How to remove the box frame in “plot.raster” in R package “raster”

Question

I need to remove the box frame around the figure in R package \"raster\", but I cannot figure out which argument I should change. The example is as follows:

Answer 1

The best I can suggest is

plot(r,axes=F,useRaster=F)

The option bty='n' usually gets rid of the box, but the raster-plotting function seems to be drawing its own box on top of the regular box that you can't get rid of.