更新R 更新R包 更新所有R包如果用的是Rstudio，要更新library里所有包，一种方法是点击Tools，选择Check for Pack...
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R及R包安装、更新、卸载、删除
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读purrr包有感一、利用purrr中的lmap函数创建含有哑变量的数据框 disjoin <- function(x, sep = "_") {name <- ...
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