A further tip:
subset(as.data.frame(xtabs( ~. , dat )), Freq != 0 )
Comes very close to generating output along the lines of what
'sort | uniq -c'
provides (if this is what was wanted rather than rle() ) and works for
multiple columns of data. The count becomes the last column (labelled
'Freq'); it is trivial to reorder columns if needed.
HTH,
Chuck
On Wed, 21 Nov 2007, Henrique Dallazuanna wrote:
See ?table function.
On 21/11/2007, Alexy Khrabrov <[EMAIL PROTECTED]> wrote:
Is there an R analog of the Unix command uniq -c:
http://en.wikipedia.org/wiki/Uniq
Given an array x, uniq -c replaces each contiguous subsequence of
identical numbers with a tuple (count, number). E.g.
$ cat > usample
10
10
9
8
8
7
7
7
6
3
1
1
1
0
$ uniq -c usample
2 10
1 9
2 8
3 7
1 6
1 3
3 1
1 0
Cheers,
Alexy
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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