pull: Column selection

In paulponcet/lplyr: 'dplyr' Verbs for Lists and Other Verbs for Data Frames

Description

The function pull selects a column in a data frame and transforms it into a vector. This is useful to use it in combination with magrittr's pipe operator and dplyr's verbs.

Usage

pull(.data, j)

pull_(.data, j)

## S3 method for class 'data.frame'
pull_(.data, j)

## S3 method for class 'matrix'
pull_(.data, j)

## S3 method for class 'list'
pull_(.data, j)

Arguments

.data	A tbl.
j	integer. The column to be extracted.

Value

A vector of length nrow(.data)

Author(s)

Adapted from Tommy O' Dell, see http://stackoverflow.com/a/24730843/3902976 on StackOverflow.

Examples

library(dplyr)
mtcars[["mpg"]]
mtcars %>% pull(mpg)

# more convenient than (mtcars %>% filter(mpg > 20))[[3L]]
mtcars %>%
  filter(mpg > 20) %>%
  pull(3)

paulponcet/lplyr documentation built on May 24, 2019, 10:32 p.m.