Hi,

I'm quite fresh to R, and a layman of English as well. I hope I can make you
understood.

Now I have two vectors A and B. Is there any quick way to know whether B is
a subset of A? and If B is a subset of A, can I know easily which elements
in A (the index of A) equals to B's elements accordingly?

For example,

> a<-1:20
> b=c(2,5,9,7,4,8,3)
>

Question 1: we know b is a subset of a, but how does R know that?

Question 2: since we know b is a subset of a, then which a's elements equals
to b? I do it like this:

test=0
> for (i in 1:length(b)) test[i]=which(a==b[i])
> test
>

Is there any easier way to know these indexes?

Thanks a lot for you helps in advance

-- 
Samuel Wu

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