cylinder
Create cylinder
Description
[X,Y,Z] = cylinder returns the x-,
y-, and z- coordinates of a cylinder
without drawing it. The returned cylinder has a radius equal to
1, 20 equally spaced points around its circumference, and
bases parallel to the xy-plane.
The function returns the x-, y-, and
z- coordinates as three
21-by-21 matrices.
To draw the cylinder using the returned coordinates, use the
surf or mesh functions.
[X,Y,Z] = cylinder( returns the
x-, y-, and z-
coordinates of a cylinder with the specified profile curve,
r)r, and 20 equally spaced points around its
circumference. The function treats each element in r as a
radius at equally spaced heights along the unit height of the cylinder.
Examples
Display Unit Cylinder
Create and plot a cylinder with a radius equal to 1.
cylinder
Specify Cylinder Radius and Height
Specify the radius of a cylinder by including the input r. Then, specify the height of the cylinder by modifying the returned Z coordinate.
Define X, Y, and Z as coordinates of a cylinder with a radius of 4.
r = 4; [X,Y,Z] = cylinder(r);
Specify a height of 20 by modifying the Z coordinate. Plot the cylinder.
h = 20; Z = Z*h; surf(X,Y,Z)
Display Multiple Cylinders at Different Locations
Create a cylinder and use the returned coordinates to plot multiple cylinders in different locations.
Create a cylinder defined by the profile function 2 + cos(t).
t = 0:pi/10:2*pi; r = 2 + cos(t); [X,Y,Z] = cylinder(r);
Plot the cylinder with the base centered at the origin.
surf(X,Y,Z)
Plot two more cylinders on top of the first cylinder.
hold on
surf(X,Y,Z+1)
surf(X,Y,Z+2)