Substitutions in Language Objects

Description

Substitute differs from substitute in so far as its first argument can be a variable that contains an object of mode “language”. In that case, substitutions take place inside this object.

Usage

Substitute(lang,with)

Arguments

lang

any object, unevaluated expression, or unevaluated language construct, such as a sequence of calls inside braces

with

a named list, environment, data frame or data set.

Value

An object of storage mode “language” or “symbol”.

Details

The function body is just do.call("substitute",list(lang,with)).

Examples

lang <- quote(sin(x)+z)
substitute(lang,list(x=1,z=2))
lang
Substitute(lang,list(x=1,z=2))
sin(1) + 2