[R] about reading files in order

[Adams, Jean]

Thanks for that answer.
I was not aware of gtools::mixedsort
<https://www.rdocumentation.org/packages/gtools/versions/3.5.0/topics/mixedsort>
function.

Jean

On Thu, Jun 29, 2017 at 2:47 PM, Henrik Bengtsson <
henrik.bengtsson at gmail.com> wrote:

> You can use:
>
> > files <- list.files(path = "folder01")
> > files <- gtools::mixedsort(files)
>
> to order the files in a "human-friendly" order rather than
> lexicographic order (which sort() provides).
>
> FYI 1; it's preferred to use file.path("folder01", list[i]) rather
> than paste('folder01',lists[i],sep='/').
>
> FYI 2; if you use list.files(path = "folder01", full.names = TRUE),
> you get the full paths rather name just the file names, i.e. you don't
> have to use file.path().
>
> /Henrik
>
> On Thu, Jun 29, 2017 at 12:04 PM, lily li <chocold12 at gmail.com> wrote:
> > Hi R users,
> > I have a question about opening the txt files and putting them into a
> > matrix. The txt files are in the folder01, while they have the name
> > file.1.txt, file.2.txt, file.3.txt, etc. There are about 200 such text
> > files. Each txt file contains one value inside. When I tried to use the
> > code below, I found that the txt files are not in order, from 1, 2, 3, to
> > 200. Rather, they are in the order 1, 10, 100, 101, etc. How to change it
> > so that they are in order? Thanks for your help.
> >
> > temp <- list.files('folder01',pattern="*.txt"
> > name.list <-lapply(paste('folder01',temp,sep='/'),read.table,head=F)
> > library(data.table)
> > files.matrix <-rbindlist(name.list)
> >
> > Also, when use the code below, how to complete it so that the values of
> the
> > files are stored in a matrix?
> > lists = list.files('folder01')
> > for (i in 1:length(lists)){
> >   file <- read.table(paste('folder01',lists[i],sep='/'),head=F)
> >   print(file)
> > }
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > PLEASE do read the posting guide http://www.R-project.org/
> posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at 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.
>
>

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