pull: Pull out a single variable

In YTLogos/dplyr: A Grammar of Data Manipulation

Description

This works like [[ for local data frames, and automatically collects before indexing for remote data tables.

Usage

pull(.data, var = -1)

Arguments

.data	A table of data
var	A variable specified as: a literal variable name a positive integer, giving the position counting from the left a negative integer, giving the position counting from the right. The default returns the last column (on the assumption that's the column you've created most recently).

Examples

mtcars %>% pull(-1)
mtcars %>% pull(1)
mtcars %>% pull(cyl)

# Also works for remote sources
if (requireNamespace("dbplyr", quietly = TRUE)) {
df <- dbplyr::memdb_frame(x = 1:10, y = 10:1, .name = "pull-ex")
df %>%
  mutate(z = x * y) %>%
  pull()
}

YTLogos/dplyr documentation built on May 20, 2019, 1:44 p.m.