table unclass class(unclass) 这几个函数不太懂意思？也不知其作用？
> table(x)
x
male female
2 3
> unclass(x)
[1] 2 2 1 1 2
attr(,"levels")
[1] "male" "female"
> class(unclass(x))
[1] "integer"
> ?table
> ?unclass
> ?class(unclass)
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> table(x)
x
male female
2 3
> unclass(x)
[1] 2 2 1 1 2
attr(,"levels")
[1] "male" "female"
> class(unclass(x))
[1] "integer"
> ?table
> ?unclass
> ?class(unclass)
2019-01-09
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