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

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:

library(raster)

r <- raster(nrows=10, ncols=10)

r <- setValues(r, 1:ncell(r))

plot(r)

plot(r,axes=F)

Solution

This works:

plot(r, axes=FALSE, box=FALSE)

To learn how you could have found that out for yourself, have a look at the underlying functions by trying the following. (The calls to showMethods() and getMethod() are needed because the raster package makes extensive use of S4 methods rather than the more commonly used S3 methods.)

showMethods("plot")
getMethod("plot", c("Raster", "ANY"))
getAnywhere(".plotraster2")
getAnywhere(".rasterImagePlot")
args(raster:::.rasterImagePlot)
# function (x, col, add = FALSE, legend = TRUE, horizontal = FALSE, 
#     legend.shrink = 0.5, legend.width = 0.6, legend.mar = ifelse(horizontal, 
#         3.1, 5.1), legend.lab = NULL, graphics.reset = FALSE, 
#     bigplot = NULL, smallplot = NULL, legend.only = FALSE, lab.breaks = NULL, 
#     axis.args = NULL, legend.args = NULL, interpolate = FALSE, 
#     box = TRUE, breaks = NULL, zlim = NULL, zlimcol = NULL, fun = NULL, 
#     asp, colNA = NA, ...)