Change Legend Labels of ggplot2 Plot in R (2 Examples) | Modify Item Text | scale_color_manual()

R code of this video:

y = 1,
data # Print example data

library("ggplot2") # Load ggplot2

ggp ＜- ggplot(data, aes(x, y, col = group)) + # Create default ggplot2 plot
geom_point()
ggp # Draw ggplot2 plot

ggp + # Modify labels and colors
scale_color_manual(labels = c("Group 1", "Group 2", "Group 3"),
values = c("red", "blue", "green"))

data_new ＜- data # Duplicate data
levels(data_new$group) ＜- list("Group 1" = "a", # Change factor levels
"Group 2" = "b",
"Group 3" = "c")

ggp_new ＜- ggplot(data_new, aes(x, y, col = group)) + # Recreate ggplot2 plot
geom_point()
ggp_new # Draw updated ggplot2 plot

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[robinbauwens]

You literally explained in seconds what took me hours, much appreciated!

[timding]

You are awesome! I have been looking for ways of formatting legends for so long. Thank you very much!!!

[Olivertheking]

May I just say your videos are superb. They have helped me countless times during my degree! The simple explanations and easy to follow videos are awesome. Thank You!!!

[denisedrachenberg]

I really appreciate all of your content. It has been a tremendous help. THANK YOU.

[nicholaskerry]

This was really helpful and easy to follow, thank you!!

[haraldurkarlsson]

What caught my eye is the fact that data.frame "knows" that the value 1 is repeated six times. Seems like it is enough just to set one variable - in this case x - and the rest will follow. I did not know that and would probably have use rep() needlessly.