pie {base}

R Documentation

Pie Charts

Description

Draw a pie chart.

Usage

pie(x, labels = names(x), edges = 200, radius = 0.8,
    density = NULL, angle = 45, col = NULL,
    main = NULL, ...)

Arguments

x	a vector of positive quantities. The values in x are displayed as the areas of pie slices.
labels	a vector of character strings giving names for the slices.
edges	the circular outline of the pie is approximated by a polygon with this many edges.
radius	the pie is drawn centered in a square box whose sides range from -1 to 1. If the character strings labeling the slices are long it may be necessary to use a smaller radius.
density	the density of shading lines, in lines per inch. The default value of NULL means that no shading lines are drawn. Non-positive values of ‘density’ also inhibit the drawing of shading lines.
angle	the slope of shading lines, given as an angle in degrees (counter-clockwise).
col	a vector of colors to be used in filling or shading the slices. If missing a set of 6 pastel colours is used, unless density is specified when par("fg") is used.
main	an overall title for the plot.
...	graphical parameters can be given as arguments to pie.

Note

Pie charts are a very bad way of displaying information. The eye is good at judging linear measures and bad at judging relative areas.

A bar chart or dot chart is a preferable way of displaying this type of data.

Prior to R 1.5.0 this was known as piechart, which is the name of a Trellis function, so the name was changed to be compatible with S.

See Also

dotchart.

Examples

pie(rep(1, 24), col = rainbow(24), radius = 0.9)

pie.sales <- c(0.12, 0.3, 0.26, 0.16, 0.04, 0.12)
names(pie.sales) <- c("Blueberry", "Cherry",
    "Apple", "Boston Cream", "Other", "Vanilla Cream")
pie(pie.sales) # default colours
pie(pie.sales,
    col = c("purple", "violetred1", "green3", "cornsilk", "cyan", "white"))
pie(pie.sales, col = gray(seq(0.4,1.0,length=6)))
pie(pie.sales, density = 10, angle = 15 + 10 * 1:6)

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