Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

library(ggplot2)

# Built-in dataset
data(mpg)   # fuel economy data for 234 cars

# Minimal plot: just axes, no geom yet
ggplot(mpg, aes(x = displ, y = hwy))

# Scatter plot
ggplot(mpg, aes(x = displ, y = hwy)) +
    geom_point()

# Map colour to a categorical variable (inside aes)
ggplot(mpg, aes(x = displ, y = hwy, colour = class)) +
    geom_point()

# Fixed colour constant (outside aes)
ggplot(mpg, aes(x = displ, y = hwy)) +
    geom_point(colour = "steelblue", size = 2, alpha = 0.7)

# Add a smooth trend line
ggplot(mpg, aes(x = displ, y = hwy)) +
    geom_point(alpha = 0.4) +
    geom_smooth(method = "lm", se = TRUE)

# Map multiple aesthetics
ggplot(mpg, aes(x = displ, y = hwy,
                colour = class, size = cyl)) +
    geom_point(alpha = 0.6)

# Labels and title
ggplot(mpg, aes(x = displ, y = hwy, colour = drv)) +
    geom_point() +
    labs(
        title    = "Engine Displacement vs Highway MPG",
        subtitle = "By drive type",
        x        = "Displacement (litres)",
        y        = "Highway MPG",
        colour   = "Drive type"
    )