Hi, You may try:
myList <- list(structure(list(X = c("FBgn0000008", "FBgn0000014", "FBgn0000028", "FBgn0000109", "FBgn0000114", "FBgn0000120"), NAME = c("FBgn0000008", "FBgn0000014", "FBgn0000028", "FBgn0000109", "FBgn0000114", "FBgn0000120" ), MEM.SHIP = c(0.9304502, 1, 1, 1, 0.4839886, 1)), .Names = c("X", "NAME", "MEM.SHIP"), class = "data.frame", row.names = c("1", "2", "3", "4", "5", "6")), structure(list(X = c("FBgn0000251", "FBgn0001168", "FBgn0001941", "FBgn0003053", "FBgn0003159", "FBgn0000120" ), NAME = c("FBgn0000251", "FBgn0001168", "FBgn0001941", "FBgn0000028", "FBgn0003159", "FBgn0003162"), MEM.SHIP = c(0.313865, 0.8995011, 0.7485548, 0.4426997, 0.4843226, 0.655629)), .Names = c("X", "NAME", "MEM.SHIP"), class = "data.frame", row.names = c("1", "2", "3", "4", "5", "6"))) library(data.table) dt1 <- rbindlist(myList) fun1 <- function(val){duplicated(val)|duplicated(val,fromLast=TRUE)} dt1[,paste0("Col",1:2):=lapply(.SD, fun1),.SDcols=1:2] dt1 A.K. On Monday, May 19, 2014 8:50 AM, Assa Yeroslaviz <fry...@gmail.com> wrote: Hi, I have a list of 40 data.frames. I would like to identify duplicated entries in the whole list, not only in one specific data.frame, but in all 40. Here is my list: > myList [[1]] X NAME MEM.SHIP 1 FBgn0000008 FBgn0000008 0.9304502 2 FBgn0000014 FBgn0000014 1.0000000 3 FBgn0000028 FBgn0000028 1.0000000 4 FBgn0000109 FBgn0000109 1.0000000 5 FBgn0000114 FBgn0000114 0.4839886 6 FBgn0000120 FBgn0000120 1.0000000 [[2]] X NAME MEM.SHIP 1 FBgn0000251 FBgn0000251 0.3138650 2 FBgn0001168 FBgn0001168 0.8995011 3 FBgn0001941 FBgn0001941 0.7485548 4 FBgn0003053 FBgn0000028 0.4426997 5 FBgn0003159 FBgn0003159 0.4843226 6 FBgn0000120 FBgn0003162 0.6556290 I would like to know whether there are duplicated entries in the first and/or second column of all. In this list I have two duplications one is FBgn0000120 in both lines Nr. 6 and the second is FBgn0000028 in line 3 and line 4 in df1 and df2 respectively. Is there a way to do it. With unique I don't get any results. and I cannot convert the list into a data.frame, as the number of items in each df is different. Thanks Assa [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.