R - plot raster without box -

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i have problem getting rid of box when plotting raster colour scale:

require(raster) data(volcano) raster <- raster(volcano)  colfunc <- colorramppalette(c("blue", "red")) plot(raster, col = colfunc(40), breaks = seq(minvalue(raster), maxvalue(raster), length.out = 40), bty = "n", xaxt = "n", yaxt = "n")

the bty option doesn't work. missing here?

got it:

plot(raster, ..., bty="n", box=false)

it interesting both bty="n" , box=false must set! if try 1 of these, box printed!


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