substitute_q: A version of substitute that evaluates its first argument.

In pryr: Tools for Computing on the Language

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 documentation built on Jan. 18, 2023, 1:08 a.m.