alaylm000
> chooseCRANmirror()
Warning: failed to download mirrors file (无法打开URL'https://cran.r-project.org/CRAN_mirrors.csv'); using local file 'C:/PROGRA~1/R/R-33~1.1/doc/CRAN_mirrors.csv'
Warning message:
In download.file(url, destfile = f, quiet = TRUE) :
InternetOpenUrl失败:’无法与服务器建立连接'
尝试各种方法,一直提示这个问题