Formatting numbers on a continuous axis in ggplot

Question

I would like to format the numbers on a continuous axis in a ggplot graph. I would like to have a French formatting for large numbers with a space every three digit (ie "20 000" instead of "20000"). I know it is possible to do it using the format() function (for instance format(20000, scientific=FALSE, big.mark = " ")) but I don't know how to combine this function with ggplot. I can imagine that there is an option in the scale_y_continuous() but I was unable to find the solution by myself. Here is my gist file.

Answer 1

french = function(x) format(x, big.mark = " ")

p + scale_y_continuous(labels=french)