Description Usage Arguments Details Value Author(s) See Also Examples
Draws a PCA biplot with species scores indicated by biplot arrows
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x |
A |
choices |
Axes to show. |
scaling |
Scaling for species and site scores. Either species
( The type of scores can also be specified as one of |
correlation |
logical; if |
display |
Scores shown. These must some of the alternatives
|
type |
Type of plot: partial match to |
xlim, ylim |
the x and y limits (min, max) of the plot. |
col |
Colours used for sites and species (in this order). If only one colour is given, it is used for both. |
const |
General scaling constant for |
... |
Other parameters for plotting functions. |
Produces a plot or biplot of the results of a call to
rda
. It is common for the "species" scores in a PCA to
be drawn as biplot arrows that point in the direction of increasing
values for that variable. The biplot.rda
function provides a
wrapper to plot.cca
to allow the easy production of such a
plot.
biplot.rda
is only suitable for unconstrained models. If
used on an ordination object with constraints, an error is issued.
If species scores are drawn using "text"
, the arrows are drawn
from the origin to 0.85 * species score, whilst the labels are
drawn at the species score. If the type used is "points"
, then
no labels are drawn and therefore the arrows are drawn from the origin
to the actual species score.
The plot
function returns invisibly a plotting structure which
can be used by identify.ordiplot
to identify
the points or other functions in the ordiplot
family.
Gavin Simpson, based on plot.cca
by Jari Oksanen.
plot.cca
, rda
for something to
plot, ordiplot
for an alternative plotting routine
and more support functions, and text
,
points
and arrows
for the basic routines.
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