I want to use rgdal to plot a shapefile graduating the colour of features according to the values of one field (density). I couldn't find online detailed indications on how to do it and the package documentation doesn't explain the options for plot().
This is what I composed so far
library(rgdal)
shapefile = "shapefile.shp"
map <- readOGR(dsn = shapefile, layer = "shapefile", verbose=FALSE)
plot(map, xlim = c(6.70, 18.32), ylim = c(35.2, 47.6), border=NA, add=TRUE)
This is the style in QGIS I am trying to replicate:
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