Options Settings

Usage

options(...)
.Options

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')