add.scale.bar {ape} | R Documentation |
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.
add.scale.bar(x = 0, y = 1, length = NULL, ...)
x |
x location of the bar. |
y |
y location of the bar. |
length |
a numeric value giving the length of the scale bar. If none is supplied, a value is calculated from the data. |
... |
further arguments to be passed to text . |
As from version 1.4 of ape, the options of this function have been redefined, and have now default values. By default, the scale bar is plotted on the left bottom corner of the plot.
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.
Emmanuel Paradis paradis@isem.univ-montp2.fr
plot.phylo
, axisPhylo
,
locator
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, 2, 1))