Losing the grey margin padding in a ggplot

Question

A would like to plot geom_tile() without displaying the surrounding grey frame. Example:

library(ggplot2)
p <- ggplot(melt(volcano), aes(x = X1, y = X2, z         


        

Answer 1

just do print(p1 + scale_x_continuous(expand = c(0, 0)) + scale_y_continuous(expand = c(0, 0))) and that will get rid of the gray space around