COMPASS(Z) draws a graph that displays the angle and magnitude
of the complex elements of Z as arrows emanating from the origin.
COMPASS(X,Y) is equivalent to COMPASS(X+i*Y). It displays the
compass plot for the angles and magnitudes of the elements of
matrices X and Y.
COMPASS(Z,'S') and COMPASS(X,Y,'S') use line style 'S' where
'S' is any legal linetype as described under the PLOT command.
See also ROSE1DY4DU2, FEATHER , QUIVER .