mutate in R

Adding or replacing columns, computed from the ones already there.

library(dplyr)

runs <- tibble(chars = c(1820, 1980), seconds = c(60, 45))

print(mutate(runs,
             wpm = chars / 5 / (seconds / 60),
             fast = wpm > 80))

print(mutate(runs, cps = chars / seconds, .before = 1))
print(mutate(runs, wpm = chars / 5, .keep = "used"))
print(transmute(runs, minutes = seconds / 60))

How it works

1. A new column can use a column defined earlier in the same call.
2. .before and .after place it without a separate relocate.
3. .keep controls which of the old columns survive.

Keywords and builtins used here

• c
• library
• mutate
• print
• tibble
• transmute

The run, in numbers

Lines

11

Characters to type

303

Tokens

99

Three-star pace

95 tpm

At the three-star pace of 95 tokens a minute, this run takes about 63 seconds.

Type this snippet

Step 1 of 4 in New columns, step 10 of 27 in dplyr.

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