ordilabel: Add Text on Non-transparent Label to an Ordination Plot.

In vegandevs/vegan: Community Ecology Package

Add Text on Non-transparent Label to an Ordination Plot.

Description

Function ordilabel is similar to text, but the text is on an opaque label. This can help in crowded ordination plots: you still cannot see all text labels, but at least the uppermost ones are readable. Argument priority helps to make the most important labels visible. Function can be used in pipe after ordination plot or ordiplot command.

Usage

ordilabel(x, display, labels, choices = c(1, 2), priority, select,
    cex = 0.8, fill = "white", border = NULL, col = NULL, xpd = TRUE, ...)

Arguments

x	An ordination object an any object known to scores.
display	Kind of scores displayed (passed to scores).
labels	Optional text used in plots instead of the default. If this is given, these labels are also used in select.
choices	Axes shown (passed to scores).
priority	Vector of the same length as the number of labels. The items with high priority will be plotted uppermost.
select	Items to be displayed. This can either be a logical vector which is TRUE for displayed items or a vector of indices of displayed items.
cex	Character expansion for the text (passed to text).
fill	Background colour of the labels (the col argument of polygon).
border	The colour and visibility of the border of the label as defined in polygon. The default is to use text colour col.
col	Text colour.
xpd	Draw labels also outside the plot region.
...	Other arguments (passed to text).

Details

The function may be useful with crowded ordination plots, in particular together with argument priority. You will not see all text labels, but at least some are readable. Function can be used as a part of a pipe (|>) in place of text after an ordination plot command (see Examples).

Other alternatives for cluttered plots are identify.ordiplot, orditorp, ordipointlabel and orditkplot (in vegan3d package).

Author(s)

Jari Oksanen

See Also

plot.cca and text.ordiplot that can use the function with argument bg.

Examples

data(dune)
ord <- cca(dune)
plot(ord, type = "n")
## add text
ordilabel(ord, dis="sites", cex=1.2, font=3, fill="hotpink", col="blue")
## You may prefer separate plots, but here species as well
ordilabel(ord, dis="sp", font=2, priority=colSums(dune))
## use in a pipe
plot(ord, type = "n") |>
   ordilabel("spec", font = 3, priority = colSums(dune)) |>
   points("sites", pch=21, bg = "yellow", col = "blue")

vegandevs/vegan documentation built on April 13, 2025, 6:54 p.m.