R: Pie Charts

piechart {base} | R Documentation

## Pie Charts

### Description

Draw a pie chart.

### Usage

    piechart(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 the slices. If missing `par("bg")` 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 `piechart`.

### 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.

### See Also

`dotchart`.

### Examples

    piechart(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")
    piechart(pie.sales,
        col=c("purple", "violetred1", "green3",
        "cornsilk", "cyan", "white"))
    piechart(pie.sales,
        col=gray(seq(0.4,1.0,length=6)))
    piechart(pie.sales,
        density=10, angle=15+10*1:6)

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