[R] Extract

[Bert Gunter]

As always, good point.
Here's a piped version of your code for those who are pipe
afficianados. As I'm not very skilled with pipes, it might certainly
be improved.
dat <-
      dat$string |>
         read.table( text = _, fill = TRUE, header = FALSE, na.strings = "")  |>
         (\(x)'names<-'(x,paste0("s", seq_along(x))))() |>
         (\(x)cbind(dat, x))()

-- Bert


On Sun, Jul 21, 2024 at 11:30 AM Gabor Grothendieck
<ggrothendieck using gmail.com> wrote:
>
> Fixing col.names=paste0("S", 1:5) assumes that there will be 5 columns and
> we may not want to do that.  If there are only 3 fields in string, at the most,
> we may wish to generate only 3 columns.
>
> On Sun, Jul 21, 2024 at 2:20 PM Bert Gunter <bgunter.4567 using gmail.com> wrote:
> >
> > Nice! -- Let read.table do the work of handling the NA's.
> > However, even simpler is to use the 'colnames' argument of
> > read.table() for the column names no?
> >
> >       string <- read.table(text = dat$string, fill = TRUE, header =
> > FALSE, na.strings = "",
> > col.names = paste0("s", 1:5))
> >       dat <- cbind(dat, string)
> >
> > -- Bert
> >
> > On Sun, Jul 21, 2024 at 10:16 AM Gabor Grothendieck
> > <ggrothendieck using gmail.com> wrote:
> > >
> > > We can use read.table for a base R solution
> > >
> > > string <- read.table(text = dat$string, fill = TRUE, header = FALSE,
> > > na.strings = "")
> > > names(string) <- paste0("S", seq_along(string))
> > > cbind(dat[-3], string)
> > >
> > > On Fri, Jul 19, 2024 at 12:52 PM Val <valkremk using gmail.com> wrote:
> > > >
> > > > Hi All,
> > > >
> > > > I want to extract new variables from a string and add it to the dataframe.
> > > > Sample data is csv file.
> > > >
> > > > dat<-read.csv(text="Year, Sex,string
> > > > 2002,F,15 xc Ab
> > > > 2003,F,14
> > > > 2004,M,18 xb 25 35 21
> > > > 2005,M,13 25
> > > > 2006,M,14 ac 256 AV 35
> > > > 2007,F,11",header=TRUE)
> > > >
> > > > The string column has  a maximum of five variables. Some rows have all
> > > > and others may not have all the five variables. If missing then  fill
> > > > it with NA,
> > > > Desired result is shown below,
> > > >
> > > >
> > > > Year,Sex,string, S1, S2, S3 S4,S5
> > > > 2002,F,15 xc Ab, 15,xc,Ab, NA, NA
> > > > 2003,F,14, 14,NA,NA,NA,NA
> > > > 2004,M,18 xb 25 35 21,18, xb, 25, 35, 21
> > > > 2005,M,13 25,13, 25,NA,NA,NA
> > > > 2006,M,14 ac 256 AV 35, 14, ac, 256, AV, 35
> > > > 2007,F,11, 11,NA,NA,NA,NA
> > > >
> > > > Any help?
> > > > Thank you in advance.
> > > >
> > > > ______________________________________________
> > > > R-help using 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.
> > >
> > >
> > >
> > > --
> > > Statistics & Software Consulting
> > > GKX Group, GKX Associates Inc.
> > > tel: 1-877-GKX-GROUP
> > > email: ggrothendieck at gmail.com
> > >
> > > ______________________________________________
> > > R-help using 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.
>
>
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com