Create cylinder

`[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
`r`

)*x*-, *y*-, and *z*-
coordinates of a cylinder with the specified profile curve,
`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.