(octave.info)Three-dimensional Geometric Shapes

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15.2.2.3 Three-dimensional Geometric Shapes
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 -- : cylinder
 -- : cylinder (R)
 -- : cylinder (R, N)
 -- : cylinder (HAX, ...)
 -- : [X, Y, Z] = cylinder (...)
     Plot a 3-D unit cylinder.

     The optional input R is a vector specifying the radius along the
     unit z-axis.  The default is [1 1] indicating radius 1 at ‘Z == 0’
     and at ‘Z == 1’.

     The optional input N determines the number of faces around the
     circumference of the cylinder.  The default value is 20.

     If the first argument HAX is an axes handle, then plot into this
     axes, rather than the current axes returned by ‘gca’.

     If outputs are requested ‘cylinder’ returns three matrices in
     ‘meshgrid’ format, such that ‘surf (X, Y, Z)’ generates a unit
     cylinder.

     Example:

          [x, y, z] = cylinder (10:-1:0, 50);
          surf (x, y, z);
          title ("a cone");

     See also: Note: ellipsoid, *note rectangle:
     XREFrectangle, Note: sphere.

 -- : sphere ()
 -- : sphere (N)
 -- : sphere (HAX, ...)
 -- : [X, Y, Z] = sphere (...)
     Plot a 3-D unit sphere.

     The optional input N determines the number of faces around the
     circumference of the sphere.  The default value is 20.

     If the first argument HAX is an axes handle, then plot into this
     axes, rather than the current axes returned by ‘gca’.

     If outputs are requested ‘sphere’ returns three matrices in
     ‘meshgrid’ format such that ‘surf (X, Y, Z)’ generates a unit
     sphere.

     Example:

          [x, y, z] = sphere (40);
          surf (3*x, 3*y, 3*z);
          axis equal;
          title ("sphere of radius 3");

     See also: Note: cylinder, *note ellipsoid:
     XREFellipsoid, Note: rectangle.

 -- : ellipsoid (XC, YC, ZC, XR, YR, ZR, N)
 -- : ellipsoid (..., N)
 -- : ellipsoid (HAX, ...)
 -- : [X, Y, Z] = ellipsoid (...)
     Plot a 3-D ellipsoid.

     The inputs XC, YC, ZC specify the center of the ellipsoid.  The
     inputs XR, YR, ZR specify the semi-major axis lengths.

     The optional input N determines the number of faces around the
     circumference of the cylinder.  The default value is 20.

     If the first argument HAX is an axes handle, then plot into this
     axes, rather than the current axes returned by ‘gca’.

     If outputs are requested ‘ellipsoid’ returns three matrices in
     ‘meshgrid’ format, such that ‘surf (X, Y, Z)’ generates the
     ellipsoid.

     See also: Note: cylinder, *note rectangle:
     XREFrectangle, Note: sphere.