XGobi: Dynamic Graphics for Data Analysis

Usage

xgobi(matrx,
collab=NULL, rowlab=NULL,
colors=NULL, glyphs=NULL, erase=NULL,
lines=NULL, linecolors=NULL,
resources=NULL, title=NULL,
vgroups=NULL, std="mmx", dev=2.0,
nlinkable=0, subset=NULL,
display=NULL)

Arguments

matrx Any numeric matrix or data.frame.
collab Optional character vector of column labels; the default is dimnames(matrx)[[2]]. If no default exists, xgobi constructs its own defaults.
rowlab Optional character vector of row labels; the default is dimnames(matrx)[[1]]. If no default exists, xgobi constructs its own defaults.
colors Optional character vector, used to supply initial point colors to be used; the default is that all points are the same color.
glyphs Optional integer vector, used to supply glyphs to be used on startup; the default is that all points are drawn with the same glyph.
erase Optional integer vector of length equal to the number of rows in the data and composed of 1s and 0s. A 1 in position i specifies that point i should be erased. The default is a vector of 0s.
lines Optional integer matrix, n by 2, which specifies by row number pairs of points to be connected by line segments. The default connecting line matrix connects each point to the one that follows it in the data; that is, (1 2), (2 3), (3 4), ...{}, (n-1, n).
linecolors Optional integer vector, of length n where n is the number of lines specified by the 'lines' argument. It is used to supply line colors to be used on startup; the default is for all the lines to be drawn in the standard foreground color.
resources Optional character vector created by clicking on the "Save Resources" button in XGobi (if this XGobi was initiated during an S session).
title Optional character string which defines the -title argument used by X. The default is the name of the current matrix matrx. See documentation for xgobi, or for X.
vgroups Optional integer vector, used to assign columns to groups for transformation and axis scaling. This vector must contain one integer for each variable. Columns to be grouped together should share the same integer. Default is the vector 1:(ncol(matrx)).
std Optional string; which standardization of view to use. Default is "mmx", minimum-maximum scaling, in which the view is centered at the midpoint of the data, and all the data fits inside the plotting window. Alternatives are "msd", in which the plot is centered at the mean of the data and dev standard deviations fit inside the plotting region, or "mmd" in which the plot is centered at the median and dev median absolute deviations are shown inside the plotting window.
dev Optional numeric scalar; the number of standard deviations (if "msd" is chosen) or median absolute deviations (if "mmd" is chosen) that will be plotted inside the plotting window. Default is 2.
nlinkable Optional integer scalar, the number of rows to be used in linking of brushing and identification; the default is for all rows to be used. This feature can be used to link ordinary scatterplots with plots that have some decorations requiring additional points, such as clustering trees.
subset Optional integer scalar, the number of rows to be included in the initial display. That is, all data will be read in, but an initial random sample will be drawn for display. Use the Subset panel on the Tools Menu to select a new subset during the session.
display Optional character string, identifying the monitor on which to display the xgobi window. The default is "machine:0.0" where machine is the name of the user's workstation. See documentation for xgobi or for X.

Description

Dynamic graphics, including brushing, rotation, grand tour, projection pursuit, slicing. Most effectively used when called more than once on same data, which then allows linked plots. Brushing with several glyphs and colors is supported. (On monochrome displays, only glyphs can be used.)

Value

The UNIX status upon completion, i.e. 0 if ok.

Side Effects

The xgobi S function executes a call to the C program of the same name, an interactive statistical graphics program which runs under the X Window System, and returns control of the S shell to the user.

XGobi can be used to create vectors of brushing information and rotation coefficients; see the documentation for XGobi for details.

CONTACT

D. F. Swayne dfs@research.att.com

References

http://www.research.att.com/areas/stat/xgobi/ http://www.public.iastate.edu/~dicook/

Examples

data(laser)
xgobi(laser)


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