Re: [R] Difference between comma separated values in column

Hi, It is better to show the example data using ?dput().  Here, it is not clear whether the columns are character columns or lists. ##If it is the latter case dat1 - data.frame(V1=I(list(1:3, c(1,2,4), c(2,3,4,5))), V2= I(list(c(3,6,5), c(7,10,9), 2:5)))  dat1$V3 - mapply(`c`,mapply(`-`,

Re: [R] Difference between comma separated values in column

HI, I guess this should be a bit faster. #1st case dat1$V3 - lapply(seq_along(dat1$V2),function(i) c(dat1$V2[[i]][-1] - head(dat1$V1[[i]],-1), tail(dat1$V1[[i]],1))) #2nd case dat2$V3 - unlist(lapply(seq_along(lst1[,2]),function(i) paste(c(lst1[,2][[i]][-1] - head(lst1[,1][[i]], -1),