select in R

Choosing columns by name, position, pattern or type.

library(dplyr)

runs <- tibble(
  lang = c("r", "python"),
  tpm_best = c(96, 104),
  tpm_mean = c(92, 99),
  stars = c(3L, 3L)
)

print(select(runs, lang, stars))
print(select(runs, -stars))
print(select(runs, starts_with("tpm")))
print(select(runs, where(is.numeric)))
print(select(runs, stars, everything()))
print(rename(runs, best = tpm_best))

How it works

1. A leading minus drops a column instead of keeping it.
2. starts_with, contains and where select by pattern or predicate.
3. everything() is how you move a column to the front.

Keywords and builtins used here

• c
• everything
• library
• print
• rename
• select
• starts_with
• tibble
• where

The run, in numbers

Lines

15

Characters to type

340

Tokens

116

Three-star pace

90 tpm

At the three-star pace of 90 tokens a minute, this run takes about 77 seconds.

Type this snippet

Step 2 of 4 in Tibbles & columns, step 2 of 27 in dplyr.

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select in other languages

• Go
• Python