> > intersect(c(1,3,2),c('1','3'))
> [1] "1" "3"
>
> Apparently, intersect() treats num as string. But this is not
> documented in the help. Could somebody add it in the future version of
> R?
>
This is more a general coercion feature. For example 1 == "1", see ?Comparison.
> Also according to the help, the argument should not have duplicated
> elements.
I think this is just because these functions were written with sets in mind,
which would not have duplicated values, thus the word "conceptually". The
duplicated elements are simply discarded.
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