Description Usage Arguments Details Value Author(s) See Also Examples
Plots each species in a data frame against an environmental gradient using trellis graphics.
1 |
x |
Data frame with species data. |
grad |
Gradient vector. |
freq.limit |
Lowest frequency for species selected for plotting |
... |
Other parameters to |
Function plotGrad
is intended for preliminary inspection of
the data. It plots each species in a data frame against an
environmental gradient using Lattice
functions. If grad
is numeric, it uses scatter plots
(xyplot
) and if grad
is a factor, it
uses boxplots (bwplot
).
All species are plotted with equal vertical scale, making scarce
species very flat. Users can change this behaviour by transforming or
standardizing species data before analysis (for instance,
decostand
) has options "max"
for making all
species to equal scale).
The function uses trellis graphics in package lattice
, and
transfers all parameters to underlying functions
xyplot
and
bwplot
. Moreover, many graphical parameters can
be changed after producing the graph (see
trellis.par.set
).
Function returns a "trellis"
object.
Jari Oksanen
See Lattice
basics of Trellis graphics,
xyplot
and bwplot
for
underlying plotting functions, and trellis.par.set
for
setting graphical parameters.
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