How can I plot
cos(x) + cos(y) + cos(z) = 0
In 3D plane (the expected 3D model is attached )
and I also want to know how to put my own contour on the surface
MATLAB: How to plot cos(x) + cos(y) + cos(z) = 0
3d plotscontoursurface
Related Solutions
You have two surfaces:
theta = linspace(0,2*pi,30);phi = linspace(0,pi/2,30);[theta,phi] = meshgrid(theta,phi);r = 3;[x,y] = sph2cart(theta,phi,r);z_sphere = sqrt(9-x.^2-y.^2);z_cone = sqrt(x.^2+y.^2);%remove all complex elements
z_sphere(imag(z_sphere)>eps)=NaN;z_sphere=real(z_sphere);They share the same coordinate grid, so now we can do element-wise operations. You need to remove points where z_sphere is higher than z_cone. The easiest way to remove points without messing up the coordinate grid is by marking them with NaN:
z_sphere( z_sphere>z_cone ) = NaN;surf(x,y,z_cone,'FaceAlpha',0.3),hold on % optional line
surf(x,y,z_sphere)view(45,45)
I’m not sure what you want.
This works:
x = linspace(0, 5, 150);y = 0.05*x + 2.01;p = 3*sin(x).^2+2*cos(y).^3;q = 3*cos(x.*y)+2*y.^2;r = p + q;plot(x, r)gridEDIT — Edited to incorporate the later definition of ‘y’.
Best Answer