Using a vector to plot a cylinder

Good day,

I am trying to create a cylinder using the 6 data point in the figure provided. The current code is listed below. I am not certain if I am using the correct cylinder syntax. If you could please provided any assistance it would be greatly appreciated. Thank you.

[Z,X,Y] = cylinder(0.0191/2, 100);
rodLen = norm(rodPoints(6,:)-rodPoints(1,:));
surf(X,rodLen*Y,Z,...
    'EdgeColor', 'none',...
    'FaceColor', [0.7 0.7 0.7],...
    'FaceAlpha', 0.2)

[Javier Coves Toral]

Probably I arrive late, but I think I was trying to do something similar to you and I found this question. Finally I managed to do what I was triying so I am leaving my code here in case it is helpful to anyone :)

This creates a cylinder centered at (0,0,0), with its direction being the one of the vector "cyl_vect", with its radious being "R", and with its length being "l".

cyl_vect = [1,3,2];
R = 6378.137;
l = 100000;
[x,y,z] = cylinder(R);
th = atand(cyl_vect(3)/sqrt(cyl_vect(1)^2 + cyl_vect(2)^2));
if cyl_vect(1)>=0
    phi = atand(cyl_vect(2)/cyl_vect(1));
else
    phi = 180 + atand(cyl_vect(2)/cyl_vect(1));
end
surf(l*z*cosd(th)*cosd(phi)-x*sind(phi)-y*sind(th)*cosd(phi),l*z*cosd(th)*sind(phi)+x*cosd(phi)-y*sind(th)*sind(phi),l*z*sind(th)+y*cosd(th));

[darova]

See rotate function

[Charles Rice]

See also atan2d function that does what your if/else statement does.

Answer 1

[Hari Krishna Ravuri]

I understand that you are trying to make a surface plot of a cylinder. One of the ways in which you can use cylinder() is

[X,Y,Z] = cylinder(r,n) 

This returns x,y,z coordinates of a cylinder based on the parameters. In you script, I observed that, the cylinder’s x,y,z coordinates are being stored in z,x,y . You are trying to modify the y coordinates of the cylinder, which changes the shape of it. Please refer https://www.mathworks.com/help/matlab/ref/cylinder.html