| map_data {ggplot2} | R Documentation |
Create a data frame of map data.
map_data(map, region = ".", exact = FALSE, ...)
map |
name of map provided by the maps package. These
include |
region |
name of subregions to include. Defaults to |
exact |
should the |
... |
all other arguments passed on to |
if (require("maps")) {
states <- map_data("state")
arrests <- USArrests
names(arrests) <- tolower(names(arrests))
arrests$region <- tolower(rownames(USArrests))
choro <- merge(states, arrests, sort = FALSE, by = "region")
choro <- choro[order(choro$order), ]
qplot(long, lat, data = choro, group = group, fill = assault,
geom = "polygon")
qplot(long, lat, data = choro, group = group, fill = assault / murder,
geom = "polygon")
}