Functions to handle settings used by lattice. Their main purpose is to make code maintainance easier, and users normally should not need to use these functions. However, fine control at this level maybe useful in certain cases.
character giving the name of a setting
new options can be defined, or existing ones modified, using one or
more arguments of the form
These functions are modeled on
and behave similarly for the most part. Some of the available
components are documented here, but not all. The purpose of the ones
not documented are either fairly obvious, or not of interest to the
A function, or
NULL. If the former, every call to the
panel function will be wrapped inside
the specified function as an error handler. The default is to use
panel.error function. This prevents the plot
from failing due to errors in a single panel, and leaving the grid
operations in an unmanageable state. If set to
errors in panel functions will not be caught using
Logical flag indicating whether a
"trellis" object should
be saved when plotted for subsequent retrieval and further
manipulation. Defaults to
of the default space allocation in the grid layout created in the
course of plotting a
"trellis" object. Each named
component is a list of arguments to the grid function
units, and optionally
Usually not of interest to the end-user, who should instead use
the similiarly named component in the graphical settings,
A list of two components named
data, both logical flags. The flags
indicate whether the unused levels of factors (conditioning
variables and primary variables respectively) will be dropped,
which is usually relevant when a subsetting operation is performed
or an 'interaction' is created. See
xyplot for more
details. Note that this does not control dropping of levels of
the 'groups' argument.
A character string, either
determines the interpretation of
key (determining the legend; see
xyplot): either the full figure region ('"full"'),
or just the region that bounds the panels and strips ('"panel"').
A list giving default values for various
A list giving arguments to
gpar used to highlight a viewport chosen using
The banking function. See
List with components named
"factor", both scalar numbers.
Panel limits are extended by this amount, to provide padding
for numeric and factor scales respectively. The value for
numeric is multiplicative, whereas factor is additive.
Numeric scalar between 0 and 1. Tick marks that are too close to the limits are not drawn unless explicitly requested. The limits are contracted by this proportion, and anything outside is skipped.
The separator for creating
interactions with the extended formula interface (see
List determining default units for axis components. Should not be of interest to the end-user.
In addition, there is an option for the default prepanel and panel
function for each high-level function; e.g.,
xyplot. The options
for the others have similarly patterned names.
lattice.getOption returns the value of a single component,
lattice.options always returns a list with one or more
named components. When changing the values of components, the old
values of the modified components are returned by
lattice.options. If called without any arguments, the full
list is returned.
Deepayan Sarkar Deepayan.Sarkar@R-project.org