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How to extract axes labels for the plot drawn using ggplot2 in R?
When we create a plot using ggplot2, the axes labels are automatically generated for both the axes. We might want to use those axes labels for report writing or some other purpose, therefore, extraction of those labels for a plot created by using ggplot2 package can be found by using the ggplot_build function as shown in the below example but we need to save the plot in an object.
Consider the below data frame −
Example
x<-rnorm(20) y<-rnorm(20,5,0.32) df<-data.frame(x,y) df
Output
x y 1 -0.48260000 5.306990 2 1.46738002 5.065480 3 -0.41960276 4.833763 4 1.13728029 4.927692 5 -0.58233296 4.789553 6 -1.33506461 4.752065 7 -0.15042591 4.672583 8 -0.14903138 4.671353 9 1.00647384 5.090690 10 -0.18414152 4.815529 11 -2.20077514 4.353975 12 1.00566656 5.050006 13 0.14784372 5.067741 14 1.35535140 4.858750 15 -0.59944199 5.457906 16 -0.95290747 4.994523 17 -2.12832109 5.348286 18 -1.63202006 5.100371 19 0.07918045 4.869089 20 -1.23168746 4.617075
Loading ggplot2 package and creating scatterplot between x and y −
Example
library(ggplot2) p<-ggplot(df,aes(x,y))+geom_point() p
Output
ggplot_build(p)$layout$panel_params[[1]]$y$get_labels()
[1] NA "4.50" "4.75" "5.00" "5.25" "5.50"
ggplot_build(p)$layout$panel_params[[1]]$x$get_labels()
[1] "-2" "-1" "0" "1" NA
Updated on: 08-Feb-2021
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