CODEWITHSUNDEEP
rplotggplot2
statsgrad1990
statsgrad1990

Reputation: 89

Change colours of ggplot2 (R) using column names

I have a data frame (see below) and I want to change the colors of the plot in ggplot2 so that all the A's are colored red, B's blue, C's black, and D's yellow. 

myDF

label    A    B    C    D
lab1 0.69 0.65 0.73 0.71
lab2 0.43 0.41 0.47 0.41
lab3 0.53 0.47 0.57 0.53
lab4 0.55 0.47 0.60 0.55
lab5 0.53 0.47 0.58 0.53

I tried the following:

p <- ggplot(myDF, aes(x=label)) 
     + geom_point(aes(y=A))
     + geom_point(aes(y=B))
     + geom_point(aes(y=C))
     + geom_point(aes(y=D))
     + scale_colour_manual(values=c("A"="red", "B"= "blue", "C"="black", "D"="yellow"))

But it gives me an error. If I don't add the scale_colour_manual part, it gives the correct plot but all black dots. How can I do this? Thanks in advance!

Upvotes: 2

Views: 10222

Answers (1)

neilfws
neilfws

Reputation: 33802

Get your data into long format first. And I'd reconsider yellow on white. 

library(tidyr)
library(ggplot2)

myDF %>% 
  gather(key, value, -label) %>% 
  ggplot(aes(label, value)) + geom_point(aes(color = key)) +
    scale_colour_manual(values=c("red", "blue", "black", "yellow"))

Upvotes: 5

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