| map_data {ggplot2} | R Documentation |
Convert map to data frame
map_data(map, region = ".")
map |
map name |
region |
region name |
Hadley Wickham <h.wickham@gmail.com>
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")
}