## Bar Plots

## Usage

    barplot(height, width = 1, space = NULL, names.arg = NULL,
            legend.text = NULL, beside = FALSE, horiz = FALSE,
            col = heat.colors(NR), border = par("fg"), main = NULL,
            xlab = NULL, ylab = NULL, xlim = NULL, ylim = NULL,
            axes = TRUE, ...)

## Arguments

`height` | either a vector or matrix of values describing the bars which make up the plot. If `height` is a vector, the plot consists of a sequence of rectangular bars with heights given by the values in the vector. If `height` is a matrix and `beside` is `FALSE` then each bar of the plot corresponds to a column of `height`, with the values in the column giving the heights of stacked ``sub-bars'' making up the bar. If `height` is a matrix and `beside` is `TRUE`, then the values in each column are juxtaposed rather than stacked.
`width` | optional vector of bar widths.
`space` | the amount of space (as a fraction of the average bar width) left before each bar. May be given as a single number or one number per bar. If `height` is a matrix and `beside` is `TRUE`, `space` may be specified by two numbers, where the first is the space between bars in the same group, and the second the space between the groups. If not given explicitly, it defaults to `c(0,1)` if `height` is a matrix and `beside` is `TRUE`, and to 0.2 otherwise.
`names.arg` | a vector of names to be plotted below each bar or group of bars. If this argument is omitted, then the names are taken from the `names` attribute of `height` if this is a vector, or the column names of `height` if this is a matrix.
`legend.text` | a vector of text used to construct a legend for the plot. This is only useful when `height` is a matrix. In that case the legend labels should correspond to the rows of `height`.
`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 drwan horizontally with the first at the bottom.
`col` | a vector of colors for the bars or bar components.
`border` | the color to be used for the border of the bars.
`main` | an overall title for the plot.
`xlab` | a label for the x axis.
`ylab` | a label for the y axis.
`xlim` | limits for the x axis.
`ylim` | limits for the y axis.
`axes` | logical. If `TRUE`, a vertical axis is drawn.
`...` | further arguments are passed to `title(.)`.

## Value

A numeric vector, giving the coordinates of the bar midpoints drawn, useful for adding to the graph.

## See Also

`plot(...,type="h")`, `dotplot`, `hist`.

## Examples

    tN <- table(Ni <- rpois(100, lambda=5))
    r <- barplot(tN, col='gray')
    points(r, tN, type='h', col='red', lwd=2)#- type = "h" plotting *is* `bar'plot

    data(deaths, package = "base")
    mp <- barplot(deaths) # default
    tot <- apply(deaths,2,sum); text(mp, tot + 3, format(tot))
    barplot(deaths, beside = TRUE,
            col = c("lightblue", "mistyrose", "lightcyan",
                    "lavender", "cornsilk"),
            legend = rownames(deaths), ylim = c(0, 100))
    title(main = "Death Rates in Virginia", font.main = 4)

    barplot(t(deaths)[, 5:1], beside = TRUE,
            col = c("lightblue", "mistyrose",
                    "lightcyan", "lavender"),
            legend = colnames(deaths), ylim = c(0,80),
            main = "Death Rates in Virginia", font.main = 4)
            ## instead of title(.)

[Package Contents]