Thank you all for the help! LMH, Yes I would like to see the alternative. I am using this for a large data set and if the alternative is more efficient than this then I would be happy.
On Tue, Sep 22, 2020 at 6:25 PM Bert Gunter <bgunter.4...@gmail.com> wrote: > > To be clear, I think Rui's solution is perfectly fine and probably better > than what I offer below. But just for fun, I wanted to do it without the > lapply(). Here is one way. I think my comments suffice to explain. > > > ## which are the non "_" indices? > > wh <- grep("_",F1$text, fixed = TRUE, invert = TRUE) > > ## paste "_." to these > > F1[wh,"text"] <- paste(F1[wh,"text"],".",sep = "_") > > ## Now strsplit() and unlist() them to get a vector > > z <- unlist(strsplit(F1$text, "_")) > > ## now cbind() to the data frame > > F1 <- cbind(F1, matrix(z, ncol = 2, byrow = TRUE)) > > F1 > ID1 ID2 text 1 2 > 1 A1 B1 NONE_. NONE . > 2 A1 B1 cf_12 cf 12 > 3 A1 B1 NONE_. NONE . > 4 A2 B2 X2_25 X2 25 > 5 A2 B3 fd_15 fd 15 > >## You can change the names of the 2 columns yourself > > Cheers, > Bert > > Bert Gunter > > "The trouble with having an open mind is that people keep coming along and > sticking things into it." > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > > On Tue, Sep 22, 2020 at 12:19 PM Rui Barradas <ruipbarra...@sapo.pt> wrote: >> >> Hello, >> >> A base R solution with strsplit, like in your code. >> >> F1$Y1 <- +grepl("_", F1$text) >> >> tmp <- strsplit(as.character(F1$text), "_") >> tmp <- lapply(tmp, function(x) if(length(x) == 1) c(x, ".") else x) >> tmp <- do.call(rbind, tmp) >> colnames(tmp) <- c("X1", "X2") >> F1 <- cbind(F1[-3], tmp) # remove the original column >> rm(tmp) >> >> F1 >> # ID1 ID2 Y1 X1 X2 >> #1 A1 B1 0 NONE . >> #2 A1 B1 1 cf 12 >> #3 A1 B1 0 NONE . >> #4 A2 B2 1 X2 25 >> #5 A2 B3 1 fd 15 >> >> >> Note that cbind dispatches on F1, an object of class "data.frame". >> Therefore it's the method cbind.data.frame that is called and the result >> is also a df, though tmp is a "matrix". >> >> >> Hope this helps, >> >> Rui Barradas >> >> >> Às 20:07 de 22/09/20, Rui Barradas escreveu: >> > Hello, >> > >> > Something like this? >> > >> > >> > F1$Y1 <- +grepl("_", F1$text) >> > F1 <- F1[c(1, 2, 4, 3)] >> > F1 <- tidyr::separate(F1, text, into = c("X1", "X2"), sep = "_", fill = >> > "right") >> > F1 >> > >> > >> > Hope this helps, >> > >> > Rui Barradas >> > >> > Às 19:55 de 22/09/20, Val escreveu: >> >> HI All, >> >> >> >> I am trying to create new columns based on another column string >> >> content. First I want to identify rows that contain a particular >> >> string. If it contains, I want to split the string and create two >> >> variables. >> >> >> >> Here is my sample of data. >> >> F1<-read.table(text="ID1 ID2 text >> >> A1 B1 NONE >> >> A1 B1 cf_12 >> >> A1 B1 NONE >> >> A2 B2 X2_25 >> >> A2 B3 fd_15 ",header=TRUE,stringsAsFactors=F) >> >> If the variable "text" contains this "_" I want to create an indicator >> >> variable as shown below >> >> >> >> F1$Y1 <- ifelse(grepl("_", F1$text),1,0) >> >> >> >> >> >> Then I want to split that string in to two, before "_" and after "_" >> >> and create two variables as shown below >> >> x1= strsplit(as.character(F1$text),'_',2) >> >> >> >> My problem is how to combine this with the original data frame. The >> >> desired output is shown below, >> >> >> >> >> >> ID1 ID2 Y1 X1 X2 >> >> A1 B1 0 NONE . >> >> A1 B1 1 cf 12 >> >> A1 B1 0 NONE . >> >> A2 B2 1 X2 25 >> >> A2 B3 1 fd 15 >> >> >> >> Any help? >> >> Thank you. >> >> >> >> ______________________________________________ >> >> R-help@r-project.org 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. >> >> >> > >> > ______________________________________________ >> > R-help@r-project.org 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. >> >> ______________________________________________ >> R-help@r-project.org 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. ______________________________________________ R-help@r-project.org 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.