See example below. rast<- raster(nrows=10, ncols=10) rast[1:20] <- 3 rast[21:25] <- 9 rast[26:40] <- 2 rast[40:50] <- 7 rast[51:100] <- 1 plot(rast) values(rast) <- ifelse(values(rast) %in% c(9,7), 1, NA) # just replace c(9,7) by your vector dev.new() plot(rast)
Arnaud
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