying.

I'm quite aware of this 2D solution, but actually more interested in the 3D implementation as I initially described. I'd be very greatful if you can help.