安装caret后无法加载(library(caret) ),提示“不存在叫‘caret’这个名字的程辑包”?
提示的警告和错误如下:
Warning in install.packages :
error 1 in extracting from zip file
Warning in install.packages :
cannot open compressed file 'stringi/DESCRIPTION', probable reason 'No such file or directory'
Error in install.packages : cannot open the connection