The grammar in R

Data, aesthetic mapping, geometry: every plot is those three plus extras.

library(ggplot2)
library(tibble)

runs <- tibble(
  day = 1:6,
  tpm = c(88, 92, 96, 99, 104, 101),
  lang = rep(c("r", "python"), each = 3)
)

plot <- ggplot(runs, aes(x = day, y = tpm)) +
  geom_point(size = 2) +
  geom_line()

print(class(plot))
print(length(plot$layers))
ggsave(tempfile(fileext = ".png"), plot, width = 5, height = 3, dpi = 100)

How it works

1. aes maps columns to visual properties.
2. A geom draws; layers add with +.
3. The object is a value, so it can be stored and modified.

Keywords and builtins used here

• aes
• c
• class
• geom_line
• geom_point
• ggplot
• ggsave
• length
• library
• print
• rep
• tempfile
• tibble

The run, in numbers

Lines

16

Characters to type

340

Tokens

121

Three-star pace

95 tpm

At the three-star pace of 95 tokens a minute, this run takes about 76 seconds.

Type this snippet

Step 1 of 3 in The grammar, step 1 of 15 in ggplot2.

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