Basic marker drawing primitive.

         POLYMARK is obsolete, but provided for upward compatibility from

         MATLAB 3.5.



  POLYMARK(X,Y) draws polymarkers at the X- and Y-coordinates

  in vectors X and Y.

  POLYMARK(X,Y,'type') uses the marker style and color

  indicated by the text string.  See PLOT3DFTRE7 for a list of

  style and color attributes.

  POLYMARK(X,Y,'sc') interprets X and Y in screen-coordinates

  where (0.0,0.0) is the lower-left corner of the screen and

  (1.0,1.0) is the upper-right corner.  Otherwise, data-

  coordinates are used.