How to control ggplot's plotting area proportions instead of fitting them to devices in R?

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By default, each plot in ggplot fits its device.

That's not always desirable. For instance, one may need to make tiles in geom_tile to be squares. Once you change the device or change the number of elements on x/y-axis, the tiles are no longer squares.

Is it possible to set hard proportions or size for a plot and fit the plot in its device's window (or make the device width and height proportional to those of the plot)?

ggplot2 plot r
3 Answers

A cleaner way is to use the theme(aspect.ratio) argument e.g. 

library(ggplot2)
d <- data.frame(x=rnorm(100),y=rnorm(100)*1000)
ggplot(d,aes(x,y))+
geom_point() +
theme(aspect.ratio=1/10) #Long and skinny

enter image description here

coord_fixed() sets the ratio of x/y coordinates, which isn't always the same thing (e.g. in this case, where the units of x and y are very different.

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