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bquote {base}

Package: 
base
Version: 
R 2.15.0

Description

An analogue of the LISP backquote macro. bquote quotes its argument except that terms wrapped in .() are evaluated in the specified where environment.

Usage

bquote(expr, where = parent.frame())

Arguments

expr
A language object.
where
An environment.

Values

A language object.

See Also

quote, substitute

Examples

require(graphics)
 
a <- 2
 
bquote(a == a)
quote(a == a)
 
bquote(a == .(a))
substitute(a == A, list(A = a))
 
plot(1:10, a*(1:10), main = bquote(a == .(a)))
 
## to set a function default arg
default <- 1
bquote( function(x, y = .(default)) x+y )

Documentation reproduced from R 2.15.0. License: GPL-2.