ggplot2 scatter plots in R

The grammar of graphics: data, aesthetics, layers.

library(ggplot2)

plot <- ggplot(mtcars, aes(x = wt, y = mpg, colour = factor(cyl))) +
  geom_point(size = 3, alpha = 0.8) +
  geom_smooth(method = "lm", se = FALSE) +
  labs(
    title = "Weight versus efficiency",
    x = "Weight (1000 lbs)",
    y = "Miles per gallon",
    colour = "Cylinders"
  ) +
  theme_minimal()

How it works

1. aes maps columns to x, y, and color.
2. geom_point and geom_smooth add layers with +.
3. labs and theme_minimal finish the presentation.

Keywords and builtins used here

• aes
• factor
• geom_point
• geom_smooth
• ggplot
• labs
• library
• theme_minimal

The run, in numbers

Lines

12

Characters to type

295

Tokens

78

Three-star pace

95 tpm

At the three-star pace of 95 tokens a minute, this run takes about 49 seconds.

Type this snippet

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

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