[R] Where the data file is stored?

[David Winsemius]

On Aug 12, 2010, at 11:51 AM, Stephen Liu wrote:

> Hi Barry,
>
>
> Following 2 commands are useful to me;
>> row
>> .names(subset(file.info(list.files(getwd(),full.name=TRUE)),isdir))
> showing directories.
>
>> row.names(subset(file.info(list.files(getwd(),full.name=TRUE)),! 
>> isdir))
> showing files
>
>
> What is "!" for?  TIA

?"!"

(learn to use R help facilities!)

>
>
> B.R.
> Stephen L
>
>
>
>
> ----- Original Message ----
> From: Barry Rowlingson <b.rowlingson at lancaster.ac.uk>
> To: Stephen Liu <satimis at yahoo.com>
> Cc: r-help at r-project.org
> Sent: Thu, August 12, 2010 8:05:10 PM
> Subject: Re: [R] Where the data file is stored?
>
> On Thu, Aug 12, 2010 at 12:37 PM, Stephen Liu <satimis at yahoo.com>  
> wrote:
>> ----- Original Message ----
>>
>> From: Alain Guillet <alain.guillet at uclouvain.be>
>> To: Stephen Liu <satimis at yahoo.com>
>> Cc: r-help at r-project.org
>> Sent: Thu, August 12, 2010 5:28:32 PM
>> Subject: Re: [R] Where the data file is stored?
>>
>>> You can find your current working directory with the getwd()  
>>> function.
>>
>>
>> Hi Alain,
>>
>>
>> Thanks for your advice.
>>
>>
>>> getwd()
>> [1] "/home/userA"
>>
>>
>>> list.files(getwd())
>> [1] "Desktop"           "Documents"         "Downloads"
>> [4] "examples.desktop"  "last-packages.txt" "Music"
>> [7] "myR"               "petdrug.csv"       "Pictures"
>> [10] "Public"            "R"                 "Templates"
>> [13] "Videos"
>>
>>
>>> list.files(getwd(),full.name=TRUE)
>> [1] "/home/userA/Desktop"
>> [2] "/home/userA/Documents"
>> [3] "/home/userA/Downloads"
>> [4] "/home/userA/examples.desktop"
>> [5] "/home/userA/last-packages.txt"
>> [6] "/home/userA/Music"
>> [7] "/home/userA/myR"
>> [8] "/home/userA/petdrug.csv"
>> [9] "/home/userA/Pictures"
>> [10] "/home/userA/Public"
>> [11] "/home/userA/R"
>> [12] "/home/userA/Templates"
>> [13] "/home/userA/Videos"
>>
>>
>> How to show on the printout which is directory?  TIA
>
> Use file.info and check the $isdir part of the returned data frame.
> For example, to get names of only directories in your working dir, do:
>
> row.names(subset(file.info(list.files(getwd(),full.name=TRUE)),isdir))
>
> a quick modification gets you not-directories (which will be plain
> files plus special files):
>
> row.names(subset(file.info(list.files(getwd(),full.name=TRUE)),! 
> isdir))
>
> see ?file.info and ?files
>
> Barry
>
>
>
>
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David Winsemius, MD
West Hartford, CT