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

From: Daniel Malter <daniel_at_umd.edu>
Date: Sun, 30 Mar 2008 20:39:43 -0400

 

Thanks to all who responded so quickly.



cuncta stricte discussurus

-----Ursprüngliche Nachricht-----
Von: Chuck Cleland [mailto:ccleland_at_optonline.net] Gesendet: Sunday, March 30, 2008 5:45 PM An: Daniel Malter
Cc: r-help_at_stat.math.ethz.ch
Betreff: Re: [R] maximum of identical elements in a vector

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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--
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Received on Mon 31 Mar 2008 - 00:43:51 GMT

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