title {base}R Documentation

Plot Annotation

Description

This function can be used to add labels to a plot. Its first four principal arguments can also be used as arguments in most high-level plotting functions. They must be of type character or expression. In the latter case, quite a bit of mathematical notation is available such as sub- and superscripts, greek letters, fractions, etc.

Usage

title(main = "", sub = "", xlab = "", ylab = "", ...)

Arguments

main The main title (on top) using font and size (character expansion) par("font.main") and color par("col.main").
sub Sub-title (at bottom) using font and size par("font.sub") and color par("col.sub").
xlab X axis label using font and character expansion par("font.axis") and color par("col.axis").
ylab Y axis label, same font attributes as xlab.
... further graphical parameters (from par).

See Also

mtext, text; plotmath for details on mathematical annotation.

Examples


plot(cars, main = "")
title(main = "Stopping Distance versus Speed")

x <- seq(-4, 4, len = 101)
y <- cbind(sin(x), cos(x))
matplot(x, y, type = "l", xaxt = "n",
        main = expression(paste(plain(sin) * phi, "  and  ",
                                plain(cos) * phi)),
        ylab = expression("sin" * phi, "cos" * phi), # only 1st is taken
        xlab = expression(paste("Phase Angle ", phi)),
        col.main = "blue")
axis(1, at = c(-pi, -pi/2, 0, pi/2, pi),
     lab = expression(-pi, -pi/2, 0, pi/2, pi))
abline(h = 0, v = pi/2 * c(-1,1), lty = 2, lwd = .1, col = "gray70")
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