r - Get Quantile values from geom_boxplot() -

i'm using ggplot2 function geom_boxplot() create boxplots of data.

similarly this question, i'd quantile values used creation of boxplot, e.g., in matrix. there way print out values used within geom_boxplot()?

probably easiest way use outside of ggplot aggregate, here's how ggplot, using function ggplot_build on created plot:

library(ggplot2) p <- ggplot(mtcars, aes(x=factor(gear), y=mpg)) + geom_boxplot()  ggplot_build(p)$data  [[1]]   ymin lower middle  upper ymax outliers notchupper notchlower x panel group weight ymin_final ymax_final 1 10.4  14.5   15.5 18.400 21.5            17.09102   13.90898 1     1     1      1       10.4       21.5 2 17.8  21.0   22.8 28.075 33.9            26.02695   19.57305 2     1     2      1       17.8       33.9 3 15.0  15.8   19.7 26.000 30.4            26.90729   12.49271 3     1     3      1       15.0       30.4    xmin  xmax 1 0.625 1.375 2 1.625 2.375 3 2.625 3.375