Place Value Labels on a Barplot
Place text either in the middle of the stacked bars of a barplot or on top of a side by side barplot.
BarText(height, b, labels = height, beside = FALSE, horiz = FALSE,
cex = par("cex"), adj = NULL,
pos = c("topout", "topin", "mid", "bottomin", "bottomout"),
offset = 0, ...)height |
either a vector or matrix of values describing the bars which make up the plot exactly as used for creating the barplot. |
b |
the returned mid points as returned by |
labels |
the labels to be placed on the bars. |
beside |
a logical value. If FALSE, the columns of height are portrayed as stacked bars, and if TRUE the columns are portrayed as juxtaposed bars. |
horiz |
a logical value. If FALSE, the bars are drawn vertically with the first bar to the left. If TRUE, the bars are drawn horizontally with the first at the bottom. |
cex |
numeric character expansion factor; multiplied by |
adj |
one or two values in [0, 1] which specify the x (and optionally y) adjustment of the labels. On most devices values outside that interval will also work. |
pos |
one of |
offset |
a vector indicating how much the bars should be shifted relative to the x axis. |
... |
the dots are passed to the |
It sometimes makes sense to place the data values directly on the bars. The x coordinates of the labels can be found by using barplot() result, if they are to be centered at the top of each bar. BarText() calculates the rest.
Notice that when the labels are placed on top of the bars, they may be clipped. This can be avoided by setting xpd=TRUE.
returns the geometry of the labels invisibly
Andri Signorell <andri@signorell.net>
# simple vector
x <- c(453, 44, 56, 34)
b <- barplot(x)
BarText(x, b, x)
# more complicated
b <- barplot(VADeaths, horiz = FALSE, col=hblue, beside = TRUE)
BarText(VADeaths, b=b, horiz = FALSE, beside = TRUE, cex=0.8)
BarText(VADeaths, b=b, horiz = FALSE, beside = TRUE, cex=0.8, pos="bottomin",
col="white", font=2)
b <- barplot(VADeaths, horiz = TRUE, col=hblue, beside = TRUE)
BarText(VADeaths, b=b, horiz = TRUE, beside = TRUE, cex=0.8)
b <- barplot(VADeaths)
BarText(VADeaths, b=b)
b <- barplot(VADeaths, horiz = TRUE)
BarText(VADeaths, b=b, horiz = TRUE, col="red", cex=1.5)
# position of the text
par(mfrow=c(3,2))
off <- c(10, 4, 1, 20, -15)
for(pos in eval(formals(BarText)$pos)) {
b <- barplot(x, offset=off,
main=gettextf("Textposition pos = '%s'", pos), horiz=TRUE)
abline(h=0)
BarText(x, b, x, offset = off, pos=pos, cex=1.5, horiz=TRUE)
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.