Dears in R :i have this code in R: # this for do not work true (i tried )out<-read.csv("outbr.csv")?truth<-out[,seq(1,2)]truth<-cbind(as.character(truth[,1]),as.character(truth[,2])? ? ? ? ? ? ?,as.data.frame(rep(0,,dim(out)[1])));for (j in 1:2) {? for (i in 1:20) {? ??truth[(truth[,1]== truth[j,i] & truth[,2]== truth[j,i+1]) |?? ? ? ? (truth[,1]== truth[j+1,i] & truth[,2]== truth[j+1,i+1]),3]<-1?? } } #truth<-out[,seq(1,2)]#truth<-cbind(as.character(truth[,1]),as.character(truth[,2])? #? ? ? ? ? ?,as.data.frame(rep(0,,dim(out)[1])));#truth[(truth[,1]=="G2" & truth[,2]=="G1") | (truth[,1]=="G1" & truth[,2]=="G2"),3]<-1? ##########################################################################3 I have file have two columns? . data in this file is text just (G1,G2,G3? to G154). one element? can repeat, no problem ,so? we have 23562 rows in two columns (for 154 elements) like : Column1? ?column2? ? ?column3?? G1? ? ? ? ? ? ? ? ?G4? ? ? ? ? ? 0 G4? ? ? ? ? ? ? ? ?G6? ? ? ? ? ? 0 G100? ? ? ? ? ?G7? ? ? ? ? ? ?1G7? ? ? ? ? ? ? G100? ? .? ? ?1.? ? ? ? ? ? ? ? ? ? ? ..? ? ? ? ? ? ? ? ? ? ? ?.?I want to make third column (1 or 0) based on this condition: IF? truth[,1]==?G1? & truth[,2]==?G2? | truth[,1]==?G2? & truth[,2]==?G1? <-1.then In the third column write 1 otherwise write 0.G1 and G2? just exampl? (indeed? i want test If two each elements? ?has a reciprocal relationship(G1 to G2 and G2 to G1or not) Best regHesham? [[alternative HTML version deleted]]