[r] Plot multiple lines (data series) each with unique color in R

If you would like a ggplot2 solution, you can do this if you can shape your data to this format (see example below)

# dummy data
set.seed(45)
df <- data.frame(x=rep(1:5, 9), val=sample(1:100, 45), 
                   variable=rep(paste0("category", 1:9), each=5))
# plot
ggplot(data = df, aes(x=x, y=val)) + geom_line(aes(colour=variable))

ggplot2_geom_line

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