使用R中的循环创建50+国家/地区图可以通过以下步骤实现:
install.packages(c("ggplot2", "maps", "mapdata"))
library(ggplot2)
library(maps)
library(mapdata)
countries <- c("China", "United States", "India", "Indonesia", "Pakistan", "Brazil", "Nigeria", "Bangladesh", "Russia", "Mexico", "Japan", "Ethiopia", "Philippines", "Egypt", "Vietnam", "DR Congo", "Turkey", "Iran", "Germany", "Thailand", "United Kingdom", "France", "Italy", "Tanzania", "South Africa", "Myanmar", "Kenya", "South Korea", "Colombia", "Spain", "Uganda", "Argentina", "Algeria", "Sudan", "Ukraine", "Iraq", "Afghanistan", "Poland", "Canada", "Morocco", "Saudi Arabia", "Uzbekistan", "Peru", "Angola", "Malaysia", "Mozambique", "Ghana", "Yemen", "Nepal", "Venezuela", "Madagascar", "Cameroon")
map_data <- data.frame()
maps
包中获取相应的地图数据:for (country in countries) {
map <- map_data("world", country)
map_data <- rbind(map_data, map)
}
ggplot() +
geom_polygon(data = map_data, aes(x = long, y = lat, group = group), fill = "lightblue", color = "white") +
coord_equal() +
theme_void()
这样就可以使用R中的循环创建50+国家/地区图。请注意,以上代码仅提供了一个基本的示例,你可以根据需要进行修改和定制。
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