Warning in install.packages :
InternetOpenUrl failed: '无法与服务器建立连接'
Warning in install.packages :
InternetOpenUrl failed: '无法与服务器建立连接'
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.2
Packages which are only available in source form, and may
need compilation of C/C++/Fortran: ‘reshape2’ ‘NMF’
‘igraph’
These will not be installed
installing the source packages ‘ggplot2’, ‘magrittr’, ‘irlba’
trying URL 'https://cran.rstudio.com/src/contrib/ggplot2_1.0.1.tar.gz'
Warning in install.packages :
InternetOpenUrl failed: '无法与服务器建立连接'
Error in download.file(url, destfile, method, mode = "wb", ...) :
cannot open URL 'https://cran.rstudio.com/src/contrib/ggplot2_1.0.1.tar.gz'
Warning in install.packages :
download of package ‘ggplot2’ failed
trying URL 'https://cran.rstudio.com/src/contrib/magrittr_1.5.tar.gz'
其实换个CRAN即可。
步骤:<