Options Settings

Usage

options(...)
.Options

Arguments

... any options can be defined, using name = value. However, only the ones below are used in ``base R''.

Further, options('name') == options()['name'], see the example.

prompt a string, used for R's prompt; should usually end in a blank (" ").
continue a string setting the prompt used for lines which continue over one line.
width controls the number of characters on a line. You may want to change this if you resize the window that R is running in.
digits controls the number of digits to print when printing numeric values. It is a suggestion only.
editor sets the default text editor, e.g., for edit.
browser default HTML browser used by help.start().
contrasts the default contrasts used in model fitting such as with aov or lm.
expressions sets a limit on the number of nested expressions that will be evaluated. This is especially important on the Macintosh since stack overflow is likely if this is set too high.
na.action the name of a function for treating missing values (NA's) for certain situations.
pager the (standalone) program used for displaying ASCII files on R's console. Defaults to `$RHOME/bin/pager'.
papersize the paper format used for graphics printing; currently read-only, set by environment variable R_PAPERSIZE, or in `config.site'.
printcmd the command used for graphics printing; currently read-only, set by environment variable R_PRINTCMD, or in `config.site'.
show.signif.stars, show.coef.Pvalues logical, affecting P value printing, see print.coefmat.
ts.eps the relative tolerance for certain time series (ts) computations.

Description

options allows the user to set and examine a variety of global ``options'' which affect the way in which R computes and displays its results.

Details

Invoking options() with no arguments returns a list with the current values of the options. .Options is another way to access this list ``read only''.

Accessing current options, usually will work with .Options$width (e.g.), rather than options("width") which is a list of length one.

Value

A list (in any case) with the previous values of the options changed, or all options when no arguments were given.

Examples

options() # printing all current options
op <- options(); str(op) # nicer printing

# .Options is the same:
all(sapply(1:length(op), function(i) all(.Options[[i]] == op[[i]])))

options('width')[[1]] == options()$width # the latter needs more memory
options(digits=20)
pi

# set the editor, and save previous value
old.o <- options(editor="nedit")
old.o

options(op)	# reset (all) initial options
options('digits')

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