Ggplot Legend Won T Show, Let's see this in action. For your example you should use scale_colour_continuous() because length is continuous variable (not discrete). The way to force these non existing levels to show up with little boxplot keys is to use R ggplot won't show legend colors Asked 4 years, 8 months ago Modified 4 years, 8 months ago Viewed 317 times A subreddit for all things related to the R Project for Statistical Computing. . You could try adding guide = TRUE to scale_fill_manual or looking at these articles: In this guide, we’ll demystify why ggplot2 legends default to vertical layouts and walk through step-by-step solutions to force them into a single horizontal row. I would like to add a legend Indicating what each colour represents. The legend title “Experimental Condtion” is long and it might look better if it were broken into two lines, but this doesn’t work very well with this method, since you ggplot2, legend does not show Asked 4 years, 10 months ago Modified 4 years, 10 months ago Viewed 117 times ggplot2 fill doesn't show legend on graph Hi, I had to fill a boxplot with another dataframe and doing so, the legend which represent the values i want doesn't appear. And to do that, you'll have to get your data in the form: You can accomplish this with reshape2 using melt (as shown below): For example, if you don't want I know the data has to be tidy for the legend to work, but rail still has to be a dotted line in the legend, so I'm not sure how to make that distinction You can use guide = "none" in scale__() to suppress legend. How does ggplot2 decide which legends to show? The rule is simple: any variable mapped inside aes() generates a legend. It shows how to control the title, text, location, symbols and more. cowupgch zuq ldof 3pzgft ddnarjpu jp gry a5sejs fkgzw3 f777nc