plmatrix: Scatterplot Matrix
In regr0: Building regression models

Description Usage Arguments Details Value Author(s) See Also Examples

Plots a scatterplot matrix, for which the variables shown horizontally do not necessarily coincide with those shown vertically. If desired, the matrix is divided into several blocks such that it fills more than 1 plot page.

codepanelDefault is the function to be applied for each subplot, unless a different function is provided.

plmatrix(x, y = NULL, data = NULL, panel = panelDefault,
  nrow = 0, ncol = nrow, save = TRUE, robrange. = FALSE, range. = NULL,
  pch = 1, col = 1, reference = 0, ltyref = 3,
  log = "", xaxs = "r", yaxs = "r",
  xaxmar = NULL, yaxmar = NULL, xlabmar=NULL, ylabmar=NULL,
  vnames = NULL, main = "", xlab = NULL, ylab = NULL,
  cex = NA, cex.points = NA, cex.lab = 1, cex.text = 1.3, cex.title = 1,
  bty = "o", oma = NULL, mar = rep(0.2, 4), keeppar = FALSE,
  axes = TRUE, ...)  

panelDefault(xx, yy, indx, indy, pch=par("pch"), col=par("col"), 
  cex=par("cex"), size=NULL, ...)

panel.smooth(xx, yy, indx, indy, pch=par("pch"), col=par("col"),
  cex=par("cex"), ...)

`x`	data for columns (x axis), or formula defining column variables. If it is a formula containing a left hand side, the left side variables will be used last.
`y`	data or formula for rows (y axis). Defaults to `x`
`data`	data.frame containing the variables in case `x` or `y` is a formula
`panel`	a function that generates the marks of the individual panels, see Details. Defaults essentially to `points` or `text` depending on the argument `pch`, to `plmboxes` if 'x' is a factor and 'y' is not, or to a modification of `sunflowers` if both are factors.
`nrow`	number of rows of panels on a page
`ncol`	number of columns of panels on a page
`save`	if y is not provided and `save==TRUE`, the first row and the last column are suppressed.
`robrange.`	if TRUE, robust plot ranges will be used
`range.`	plot ranges, given as a matrix with 2 rows (min, max) and `colnames` identifying the variables.
`pch`	plotting character. A vector of integers, characters or strings can also be given for the default panel function
`col`	color(s) to be used for plotting the observations
`reference`	coordinates for reference lines to be shown in the panels. A named vector can be used to define a value for each or any variable.
`ltyref`	line type for reference lines
`log`	specifies logarithmic scale of axes. `"x"` asks for log scale on horizontal axis, `"y"`, on vertical axis, `"xy"`, on both axes.
`xaxs, yaxs`	styles for x and y axis, see `par`
`xaxmar, yaxmar`	in which margin should the x- [y-] axis be tick-marked?
`xlabmar, ylabmar`	in which margin should the x- [y-] axis be labelled?
`vnames`	labels for the variables
`main`	main title for the plot (to be repeated on each plot page)
`xlab, ylab`	vectors of labels for x- and y-axes, a string for each variable. This will override the `vnames` argument for the axis labels, but not for the diagonal panels.
`cex, cex.points`	character expansion for showing the observations (both arguments are equivalent, cex has priority).
`cex.lab, cex.text`	character expansion for variable labels in the margin and in the "diagonal", respectively, relative to `cex`
`cex.title`	character expansion for the main title
`bty`	box type for each panel, see `par`
`oma`	width of outer margins, ee `par`
`mar`	margins for the panels
`keeppar`	logical. If TRUE, the graphical settings "mfrow", "mar", "cex", and "mgp" will be maintained, otherwise, the old values will be restored (default).
`axes`	logical. If TRUE, axes will be drawn and labels shown (default).

...

further arguments passed to the panel function and possibly further to functions called by the panel function

Arguments for panelDefault and panel.smooth

`xx`	values of the horizontal variable
`yy`	values of the vertical variable
`indx`	index of the variable shown horizontally, among the `y` variables
`indy`	index of the variable shown horizontally, among the `y` variables

pch, colplotting character and color, as usual

size

size of sunflowers for plotting two factors

The panel function can be user written. It needs >=6 arguments which must correspond to the arguments of panelDefault, see above. If some arguments are not used, just introduce them as arguments to the function anyway in order to avoid (unnecessary) error messages and stops. The names pch and col must appear among the argument names.

panel.smooth only calls panel.smooth of the graphics package, absorbing the arguments that are needed but not used.

Since large scatterplot matrices lead to tiny panels, plmatrix splits the matrix into blocks of at most nrow rows and ncol columns. If these numbers are missing, they default to nrow=5 and ncol=6 for landscape pages, and to nrow=8 and ncol=5 for portrait pages.

none

Werner A. Stahel, ETH Zurich

pairs