Plotting a raster in BW

I don't have a file on my laptop, but an R image from one of my projects.

require(raster)

## Loading required package: raster
## Loading required package: sp

load("C:/Users/Ben/Dropbox/Shared Ben and Catherine/DimDivRevision/Results/DimDivRevision.RData")

# plot the raster, take away the axis ticks, and make it black and white
plot(elev.test, xaxt = "n", yaxt = "n", col = colorRampPalette(c("black", "white"))(255))

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writeRaster(elev.test, "C:/Users/Ben/Dropbox/Species Pool - Cost Path/elev_raster")

## Error: C:/Users/Ben/Dropbox/Species Pool - Cost Path/elev_raster.grd
## exists. Use 'overwrite=TRUE' if you want to overwrite it


# it should read in just fine.
test <- raster("C:/Users/Ben/Dropbox/Species Pool - Cost Path/elev_raster")
plot(test)

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