functions in hex.i - m

             make_sphere(radius, [imax,jmax,kmax],  
                         [phi1, phi2], [theta1, theta2])  
 
     return a mesh (see hex_mesh) representing the given section  
     of the sphere of given RADIUS.  IMAX, JMAX, and KMAX are the  
     number of nodes (cells+1) in the radial, longitude (phi), and  
     colatitude (theta) directions, respectively.  Note that for  
     a right handed coordinate system, phi1theta2.  
interpreted function, defined at i0/hex.i   line 432