Is this what you want:

> x <- data.frame(n=sample(10, n, TRUE), text=sample(LETTERS, n, TRUE))
> table(x$text, x$n)

     1  2  3  4  5  6  7  8  9 10
  A  6  5  2  0  8  1  5  3  6  4
  B  2  2  5  2  2  7  5  4  4  5
  C  7  4  6  4  3  6  3  6  5  4
  D  9  5  1  6  3  1  3  2  6  3
  E  2  6  4  3  3  5  2  7  6  3
  F  6  5  3  5  3  5  1  2  2 10
  G  4  4  2  5  5  3  2  7  3  3
  H  4  4  4  5  3  3  3  6  3  4
  I  9  3  6  1  4  4  3  4  3  4
  J  4  7  3  4  3  3  4  1  2  5
  K  2  5  5  3  3  6  9  6  5  3
  L  3  3  5  4  3  3  3  3  5  5
  M  3  9  2  3  2  0  2  3  5  6
  N  4  1  0  5  8  4  4  3  6  2
  O  3  4  3  4  8  4  2  5  5  4
  P  3  6  2  6  4  4  3  4  3  6
  Q  5  2  2  5  3  3  0  2  5  4
  R  1  5  6  4  5  4  2  2  4  4
  S  6  2  4  2  1  7  0  1  1  2
  T  4  3  1  7  2  3  4  1  8  1
  U  4  5 11  8  3  2  5  3  4  5
  V  6  3  1  1  1  0  2  5  5  3
  W  3  5  1  4  4  5  6  3  4  2
  X  5  4  3  5  5  6  3  3  3  6
  Y  6  6  6  3  2  1  3  4  4  1
  Z  3  6  1  5  6  1  8  1  3  4
>


On Fri, May 8, 2009 at 4:48 AM, Erika Ahl <erika.ahl@gmail.com> wrote:

> Hi all,
>
> I have a relative large amount (several thousand rows, but a small
> amount of unique objects) of data in a format like this:
>
> 1       text_string
> 1       text_string
> 1       text_string
> 2       text_string
> 2       text_string
> 3       text_string
> 3       text_string
> 3       text_string
> 3       text_string
> 3       text_string
> .
> .
> .
> n       text_string
>
> I want to create an n x p matrix, n objects (=40) and p unique text
> strings. Nij is number of occurrences of a text string j in object i.
>
>
> What is the most efficient way of creating this matrix?
>
> Best regards,
>
> Erika Ahl
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?

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