2 回答> library(caret) 载入需要的程辑包:lattice Error in nchar(homeDir) : invalid multibyte string, element 1 载入需要的程辑包:ggplot2 Error in nchar(homeDir) : invalid multibyte string, element 1 Error in nchar(homeDir) : invalid multibyte string, element 1 > install.packages