[R] about reading files in order

lily li chocold12 at gmail.com
Thu Jun 29 23:19:54 CEST 2017


Thanks also.

On Thu, Jun 29, 2017 at 2:12 PM, Adams, Jean <jvadams at usgs.gov> wrote:

> 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/posti
>> ng-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/posti
>> ng-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>

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