[R] matrix manipulation problem
Charles C. Berry
cberry at tajo.ucsd.edu
Wed Sep 2 01:37:48 CEST 2009
On Tue, 1 Sep 2009, Gregory Gentlemen wrote:
> Dear fellow R-users,
>
> Say we have a matrix x, defined as follows
>
> set.seed(50)
> x <- matrix(rbinom(100*5,1, p=0.75),nrow=100, ncol=5)
>
> Now the interpretation of x is that each for of x is actually a sequence
> of length 5, and i would like to transform x in such a way that I can
> describe the frequencies of sequences observed among the 100. How can I
> do this efficiently?
If I understood the previous para:
as.data.frame( xtabs( ~. , as.data.frame( x ) ) )
HTH,
Chuck
>
> Thanks for any assistance!
> Greg
>
>
>
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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