
plstripa: Add a point to a strip chart 

DESCRIPTION:

    This function is used in example 17. 

SYNOPSIS:

plstripa(id, pen, x, y)

ARGUMENTS:

    id (PLINT, input) :    Identification number of the strip chart (set
    up in plstripc). 

    pen (PLINT, input) :    Pen number (ranges from 0 to 3). 

    x (PLFLT, input) :      X coordinate of point to plot. 

    y (PLFLT, input) :      Y coordinate of point to plot. 
