你的问题也很不清楚啊，没法回答

就是Vector这个东西的概念都看不明白呢还

由一些元素组成的向量，可以理解为一个集合。

Description
vector produces a vector of the given length and mode.

as.vector, a generic, attempts to coerce its argument into a vector of mode mode (the default is to coerce to whichever vector mode is most convenient): if the result is atomic all attributes are removed.

is.vector returns TRUE if x is a vector of the specified mode having no attributes other than names. It returns FALSE otherwise.

Usage
vector(mode = "logical", length = 0)
as.vector(x, mode = "any")
is.vector(x, mode = "any")

is.vector(A)：判断A是否为向量；
as.vector(A)：如A是矩阵（数组），as.vector就是将矩阵转化为向量；