Hi!
I don't really understand your goal, but if you want to extract the row
names,
rownames(a[which(a[,3] < 8), ])
does it.
But I think you've already tried it. Maybe it's just me...
HTH
Ivan
Le 9/3/2010 15:08, syrvn a écrit :
> Hi,
>
> the R code:
>
> a<- matrix(c(1,5,4,3,7,10,34,4,3,8,6,5,12,17,45,3,2,45,46,47,3,4,22,12,21),
> nrow=5)
> rownames(a)<- c("a","b","c","d","e")
> a
> a[which(a[,3]< 8), ]
> a[which(a[,3]< 6), ]
>
>
> produces the following output:
>
>> a
> [,1] [,2] [,3] [,4] [,5]
> a 1 10 6 3 3
> b 5 34 5 2 4
> c 4 4 12 45 22
> d 3 3 17 46 12
> e 7 8 45 47 21
>
>> a[which(a[,3]< 8), ]
> [,1] [,2] [,3] [,4] [,5]
> a 1 10 6 3 3
> b 5 34 5 2 4
>
>> a[which(a[,3]< 6), ]
> [1] 5 34 5 2 4
>
>
> I actually thought it must be rather easy to somehow extract the row name
> when the result is just a vector as in the second example and not a matrix.
> I tried several ways but without any success.
>
> Any advice?
> Best,
> syrvn
>
>
--
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
[email protected]
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