Cannot run map_data(“state”)

问题

I am trying to work on a US map in R. I have done it a lot of times but this time it gives me this error when I try to load:

us<- map_data("state")
Error in .C(C_map_type, as.character(mapbase), integer(1)) : 
  Incorrect number of arguments (2), expecting 0 for ''

I have ggmap and ggplot2 libraries loaded. Where am I going wrong?

回答1:

You need the 'maps' package along with ggmap.

library(maps)
library(ggmap)
us<- map_data("state")

This should work

回答2:

It looks like there are bugs in tidyverse which interferes with ggplot2 maps functionality. See this related question.

This works in a clean, freshly-restarted R session:

us <- ggplot2::map_data("state")

However, this does not:

library(tidyverse)
us2 = ggplot2::map_data("state")

来源：https://stackoverflow.com/questions/45066628/cannot-run-map-datastate