当我尝试在R中安装插入符号软件包时,出现以下错误消息:
utils:::menuInstallPkgs() --- Please select a CRAN mirror for use in this session --- Warning: failed to download mirrors file (cannot open URL 'https://cran.r-project.org/CRAN_mirrors.csv'); using local file 'C:/PROGRA~1/R/R-34~1.0/doc/CRAN_mirrors.csv' Warning: unable to access index for repository https://rweb.crmda.ku.edu/cran/src/contrib: cannot open URL 'https://rweb.crmda.ku.edu/cran/src/contrib/PACKAGES' Warning: unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/src/contrib: cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES' Error in install.packages(NULL, .libPaths()[1L], dependencies = NA, type = type) : no packages were specified In addition: Warning message: In download.file(url, destfile = f, quiet = TRUE) : InternetOpenUrl failed:
我该如何解决?
答案 0 :(得分:0)
尝试以下任何一种方法:
编辑:将https更改为http
install.packages("http://cran.r-project.org/src/contrib/caret_6.0-80.tar.gz",
repos=NULL, method="libcurl")
或
library(devtools)
install_url("http://cran.r-project.org/src/contrib/caret_6.0-80.tar.gz")