Manual legend labels for line graph ggplot2 in R

Question

This seems like a fairly basic question, but I\'m relatively new to ggplot2 and I can\'t seem to figure this out. If there is something basic about the \"grammar\" that I\'m mis

Answer 1

It's recommended to use data in long format for ggplot2, so melt your data first:

library(reshape2)
avgTerms.m <- melt(avgTerms, id.vars = "itNum")

And then assign the colours based on variable:

ggplot(data = avgTerms.m, aes(itNum, value, colour = variable)) +
  geom_line() +
  labs(x = "Iteration Number", y = "Avg # of Tags Applied") +
  scale_colour_manual(values = cbb)