CODEWITHSUNDEEP
rggplot2
Pascal
Pascal

Reputation: 583

ggplot multiple lines colored as gradient

I'm currently struggling to wrap my head around the following objective:

I not even get the simple example working. So far I have:

df <- data.frame(xval = rep(1:5, 8),
                 yval = runif(40),
                 pval = rep(c(rep(1,5), rep(2, 5)),4),
                 plt = rep(c(rep("mag", 10), rep("ph", 10)), 2),
                 p = c(rep("p1", 20), rep("p2", 20))
                 )
ggplot(df, aes(xval, yval)) +
  geom_line(aes(colour = pval)) +
  facet_grid(plt~p)

Would very much appreciate your help.

Upvotes: 0

Views: 740

Answers (1)

Roland
Roland

Reputation: 132706

Since pval is not a factor variable you need to specify the grouping explicitly.

ggplot(df, aes(xval, yval)) +
  geom_line(aes(colour = pval, group = pval)) +
  facet_grid(plt~p)

Upvotes: 2

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