[BioC] comparing data frames

[John Zhang]

>I have two data frames with a name column containing affy probeset ids. I would 
like to pull out the ids (just the ids) which are common in both data frames. 
(Actually, I could just have to character vectors and would like to print the 
common elements).
>
>I tried this approach:
>
>for (elx in x) {for (ely in y) {if (elx==ely) print(ely)}}
>
>x, y : character vectors

Would this work for you:


> d1 <- data.frame(matrix(1:20, ncol = 4))
> d2 <- data.frame(matrix(3:22, ncol = 4))
> tt <- intersect(d1[,1], d2[,1])
> d1[d1[,1] %in% tt,] 



>
>This prints out the correct result but I am not able to assign the resulting 
probesets and it also seems quite an inelegant solution.
>
>Thank you for your help.
>
>Juerg Straubhaar
>UMass Med School
>
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Jianhua Zhang
Department of Biostatistics
Dana-Farber Cancer Institute
44 Binney Street
Boston, MA 02115-6084