a384147848 install.packages("map") Warning: unable to access index for repository https://mirrors.eliteu.cn/CRAN/src/contrib: cannot open URL 'https://mirrors.eliteu.cn/CRAN/src/contrib/PACKAGES' Warning: unable to access index for repository https://mirrors.eliteu.cn/CRAN/bin/macosx/el-capitan/contrib/3.4: cannot open URL 'https://mirrors.eliteu.cn/CRAN/bin/macosx/el-capitan/contrib/3.4/PACKAGES' Warning message: package 'map' is not available (for R version 3.4.3) library(map) Error in library(map) : there is no package called 'map' 这是为什么
tctcab 用科大镜像 http://mirrors.ustc.edu.cn/CRAN/ install.packages("map", repos = "http://mirrors.ustc.edu.cn/CRAN/")
a384147848 tctcab 大佬，这种问题怎么解决？只能更新版本吗？ library(nycflights13) Warning message: package 'nycflights13' was built under R version 3.4.4
