[R] rename files in R

Mon Sep 19 20:52:29 CEST 2022

 Thank you for your help. I'll check this out.Kai
    On Monday, September 19, 2022 at 11:47:11 AM PDT, Bert Gunter <bgunter.4567 using gmail.com> wrote:  

 I haven't tracked what went before, but your syntax here is totally messed up:
for (i in seq_len(nrow(total_name)))
{
  with(
    total_name[i, ], 
    {
      file.rename(total_name$orig, total_name$target)
    }
  )
}
Also, you don't need looping because file.rename is already vectorized -- you need to read the Help file more carefully. So something like this should do what you want:
with(total_name, file.rename (orig, target))
where orig and target should be character (not factor) columns in your data frame.

Cheers,Bert     
On Mon, Sep 19, 2022 at 10:38 AM Kai Yang via R-help <r-help using r-project.org> wrote:

 Hi Rui,I put original file names and target file names into data frame: total_name. I can use
file.rename("out_1.pdf", "abc_title.pdf")

to rename a single file. But I hope to use loop to complete the task. So I write  a code below:
for (i in seq_len(nrow(total_name)))
{
  with(
    total_name[i, ], 
    {
      file.rename(total_name$orig, total_name$target)
    }
  )
}     
But I got error message: 
Error in file.rename(total_name$orig, total_name$target) : 
invalid 'from' argument

I think the problem happen due to quotation problem. Do you know how to fix it?
Thanks,
Kai    On Friday, September 16, 2022 at 08:32:53 PM PDT, Rui Barradas <ruipbarradas using sapo.pt> wrote:  

 Hello,

My understanding of the problem is different, the files' first row is 
not tabular data, I might be wrong but it seems to me that it's 
something like

first row [of] file1.txt [is]:
abc.txt

file2.txt:
bed.txt

etc.

That's why the sapply loop reads one datum only and exits.

Hope this helps,

Rui Barradas

Às 02:29 de 17/09/2022, Ebert,Timothy Aaron escreveu:
> The syntax might not be quite right, but why not something like file.rename(colnames(dataframe)[1]) -- Using colnames to get the names of the columns that are in the first row, selecting the first element from colnames() and setting the file name equal to that.
> 
> Do a for loop using current file names in some folder, and save to a new folder.
> 
> Tim
> 
> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Kai Yang via R-help
> Sent: Friday, September 16, 2022 1:52 PM
> To: R-help Mailing List <r-help using r-project.org>; Rui Barradas <ruipbarradas using sapo.pt>
> Subject: Re: [R] rename files in R
> 
> [External Email]
> 
>  Hello,Here is the example:
>    file name    first row  file1.txt    abc.txt  file2.txt    bed.txt  file3.txt    gogo.txt  . . file1243.txt    last.txt
> I want to use loop because I need to read the first row information for first file, and then rename the file, then go to next file. I'm not sure if this is right way to approach my goal. Any suggestion will be appreciated. Thanks, Kai    On Friday, September 16, 2022 at 10:38:32 AM PDT, Rui Barradas <ruipbarradas using sapo.pt> wrote:
> 
>  Hello,
> 
> Please post the first row of 2 or 3 files and the expected result.
> 
> You can rename files with ?file.rename. This function is vectorized its on arguments so you do not need a loop, only the source and destination filenames. Both vectors should have the same length, if not strange things will occur including data loss.
> 
> Hope this helps,
> 
> Rui Barradas
> 
> Às 18:26 de 16/09/2022, Kai Yang via R-help escreveu:
>> Hello,I have a lot of files with not meaningful name, such as:
>> file1.txt, file2.txt ...... I need to rename them using the
>> information from the first row of the files. Now I can get the
>> information from the first row of each file. Now, I need know how to
>> rename them in R (using loop?). Thank you for your helpKai
>>
>>
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