splom {lattice}  R Documentation 
Draw Conditional Scatter Plot Matrices and Parallel Coordinate Plots
splom(x, data, ...) parallel(x, data, ...) ## S3 method for class 'formula': splom(x, data, auto.key = FALSE, aspect = 1, between = list(x = 0.5, y = 0.5), panel = lattice.getOption("panel.splom"), prepanel, scales, strip, groups, xlab, xlim, ylab = NULL, ylim, superpanel = lattice.getOption("panel.pairs"), pscales = 5, varnames, drop.unused.levels, ..., lattice.options = NULL, default.scales, subset = TRUE) ## S3 method for class 'formula': parallel(x, data, aspect = "fill", between = list(x = 0.5, y = 0.5), panel = lattice.getOption("panel.parallel"), prepanel, scales, strip, groups, xlab = NULL, xlim, ylab = NULL, ylim, varnames, drop.unused.levels, ..., lattice.options = NULL, default.scales, subset = TRUE) ## S3 method for class 'data.frame': splom(x, data = NULL, ...) ## S3 method for class 'matrix': splom(x, data = NULL, ...) ## S3 method for class 'matrix': parallel(x, data = NULL, ...) ## S3 method for class 'data.frame': parallel(x, data = NULL, ...)
x 
The object on which method dispatch is carried out.
For the "formula" method, a formula describing the structure
of the plot, which should be of the form ~ x  g1 * g2 *
... , where x is a data frame or matrix. Each of
g1,g2,... must be either factors or shingles. The
conditioning variables g1, g2, ... may be omitted.
For the data.frame methods, a data frame.

data 
For the formula methods, an optional data frame in which
variables in the formula (as well as groups and
subset , if any) are to be evaluated.

aspect 
aspect ratio of each panel (and subpanel), square by default for
splom .

between 
to avoid confusion between panels and subpanels, the default is to show the panels of a splom plot with space between them. 
panel 
Usual interpretation for parallel , namely the function that
creates the display within each panel.
For splom , the terminology is slightly complicated. The role
played by the panel function in most other highlevel functions is
played here by the superpanel function, which is responsible
for the display for each conditional data subset. panel is
simply an argument to the default superpanel function
panel.pairs , and is passed on to it unchanged. It is used
there to create each pairwise display. See panel.pairs
for more useful options.

superpanel 
function that sets up the splom display, by default as a scatterplot matrix. 
pscales 
a numeric value or a list, meant to be a less functional substitute
for the scales argument in xyplot etc. This argument
is passed to the superpanel function, and is handled by the
default superpanel function panel.pairs . The help page for
the latter documents this argument in more detail.

varnames 
character vector giving the names of the p variables in x. By default, the column names of x. 
auto.key, prepanel, scales,
strip, groups, xlab, xlim, ylab, ylim, drop.unused.levels,
lattice.options, default.scales, subset 
See xyplot 
... 
Further arguments. See corresponding entry in
xyplot for nontrivial details. 
splom
produces Scatter Plot Matrices. The role usually played by
panel
is taken over by superpanel
, which determines how
the columns of x
are to be arranged for pairwise plots. The
only available option currently is panel.pairs
.
Many of the finer customizations usually done via arguments to high
level function like xyplot
are instead done by
panel.pairs
for splom
. These include control of axis
limits, tick locations and prepanel calcultions. If you are trying to
finetune your splom
plot, definitely look at the
panel.pairs
help page. The scales
argument is
usually not very useful in splom
, and trying to change it may
have undesired effects.
parallel
draws Parallel Coordinate Plots. (Difficult to
describe, see example.)
These and all other high level Trellis functions have several
arguments in common. These are extensively documented only in the
help page for xyplot
, which should be consulted to learn more
detailed usage.
An object of class "trellis"
. The
update
method can be used to
update components of the object and the
print
method (usually called by
default) will plot it on an appropriate plotting device.
Deepayan Sarkar Deepayan.Sarkar@Rproject.org
super.sym < trellis.par.get("superpose.symbol") splom(~iris[1:4], groups = Species, data = iris, panel = panel.superpose, key = list(title = "Three Varieties of Iris", columns = 3, points = list(pch = super.sym$pch[1:3], col = super.sym$col[1:3]), text = list(c("Setosa", "Versicolor", "Virginica")))) splom(~iris[1:3]Species, data = iris, layout=c(2,2), pscales = 0, varnames = c("Sepal\nLength", "Sepal\nWidth", "Petal\nLength"), page = function(...) { ltext(x = seq(.6, .8, len = 4), y = seq(.9, .6, len = 4), lab = c("Three", "Varieties", "of", "Iris"), cex = 2) }) parallel(~iris[1:4]  Species, iris)