Hi Ana, Not too hard, but your example has all the "marker" fields in common. So using a sample that will show the expected result:
neu1<-read.table(text="Chr BP Marker MAF A1 A2 Direction pValue N 1 100000012 1:100000012:G:T 0.229925 T G + 0.650403 1594 1 100000827 1:100000827:C:T 0.287014 T C + 0.955449 1594 1 100002713 1:100002713:C:T 0.097867 T C - 0.290455 1594 1 100002882 1:100002882:T:G 0.287014 G T + 0.955449 1594 1 100002991 1:100002991:G:A 0.097867 A G - 0.290455 1594 1 100004726 1:100004726:G:A 0.132058 A G + 0.115005 1594", header=TRUE,stringsAsFactors=FALSE) nep1<-read.table(text="Chr BP Marker MAF A1 A2 Direction pValue N 1 100000012 1:100000012:G:T 0.2300430 T G - 0.1420030 1641 1 100000827 1:100000827:C:T 0.2867150 T C - 0.2045580 1641 1 100002713 1:100002713:C:T 0.0975015 T C - 0.0555507 1641 1 100002882 1:100002882:T:G 0.2867150 G T - 0.2045580 1641 1 100002991 1:100002991:G:A 0.0975015 A G - 0.0555507 1641 1 100004726 1:100004727:G:A 0.1325410 A G - 0.8725660 1641", header=TRUE,stringsAsFactors=FALSE) ret1<-read.table(text="Chr BP Marker MAF A1 A2 Direction pValue N 1 100000012 1:100000012:G:T 0.2322760 T G - 0.230383 1608 1 100000827 1:100000827:C:T 0.2882460 T C - 0.120356 1608 1 100002713 1:100002713:C:T 0.0982587 T C - 0.272936 1608 1 100002882 1:100002882:T:G 0.2882460 G T - 0.120356 1608 1 100002991 1:100002992:G:A 0.0982587 A G - 0.272936 1608 1 100004726 1:100004727:G:A 0.1340170 A G - 0.594538 1608", header=TRUE,stringsAsFactors=FALSE) # merge the three data frames on "Marker" nn1<-merge(neu1,nep1,by="Marker") nn2<-merge(nn1,ret1,by="Marker") # get the common "Marker" strings Marker3<-nn2$Marker # subset all three data frames on Marker3 neu2<-neu1[neu1$Marker %in% Marker3,] nep2<-nep1[nep1$Marker %in% Marker3,] ret2<-ret1[ret1$Marker %in% Marker3,] Jim On Tue, Jun 2, 2020 at 7:50 AM Ana Marija <[email protected]> wrote: > > Hello, > > I have 3 data frames which have about 3.4 mill lines (but they don't have > exactly the same number of lines)...they look like this: > ... > Is there is a way to create another 3 data frames, say neu2, nep2, ret2 > which would only contain lines that have the same entries in Marker column > for all 3 data frames? > > Thanks > Ana > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see 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.
