pca.legend: A Function to Automagically Place a Legend in a PCA Plot
Description
This function places a legend in a PCA plot depending on which corner is
available. If there are no available corners, user intervention will be
required. This is an internal function and not intended to be called by the
end user.
Usage
pca.legend(pca, groups, groupnames, pch.df, x.coord = NULL, y.coord = NULL, saveup = FALSE)
Arguments
groups
A vector of numbers indicating group membership
groupnames
A vector of names describing the different groups
pch.df
A numeric data.frame delineating the plotting symbols (column
1) and colors (column 2) to use
x.coord
X-coordinate for legend. Used if automatic placement will
fail
y.coord
Y-coordinate for legend. Used if automatic placement will
fail
saveup
Boolean: Save a small value for plotting additional text?
Value
This function returns nothing. It is used only for the side effect
of placing a legend in a plot.