[R] paste0 in file path

[Henrik Bengtsson]

Also, the recommended way to build file paths is to use file.path(), i.e.

   file.path("C:", "temp", filename)

rather than

   paste0("C:/temp/", filename)


BTW, R provides tempdir() that gives you the temporary directory that
R prefers to use on your OS.  So, you might want to consider using:

   paste0(tempdir(), filename)

It is specific and temporary to the R session running though, so if
you want to store things across R sessions, tempdir() is not what you
want to use.

/Henrik


On Wed, Aug 31, 2016 at 8:54 AM, Uwe Ligges
<ligges at statistik.tu-dortmund.de> wrote:
>
>
> On 31.08.2016 17:50, Leslie Rutkowski wrote:
>>
>> Hi,
>>
>> I'm trying to reshape and output 8 simple tables into excel files. This is
>> the code I'm using
>>
>>   for (i in 1:8) {
>>   count <- table(mydata$ctry, mydata[,paste0("q0",i,"r")])
>>   dat <- as.data.frame(q01count)
>>
>>   wide <- reshape(dat,
>>                   timevar="Var2",
>>                   idvar="Var1",
>>                   direction="wide")
>>    write.xlsx(wide, file=paste0(i, 'C:/temp/q0',i,'r.xlsx'))
>
>
>                                   ^^
> remove the i?
>
> Best,
> Uwe Ligges
>
>
>
>>   }
>>
>> All goes well until the write.xlsx, which produces the error
>>
>> Error in .jnew("java/io/FileOutputStream", jFile) :
>>   java.io.FileNotFoundException: 1C:\temp\q01r.xlsx (The filename,
>> directory name, or volume label syntax is incorrect)
>>
>> Among other things, I'm puzzled about why a "1" is getting tacked on to
>> the
>> file path.
>>
>> Any hints?
>>
>> Thanks,
>> Leslie
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> 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.
>>
>
> ______________________________________________
> 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.