## Pie Charts

## Usage

    piechart(x, labels=names(x), shadow=FALSE,
            edges=200, radius=0.8, fill=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.
`shadow` | a logical vector indicating whether a shadow effect should be attempted for the chart. This only makes sense if the slices are filled with colors.
`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.
`col` | a vector of colors to be used in filling the slices.
`main` | an overall title for the plot.
`...` | graphical parameters can be given as arguments to `piechart`.

## Description

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

`dotplot`.

## 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)))

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