Exact Positioning of multiple plots in ggplot2 with grid.arrange
问题 I'm trying to create a multiple plot with the same x-axis but different y-axes, because I have values for two groups with different ranges. As I want to control the values of the axes (respectively the y-axes shall reach from 2.000.000 to 4.000.000 and from 250.000 to 500.000), I don't get along with facet_grid with scales = "free" . So what I've tried is to create two plots (named "plots.treat" and "plot.control") and combine them with grid.arrange and arrangeGrob . My problem is, that I don