here: Capture current evaluation context.

In plyr: Tools for Splitting, Applying and Combining Data

Capture current evaluation context.

Description

This function captures the current context, making it easier to use **ply with functions that do special evaluation and need access to the environment where ddply was called from.

Usage

here(f)

Arguments

f	a function that does non-standard evaluation

Author(s)

Peter Meilstrup, https://github.com/crowding

Examples

df <- data.frame(a = rep(c("a","b"), each = 10), b = 1:20)
f1 <- function(label) {
   ddply(df, "a", mutate, label = paste(label, b))
}
## Not run: f1("name:")
# Doesn't work because mutate can't find label in the current scope

f2 <- function(label) {
   ddply(df, "a", here(mutate), label = paste(label, b))
}
f2("name:")
# Works :)

plyr documentation built on Oct. 2, 2023, 9:07 a.m.