ggpairs: adjusting axis labels to show minimum and maximum only

问题

I want to show just the minimum and maximum values for all the axes of a ggpairs {GGally} plot. Find below a reproducible example

df=as.data.frame(matrix(1:1000,nrow = 100))
ggpairs(df)

I know I can do it individually by using breaks, but I don't know how can I apply this in ggpairs. Can somebody help me?

来源：https://stackoverflow.com/questions/45764317/ggpairs-adjusting-axis-labels-to-show-minimum-and-maximum-only