As far as I can tell facet_wrap fills by row. In the same way you can specify how to fill a matrix with byrow I was hoping you could do the same with facet_wrap. I know I could reorder the levels of a factor to plot in this maner but this seems like a bit of work if there's a shorter method that I'm overlooking. 

library(ggplot2)

ggplot(mtcars, aes(x=gear,  y=mpg, fill=vs)) +
    geom_bar(position="dodge", stat="identity") + 
    facet_wrap(~ carb, ncol=2)  #fills by row

How can we fill by column?

r ggplot2
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