Add Reference Grid to Panels
USAGE:
panel.grid(h = 3, v = 3)
ARGUMENTS:
- h
-
the number of horizontal reference lines which evenly divide the panel.
If
h
is
0
, no horizontal reference lines will be drawn.
If
h
is negative, there will be horizontal lines that align
with the horizontal tick marks.
- v
-
the number of vertical reference lines which evenly divide the panel.
If
v
is
0
, no vertical reference lines will be drawn.
If
v
is negative, there will be vertical lines that align
with the vertical tick marks.
- ...
-
graphical parameters may be supplied to control the reference lines.
By default, values of parameters
lwd
,
lty
, and
col
are
used from object
reference.line
.
SIDE EFFECTS:
The function adds horizontal and/or vertical reference lines to a plot.
EXAMPLES:
panel.grid(h = -1, v = -1) # grid aligned with tick marks