rggcorrplot

Add Axis Labels to ggcorrplot?

How do I add axis labels to a ggcorrplot? I have a plot of the correlation between two separate attempts at a questionnaire. X axis represents the first attempt, Y axis represents the second attempt. I want to label the axes to show that this is what is being represented here.

My code looks like this:

corrQData <- round(cor(Attempt1, Attempt2), digits = 1)

ggcorrplot(corrQData, 
           outline.color = "white",
           ggtheme = theme_bw(),
           colors = c("#F8696B", "#FFEB84", "#63BE7B"),
           legend.title = "Correlation",
           lab = TRUE,
           lab_size = 3,
           tl.cex = 8,
           tl.srt = 0,
           title = "Correlation Between Questionnaire Attempts") +
  theme(plot.title = element_text(hjust = 0.5, size=10), legend.title = element_text(size = 10))

My plot looks like this:

enter image description here

I tried adding + scale_x_discreet(name = "Attempt 1") to the end of my ggcorrplot code but it didn't do anything.

Solution

  • You have to override the default behaviour of ggcorrplot which is not to display axis labels. Do that by adding labels with ggplot2::labs() (scale_x_discrete(name = ...) works fine also) and changing the plot's theme

    library(ggcorrplot)
corrdata <- round(cor(mtcars), 1)

ggcorrplot(corrdata) + 
  ggplot2::labs(x = 'X label', y = 'Y label') +
  ggplot2::theme(
    axis.title.x = element_text(angle = 0, color = 'grey20'),
    axis.title.y = element_text(angle = 90, color = 'grey20')
  )