ape (version 3.0-1)

add.scale.bar: Add a Scale Bar to a Phylogeny Plot

Description

This function adds a horizontal bar giving the scale of the branch lengths to a plot of a phylogenetic tree on the current graphical device.

Usage

add.scale.bar(x, y, length = NULL, ask = FALSE,
              lwd = 1, lcol = "black", ...)

Details

By default, the bar is placed in a corner of the graph depending on the direction of the tree. Otherwise both x and y must be specified (if only one is given it is ignored).

The further arguments (...) are used to format the text. They may be font, cex, col, and so on (see examples below, and the help page on text).

The function locator may be used to determine the x and y arguments.

See Also

plot.phylo, axisPhylo, locator

Examples

tr <- rtree(10)
layout(matrix(1:2, 2, 1))
plot(tr)
add.scale.bar()
plot(tr)
add.scale.bar(cex = 0.7, font = 2, col = "red")
layout(matrix(1))