r - 标题不同时如何创建绘图功能？

Question

我想创建一张法国地图，并在不同的地图上显示不同的点。

代码很容易做到：

library(raster)

#mydata
pointA <- data.frame(longitude = c(5.819472,5.384418 ),
                   latitude = c(46.11558, 46.18197))
pointC <- data.frame (longitude = 4.218322,
                     latitude = 44.20379)


cartes <- function(point){
 france <- getData('GADM', country = 'FRA', level = 1) # Map of France
 plot(france, border = "red", main = "Name of the point") 
 points(point$longitude, point$latitude)
}

cartes(pointA)
cartes(pointC)

但是我找不到根据点名称更改标题的方法...

你知道怎么做吗？

标签： rfunctiontitle

Answer 1

使用ensym()可能会帮助您：

library(raster)

#mydata
pointA <- data.frame(longitude = c(5.819472,5.384418 ),
                     latitude = c(46.11558, 46.18197))
pointC <- data.frame (longitude = 4.218322,
                      latitude = 44.20379)


cartes <- function(point){
  france <- getData('GADM', country = 'FRA', level = 1) # Map of France
  plot(france, border = "red", main = ensym(point)) 
  points(point$longitude, point$latitude)
}

cartes(pointA)
cartes(pointC)