.BG
.FN lines
.FN points
.TL
Add Lines or Points to Current Plot
.CS
lines(x, y, type="l")
points(x, y, type="p")
.XY
.NA
.AG type=
values of "p", "l", "b", "o", "n", and "h" produce points,
lines, both, both (overlaid), nothing, and high-density lines.
.GR
The graphical parameter `pch=' can be used
to plot special symbols at the points.
Basic marks are: square (0); octagon (1); triangle (2);
cross (3); X (4); diamond (5) and inverted triangle (6). To get
superimposed versions of the above use the following
arithmetic(!): 7==0+4; 8==3+4; 9==3+5; 10==1+3; 11==2+6;
12==0+3; 13==1+4; 14==0+2.
Filled marks are square (15), octagon (16), triangle (17),
and diamond (18).
.PP
Data values with an `NA' in either `x' or `y' are not plotted by
`points'.
Also, `lines' does not draw to or from any such point, thus giving
a break in the line segments.
.PP
If a log scale is currently in effect for either
the x- or y-axis, `points' and
`lines' will plot the corresponding values on a log scale.
.SA
`segments', `arrows', and `symbols'.
.EX
par(usr=c(-1,19,0,1))	# produce a plot of all the marks
for(i in 0:18) {
      points(i, .5, pch=i); text(i, .35, i) }
text(9, .75, 'Samples of "pch=" Parameter')
.PI 1.5i
.KW aplot
.WR
