| plot.default {graphics} | R Documentation |
Draw a scatter plot with decorations such as axes and titles in the active graphics window.
## Default S3 method:
plot(x, y = NULL, type = "p", xlim = NULL, ylim = NULL,
log = "", main = NULL, sub = NULL, xlab = NULL, ylab = NULL,
ann = par("ann"), axes = TRUE, frame.plot = axes,
panel.first = NULL, panel.last = NULL, asp = NA, ...)
x, y |
the x and y arguments provide the x and y
coordinates for the plot. Any reasonable way of defining the
coordinates is acceptable. See the function xy.coords
for details. If supplied separately, they must be of the same length. |
type |
1-character string giving the type of plot desired. The
following values are possible, for details, see plot:
"p" for points, "l" for lines,
"o" for overplotted points and lines,
"b", "c") for (empty if "c") points joined by lines,
"s" and "S" for stair steps and
"h" for histogram-like vertical lines. Finally,
"n" does not produce any points or lines. |
xlim |
the x limits (x1, x2) of the plot. Note that x1 > x2
is allowed and leads to a ‘reversed axis’. |
ylim |
the y limits of the plot. |
log |
a character string which contains "x" if the x axis
is to be logarithmic, "y" if the y axis is to be logarithmic
and "xy" or "yx" if both axes are to be logarithmic. |
main |
a main title for the plot, see also title. |
sub |
a sub title for the plot. |
xlab |
a label for the x axis, defaults to a description of x. |
ylab |
a label for the y axis, defaults to a description of y. |
ann |
a logical value indicating whether the default annotation (title and x and y axis labels) should appear on the plot. |
axes |
a logical value indicating whether both axes should be drawn on
the plot. Use graphical parameter "xaxt" or "yaxt"
to suppress just one of the axes. |
frame.plot |
a logical indicating whether a box should be drawn around the plot. |
panel.first |
an expression to be evaluated after the plot axes are set up but before any plotting takes place. This can be useful for drawing background grids or scatterplot smooths. |
panel.last |
an expression to be evaluated after plotting has taken place. |
asp |
the y/x aspect ratio, see plot.window. |
... |
other graphical parameters (see par and
section ‘Details’ below). |
Commonly used graphical parameters are:
colbgpoints. Note: this is not the same setting
as par("bg").pchpoints.cexpar("cex").
NULL and NA are equivalent to 1.0. Note that
this does not affect annotation: see below.ltypar.cex.main, col.lab, font.sub, etctitle and
par.lwdpar.Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
Cleveland, W. S. (1985) The Elements of Graphing Data. Monterey, CA: Wadsworth.
Murrell, P. (2005) R Graphics. Chapman & Hall/CRC Press.
Speed <- cars$speed
Distance <- cars$dist
plot(Speed, Distance, panel.first = grid(8,8),
pch = 0, cex = 1.2, col = "blue")
plot(Speed, Distance,
panel.first = lines(stats::lowess(Speed, Distance), lty = "dashed"),
pch = 0, cex = 1.2, col = "blue")
## Show the different plot types
x <- 0:12
y <- sin(pi/5 * x)
op <- par(mfrow = c(3,3), mar = .1+ c(2,2,3,1))
for (tp in c("p","l","b", "c","o","h", "s","S","n")) {
plot(y ~ x, type = tp,
main = paste("plot(*, type = \"",tp,"\")",sep=""))
if(tp == "S") {
lines(x,y, type = "s", col = "red", lty = 2)
mtext("lines(*, type = \"s\", ...)", col = "red", cex=.8)
}
}
par(op)
##--- Log-Log Plot with custom axes
lx <- seq(1,5, length=41)
yl <- expression(e^{-frac(1,2) * {log[10](x)}^2})
y <- exp(-.5*lx^2)
op <- par(mfrow=c(2,1), mar=par("mar")+c(0,1,0,0))
plot(10^lx, y, log="xy", type="l", col="purple",
main="Log-Log plot", ylab=yl, xlab="x")
plot(10^lx, y, log="xy", type="o", pch='.', col="forestgreen",
main="Log-Log plot with custom axes", ylab=yl, xlab="x",
axes = FALSE, frame.plot = TRUE)
my.at <- 10^(1:5)
axis(1, at = my.at, labels = formatC(my.at, format="fg"))
at.y <- 10^(-5:-1)
axis(2, at = at.y, labels = formatC(at.y, format="fg"), col.axis="red")
par(op)