save(X,file="test.RData")报错原因：
如要保存.RData文件，需用save.image(X,file="test.RData")或save(list = ls(all.names = TRUE), file = ".RData", envir = .GlobalEnv)
save.image() is just a short-cut for ‘save my current workspace’, i.e., save(list = ls(all.names = TRUE), file = ".RData", envir = .GlobalEnv). It is also what happens with q("yes").
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