[R] Ordering Filenames stored in list or vector

[BARLAS Marios 247554]

Thanks a lot for the clarifying code Mark!

Actually, I took a lazy option and after some digging around I found out the package called "naturalsort" which provides a pretty compact solution!

As a rookie, I have another question. My main interest in R is that I hope to integrate in a scripting fashion good amount of data crunching coming from electrical measurements and at the same time give me a nice visualization option all in the same tool.

Is it a proper tool for such use in your experience? So far I was using Matlab + OriginPro for treatment and visualization but now, starting my PhD I feel like I want something more "integrated"

Thanks,
Mario
________________________________________
From: Mark Sharp [msharp at TxBiomed.org]
Sent: Friday, December 04, 2015 5:25 PM
To: BARLAS Marios 247554
Cc: r-help at r-project.org
Subject: Re: [R] Ordering Filenames stored in list or vector

Mario,

I am certain there are more elegant solutions. This is an effort to make the process clear by dividing out each transformation used into separate lines.

## Start of code
library(stringi) # This is written in C and C++ (ICU library), is fast, and is well documented.
filenames <- c("Q_Read_prist#1 at 1.xls", "Q_Read_prist#1 at 10.xls",
           "Q_Read_prist#1 at 11.xls", "Q_Read_prist#1 at 12.xls",
           "Q_Read_prist#1 at 13.xls", "Q_Read_prist#1 at 14.xls",
           "Q_Read_prist#1 at 15.xls", "Q_Read_prist#1 at 16.xls",
           "Q_Read_prist#1 at 17.xls", "Q_Read_prist#1 at 18.xls",
           "Q_Read_prist#1 at 19.xls", "Q_Read_prist#1 at 2.xls",
           "Q_Read_prist#1 at 3.xls", "Q_Read_prist#1 at 4.xls",
           "Q_Read_prist#1 at 5.xls", "Q_Read_prist#1 at 6.xls",
           "Q_Read_prist#1 at 7.xls", "Q_Read_prist#1 at 8.xls",
           "Q_Read_prist#1 at 9.xls")
indx_list <- stri_split_regex(filenames, pattern = "[@.]")
indx <- sapply(indx_list, function(x) {x[[2]]})
filenames_df <- data.frame(file_name = filenames, indx = indx,
                            stringsAsFactors = FALSE)
filenames_ordered <- filenames_df[order(as.numeric(filenames_df$indx)),
                                    "file_name"]
filenames_ordered
## end of code
Mark


R. Mark Sharp, Ph.D.
Director of Primate Records Database
Southwest National Primate Research Center
Texas Biomedical Research Institute
P.O. Box 760549
San Antonio, TX 78245-0549
Telephone: (210)258-9476
e-mail: msharp at TxBiomed.org







> On Dec 4, 2015, at 4:51 AM, BARLAS Marios 247554 <Marios.BARLAS at cea.fr> wrote:
>
> Hello everyone,
>
> I am an R rookie and I'm learning as I program.
>
> I am working on a script to process a large amount of data: I read a pattern of filenames in the folder I want and import their data
>
> filenames = list.files(path, pattern="*Q_Read_prist*")
>
> myfiles = lapply(filenames, function(x) read.xlsx2(file=x, sheetName="Data", header=TRUE, FILENAMEVAR=x))
>
> The problem is that R recognizes the files in a 'non human' order.
>
> Q_Read_prist#1 at 1.xls   Q_Read_prist#1 at 1.xls
> Q_Read_prist#1 at 10.xls Q_Read_prist#1 at 10.xls
> Q_Read_prist#1 at 11.xls Q_Read_prist#1 at 11.xls
> Q_Read_prist#1 at 12.xls Q_Read_prist#1 at 12.xls
> Q_Read_prist#1 at 13.xls Q_Read_prist#1 at 13.xls
> Q_Read_prist#1 at 14.xls Q_Read_prist#1 at 14.xls
> Q_Read_prist#1 at 15.xls Q_Read_prist#1 at 15.xls
> Q_Read_prist#1 at 16.xls Q_Read_prist#1 at 16.xls
> Q_Read_prist#1 at 17.xls Q_Read_prist#1 at 17.xls
> Q_Read_prist#1 at 18.xls Q_Read_prist#1 at 18.xls
> Q_Read_prist#1 at 19.xls Q_Read_prist#1 at 19.xls
> Q_Read_prist#1 at 2.xls   Q_Read_prist#1 at 2.xls
> Q_Read_prist#1 at 3.xls   Q_Read_prist#1 at 3.xls
> Q_Read_prist#1 at 4.xls   Q_Read_prist#1 at 4.xls
> Q_Read_prist#1 at 5.xls   Q_Read_prist#1 at 5.xls
> Q_Read_prist#1 at 6.xls   Q_Read_prist#1 at 6.xls
> Q_Read_prist#1 at 7.xls   Q_Read_prist#1 at 7.xls
> Q_Read_prist#1 at 8.xls   Q_Read_prist#1 at 8.xls
> Q_Read_prist#1 at 9.xls   Q_Read_prist#1 at 9.xls
>
> I tried to order them using order or sort but it doesn' seem to work. I have had the same issue in matlab but there I have a function to re-define the order in a "correct" way.
>
> Anyone knows of a smart way to sort these guys from 1 to 19 ascending or descending?
>
> Thanks in advance,
> Mario
>
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