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...1] 30380   561 I have another list L contains , that contains some row names of matrix M str (L)  chr [1:21037] Now I want to extract the submatrix subM (21037    ,    561)  from the matrix M by matching the rownames (M) to the 21037 rownames o f L How do I do that ? Thanks and regards, Pankaj Barah   Pankaj Barah Department of Biology  Norwegian University of Science & Technology (NTNU)   Realfagbygget, N-7491 Trondheim, Norway T [[alternative HTML version deleted]]

I have two matrices A and B > dim (A) [1] 30380   104 > dim(Bt) [1] 30380    63 I want to  combine both A and B to matrix C where >dim(C) [1] 30380   167 How do I do that ? Regards, Pankaj Barah Department of Biology, Norwegian University of Science & Technology (NTNU) Realfagbygget, N-7491 [[alternative HTML version deleted]]

...000 rows (Each Row has rowname). I have 13 different  list of selected rownames (character) say 1000 each. Now I want to extract the all the columns according to the rownames in each the list. How can I do that in R ? 1 ) For a single list 2) For all the 13 list at a time  Regards, Pankaj Barah Department of Biology,  Norwegian University of Science & Technology (NTNU) [[alternative HTML version deleted]]

...4000 selected rownames from List2.  Psedocode will be something like this: match rownames(List2) with rownames(List1) extract selected matched 104 coloumns from (List1) strore in-> List3 So the resulting List3 will contain 14,000 rows and 104 coloumns. How do I do it in R ? Regards, P Barah Department of Biology, Norwegian University of Science & Technology (NTNU)  Realfagbygget, N-7491 Trondheim, Norway [[alternative HTML version deleted]]