| C_06_update.trellis {lattice} | R Documentation |
Update method for objects of class "trellis", and a way to retrieve
the last printed trellis object (that was saved).
## S3 method for class 'trellis'
update(object,
panel,
aspect,
as.table,
between,
key,
auto.key,
legend,
layout,
main,
page,
par.strip.text,
prepanel,
scales,
skip,
strip,
strip.left,
sub,
xlab,
ylab,
xlab.top,
ylab.right,
xlim,
ylim,
xscale.components,
yscale.components,
axis,
par.settings,
plot.args,
lattice.options,
index.cond,
perm.cond,
...)
## S3 method for class 'trellis'
t(x)
## S3 method for class 'trellis'
x[i, j, ..., drop = FALSE]
trellis.last.object(..., prefix)
object, x |
The object to be updated, of class |
i, j |
indices to be used. Names are not currently allowed. |
drop |
logical, whether dimensions with only one level are to be dropped.
Currently ignored, behaves as if it were |
panel, aspect, as.table, between, key, auto.key, legend, layout,
main, page, par.strip.text, prepanel, scales, skip, strip,
strip.left, sub, xlab, ylab, xlab.top, ylab.right, xlim, ylim,
xscale.components, yscale.components, axis, par.settings, plot.args,
lattice.options, index.cond, perm.cond, ... |
arguments that will be used to update |
prefix |
A character string acting as a prefix identifying the plot of a
|
All high level lattice functions such as xyplot produce an
object of (S3) class "trellis", which is usually displayed by its
print method. However, the object itself can be manipulated and
modified to a large extent using the update method, and then
re-displayed as needed.
Most arguments to high level functions can also be supplied to the
update method as well, with some exceptions. Generally
speaking, anything that would needs to change the data within each
panel is a no-no (this includes the formula, data, groups,
subscripts and subset). Everything else is technically game,
though might not be implemented yet. If you find something missing
that you wish to have, feel free to make a request.
Not all arguments accepted by a Lattice function are processed by
update, but the ones listed above should work. The purpose of
these arguments are described in the help page for
xyplot. Any other argument is added to the list of
arguments to be passed to the panel function. Because of their
somewhat special nature, updates to objects produced by cloud
and wireframe do not work very well yet.
The "[" method is a convenient shortcut for updating
index.cond. The t method is a convenient shortcut for
updating perm.cond in the special (but frequent) case where
there are exactly two conditioning variables, when it has the effect
of switching (‘transposing’) their order.
The print method for "trellis" objects optionally saves the
object after printing it. If this feature is enabled,
trellis.last.object can retrieve it. By default, the last
object plotted is retrieved, but if multiple objects are plotted on
the current page, then others can be retrieved using the appropriate
prefix argument. If trellis.last.object is
called with arguments, these are used to update the retrieved object
before returning it.
An object of class trellis, by default plotted by
print.trellis. trellis.last.object returns
NULL is no saved object is available.
Deepayan Sarkar Deepayan.Sarkar@R-project.org
trellis.object, Lattice,
xyplot
spots <- by(sunspots, gl(235, 12, labels = 1749:1983), mean)
old.options <- lattice.options(save.object = TRUE)
xyplot(spots ~ 1749:1983, xlab = "", type = "l",
scales = list(x = list(alternating = 2)),
main = "Average Yearly Sunspots")
update(trellis.last.object(), aspect = "xy")
trellis.last.object(xlab = "Year")
lattice.options(old.options)