he relative error against the original position
      % vectors.
      %
      (rectan-pos) ./ pos

   MATLAB outputs:

      1.0e-14 *

                     0  -0.03701547067225   0.63783453323816
      0.02182376758148   0.01641520435413  -0.01531271963894
     -0.01912147275010  -0.04855217028457   0.02039513446643

      Example (2):

      %
      % Define eleven sets of spherical coordinates, 'lon' and 'colat'
      % expressed in degrees - converted to radians by use of <a href="cspice_rpd.html">cspi