小甲克虫 发表于 2014-1-7 20:32 
你没看懂题目。
In R, lists are generic vectors where each element can be virtually any type
of object; e.g., a vector (of arbitrary mode), a matrix, a full data frame, a
function, or again a list. Note that the latter also allows us to create recursive
data structures. Due to this flexibility, lists are the basis for most complex
objects in R; e.g., for data frames or fitted regression models (to name two
examples that will be described later).
咦，不是说这个？
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