| 
            plsym
          ( | n , | 
| x , | |
| y , | |
| code ); | 
      Plot a glyph at the specified points.  (This function is
      largely superseded by plstring which gives access to many[!]
      more glyphs.)
    
n
          (PLINT
            Number of points in the
            xy
x
          (PLFLT_VECTORA vector containing the x coordinates of the points.
y
          (PLFLT_VECTORA vector containing the y coordinates of the points.
code
          (PLINT
            Hershey symbol code corresponding to a glyph to be plotted
            at each of the 
               points.
          n
            
      Redacted form: plsym(x, y, code)
    
This function is used in example 7.