How to use meshgrid and contour

x=-2*pi:pi/100:2*pi;
y=-2*pi:pi/100:2*pi;
[X,Y]=meshgrid(x,y);
Z=(sin(2*X).^2)+(cos(2*Y).^2);
figure
contour3(X,Y,Z)

[Sarah Hicks]

The plot is not working for some reason. Any help would be greatly appreciated.

Answer 1

[Star Strider]

I don’t know what you mean by ‘not working’.

This (slighty variation on your posted code) works, and shows the contour3 lines on the mesh plot surface:

x=-2*pi:pi/100:2*pi;
y=-2*pi:pi/100:2*pi;
[X,Y]=meshgrid(x,y);
Z=(sin(2*X).^2)+(cos(2*Y).^2);
figure
mesh(X,Y,Z)
hold on
contour3(X,Y,Z, 'r', 'LineWidth',1)
hold off
grid on

What result do you want if it’s other than this?