filter in R

Keeping rows, with conditions combined by comma or by operator.

library(dplyr)

runs <- tibble(
  lang = c("r", "python", "sql", "css", NA),
  tpm = c(96, 104, 79, 70, 88)
)

print(filter(runs, tpm > 80, lang != "sql"))
print(filter(runs, tpm > 100 | lang == "css"))
print(filter(runs, between(tpm, 75, 97)))
print(filter(runs, lang %in% c("r", "sql")))
print(filter(runs, is.na(lang)))
print(nrow(filter(runs, lang != "r")))

How it works

1. Commas mean and; use | for or.
2. between and %in% replace longer comparisons.
3. filter drops NA rows for the tested column, which surprises people.

Keywords and builtins used here

• between
• c
• filter
• library
• nrow
• print
• tibble

The run, in numbers

Lines

13

Characters to type

357

Tokens

135

Three-star pace

95 tpm

At the three-star pace of 95 tokens a minute, this run takes about 85 seconds.

Type this snippet

Step 1 of 5 in Rows, step 5 of 27 in dplyr.

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