R: Options Settings

options {base}

R Documentation

Options Settings

Description

This function allows the user to set and examine a variety of global “options” which affect the way in which R computes and displays its results.

Invoking options() with no arguments returns a list with the current values of the options.

Usage

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`.
`contrasts`	The default contrasts used in model fitting such as `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.
`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’.
`ts.eps`	the relative tolerance for certain time series (`ts`) computations.

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('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')

[Package base version 0.60 ]