see the function level() in raster. also levelplot in rastervis package.
you basically create a raster attribute table coerce the raster to factor
class and plot. check geo sig i have posted the same question there
On Oct 29, 2012 2:15 AM, "Jonsson" <amen.alyaari@bordeaux.inra.fr> wrote:

> This code will read binary file and display it as a map. may problem is
> that
> this code is using a continuous colour scheme, even though I have discrete
> data (which  is a classification scheme). How can I map numbers to colours
> with raster? Please
>
> require(raster)
> conne <- file("C:\\lai.bin", "rb")
> sd<- readBin(conne, integer(), size=1,  n=360*720, signed=F)
>  y<-t(matrix((data=sd), ncol=360, nrow=720))
>  r = raster(y)
> extent(r) = extent(c(xmn=-180,xmx=180,ymn=-90,ymx=90))
> plot(r)
>
>
>
>
>
> --
> View this message in context:
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> Sent from the R help mailing list archive at Nabble.com.
>
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