How can I plot multiple lines in ggplot2?

How can I plot multiple lines in ggplot2?

You can use the ggplot() function along with geom_line() to plot multiple lines. You need to have your data in a long format.

Can you show me an example with sample data?

Sure! Here's a simple example:

library(ggplot2)

# Sample data
data <- data.frame(
  x = rep(1:10, 3),
  y = c(1:10, 2:11, 3:12),
  group = rep(c('A', 'B', 'C'), each = 10)
)

# Plotting
ggplot(data, aes(x = x, y = y, color = group)) +
  geom_line() +
  labs(title = 'Multiple Lines Plot')

This will create a line plot with three different lines for groups A, B, and C.

What if I want to customize the colors and line types?

You can customize colors and line types using the scale_color_manual() and scale_linetype_manual() functions. Here's how:

ggplot(data, aes(x = x, y = y, color = group, linetype = group)) +
  geom_line() +
  scale_color_manual(values = c('red', 'blue', 'green')) +
  scale_linetype_manual(values = c('solid', 'dashed', 'dotted')) +
  labs(title = 'Customized Multiple Lines Plot')