有老师在吗?
请问安装常用的包,比如car包、Hmisc包,报错,一直警告,该怎么办才能安装成功呢?
万份感谢
Error in download.file(url, destfile, method, mode = "wb", ...) :
cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.3/car_3.0-0.zip'
Warning in install.packages :
download of package ‘car’ failed
Warning in install.packages :
InternetOpenUrl failed: '操作超时'
Error in download.file(url, destfile, method, mode = "wb", ...) :
cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.3/car_3.0-0.zip'
Warning in install.packages :
download of package ‘car’ failed