CODEWITHSUNDEEP
rggplot2
spore234
spore234

Reputation: 3640

change line color in ggplot

I have this data frame:

dftt <- data.frame(values = runif(11*4,0,1),
                 col = c(rep(2,4),
                         rep(1,4),
                         rep(5,9*4)),
                 x= rep(1:4, 11*4),
                 group=rep(factor(1:11), each=4)
                 )

> head(dftt)
     values col x group
1 0.2576930   2 1     1
2 0.4436522   2 2     1
3 0.5258673   2 3     1
4 0.2751512   2 4     1
5 0.5941050   1 1     2
6 0.7596024   1 2     2

I plot it like this:

ggplot(dftt, aes(x=x, y=values, group=group, color=col)) + geom_line()

enter image description here

How can I change the line colors, I want the first two lines to be black and red (in the above plot they are both black) and the remaining lines to be gray (they are light blue)?

Upvotes: 1

Views: 10955

Answers (2)

JBGruber
JBGruber

Reputation: 12410

Is there a reason why you even try adding colors via col? It seems to me like this is strange as col has fewer values than group. If you just want to color the groups, this would be the correct way:

  ggplot(dftt, aes(x=x, y=values, group=group, color=group)) + 
  geom_line() +
  scale_color_manual(values = c("black",
                                "red",
                                rep("gray", 9)))

enter image description here

Upvotes: 3

Dave2e
Dave2e

Reputation: 24069

Covert your col column to a factor and then add scale_color_manual to your plot function.

library(ggplot2)
dftt$col<-as.factor(dftt$col)

ggplot(dftt, aes(x=x, y=values, group=group, color=col)) + geom_line(size=1.2) +
  scale_color_manual(values=c( "black", "red", "blue"))

You may need to rearrange the color scale to match your choice of color (1,2 and 5)

Upvotes: 1

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