要范围[-2,2]x[-2,2]x[-2,x]的~谢谢~~
x=-2:0.1:2;
y=x;
[x,y]=meshgrid(x,y);
z=x.*y;
surf(x,y,z);
grid on;
xlabel('x.axis');
ylabel('y.axis');
zlabel('z.axis');
title('z=xy');