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rapply() 中的参数how = c("unlist", "replace", "list")，list和unlist是分别以列表和非列表的形式输出结果，replace呢？有人知道吗，求指点，R的帮助看不太懂啊
If how = "replace", each element of the list which is not itself a list and has a class included in classes is replaced by the result of applying f to the element.
If the mode is how = "list" or how = "unlist", the list is copied, all non-list elements which have a class included in classes are replaced by the result of applying f to the element and all others are replaced by deflt. Finally, if how = "unlist", unlist(recursive = TRUE) is called on the result.

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关键词：apply appl App RAP Recursive elements included replace classes itself

这个函数整体是这样的——
rapply(object, f, classes = "ANY", deflt = NULL, how = c("unlist", "replace", "list"), ...)


如果how = "replace"，这本身并不是一个list，
使用了replace之后，f函数就作用于object中每一个元素，
得出的运算结果，取代之前的每个元素。