"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,
xlim,
ylab,
ylim,
par.settings,
plot.args,
lattice.options,
index.cond,
perm.cond,
\dots)## S3 method for class 'trellis':
t(x)
## S3 method for class 'trellis':
[(x, i, j, \dots, drop = FALSE)
trellis.last.object(warn = TRUE, ...)
"trellis"
.FALSE
.object
. See details
below.trellis
, by default plotted by
print.trellis
. trellis.last.object
returns
NULL
is no saved object is available.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 (
The print method for "trellis"
objects optionally saves the
object after printing it. If this feature is enabled,
trellis.last.object
can retrieve it. Note that at most one
object can be saved at a time. If trellis.last.object
is called with arguments, these are used to update the retrieved
object before returning it.
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)
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