Data frames in R

The rectangular table at the center of R analysis.

people <- data.frame(
  name = c("ada", "grace", "kay"),
  score = c(95, 88, 92),
  stringsAsFactors = FALSE
)

shape <- dim(people)
columns <- names(people)
first_rows <- head(people, 2)
structure <- str(people)

people$passed <- people$score >= 90
one_cell <- people[2, "score"]

How it works

1. data.frame builds one column by column.
2. dim, names, head, and str inspect it.
3. df$new <- ... adds a computed column.

Keywords and builtins used here

• c
• dim
• head
• names
• str

The run, in numbers

Lines

13

Characters to type

274

Tokens

77

Three-star pace

90 tpm

At the three-star pace of 90 tokens a minute, this run takes about 51 seconds.

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Step 1 of 3 in Building & inspecting, step 1 of 8 in Data frames in base R.

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