pryr: substitute_q – R documentation

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substitute_q

A version of substitute that evaluates its first argument.

Description

This version of substitute is needed because substitute does not evaluate it's first argument, and it's often useful to be able to modify a quoted call.

Usage

substitute_q(x, env)

Arguments

`x`	a quoted call
`env`	an environment, or something that behaves like an environment (like a list or data frame), or a reference to an environment (like a positive integer or name, see `as.environment` for more details)

Examples

x <- quote(a + b)
substitute(x, list(a = 1, b = 2))
substitute_q(x, list(a = 1, b = 2))

pryr

Tools for Computing on the Language

v0.1.4

GPL-2

Authors

Hadley Wickham [aut, cre], R Core team [ctb] (Some code extracted from base R)

Initial release