Draw Multiple Variables as Lines to Same ggplot2 Plot in R (2 Examples) | geom_line & reshape2 melt

R code of this video:

y1 = sort(rnorm(50)),
y2 = sort(rnorm(50, 0.5)))
head(data) # Head of example data

library("ggplot2") # Load ggplot2 package

ggp1 ＜- ggplot(data, aes(x)) + # Create ggplot2 plot
geom_line(aes(y = y1, color = "red")) +
geom_line(aes(y = y2, color = "blue"))
ggp1 # Draw ggplot2 plot

library("reshape2")

data_long ＜- melt(data, id = "x") # Convert data to long format
head(data_long) # Head of long data

ggp2 ＜- ggplot(data_long, # Create ggplot2 plot
aes(x = x,
y = value,
color = variable)) +
geom_line()
ggp2 # Draw ggplot2 plot

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