Re: [R] maximum of identical elements in a vector

From: Chuck Cleland <ccleland_at_optonline.net>
Date: Sun, 30 Mar 2008 17:45:08 -0400

On 3/30/2008 5:35 PM, Daniel Malter wrote:
> Hi,
>
> the problem I have is seemingly very simple, but not simple enough for me to
> figure out. I just want to find the most (or least) frequent element in the
> vector.
>
> a=c("Alice","Alice","Alice","Alice","Bob","Bob")
> unique(a)
> length(which(a=="Alice"))
>
>
> unique(a) shows me that the elements in my vector are "Alice" and "Bob". The
> latter expression gives 4 as the frequency of "Alice" in vector a.
> To find the maximum frequency of the unique elements, however, it assumes
> that I know that "Alice" is the most (or least) frequent element. Therefore,
> how can find that "Alice" is the most frequent element in this vector? I
> assume there is an easier way than computationally intensive loops (for long
> vectors).

 > names(which.max(table(a)))
[1] "Alice"

> Cheers,
> Daniel
>
> -------------------------
> cuncta stricte discussurus
>
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-- 
Chuck Cleland, Ph.D.
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Received on Sun 30 Mar 2008 - 21:47:39 GMT

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