How to arrange multiple Hexbin plots together in r?

问题

I have four separate Hexbin Plots that I would like to view together in one frame.

I tired using par(mfrow...) to no avail.

par(mfrow=c(2,2))

hexbinplot(Sales ~ employee...)

hexbinplot(Sales ~ Quality...)

hexbinplot(Sales ~ Weather...)

hexbinplot(Sales ~ Year...)

I suspect the answer may be in panel.hexbinplot but I have been unable to find any resources that talk about linking multiple distinct graphs.

来源：https://stackoverflow.com/questions/56808810/how-to-arrange-multiple-hexbin-plots-together-in-r