Indeed, I presume something changed.  I would get an error message with the file(description=.....) command.  The mystery is that everything worked fine before.  Thanks for your comments.  john karon

From: Uwe Ligges-3 [via R] 
Sent: Monday, December 16, 2013 8:44 AM
To: J Karon 
Subject: Re: Invalid connection error message when trying to write a file

I guess your problem is that you cannot write toplevel into "c:\" with 
your permissions? 

Best, 
Uwe Ligges 


On 16.12.2013 16:40, John Karon wrote: 

> Thanks for pointing out my error after specifying the destination in the 
> file(  ) function.  What you proposed also did not work. 
> It turns out the solution is to give the file name but not include the 
> path; the resulting file is written in the working directory. 
> The mystery is that including the path had previously work. 
> John Karon 
> 
> -----Original Message----- From: Uwe Ligges 
> Sent: Sunday, December 15, 2013 12:30 PM 
> To: John Karon ; [hidden email] 
> Subject: Re: [R] Invalid connection error message when trying to write a 
> file 
> 
> 
> 
> On 15.12.2013 20:13, John Karon wrote: 
>> The response below asks what I actually did. 
>> 
>> I defined a function (details omitted; it computes the data frame 
>> LRtest.out); arguments include "path\\filename.csv" to which I want to 
>> write a data frame using write.csv(  ).  Repeated executions of the 
>> function (without the file(  ) and close(  ) instructions) were 
>> successful until 2 days ago, when I received the error message below.  I 
>> simplified the code to write a file and received the error message below 
>> (same message as before) in response to the commands 
>> 
>> zz<-file(description="c:\\LRtest.txt","w") 
>> write.table(LRtest.out, file="c:\\LRtest.txt", sep="\t") 
>> close(zz) 
> 
> Wrong, *either* use 
> 
> write.table(LRtest.out, file="c:\\LRtest.txt", sep="\t") 
> 
> or 
> 
> zz <- file(description="c:\\LRtest.txt","w") 
> write.table(LRtest.out, file=zz, sep="\t") 
> close(zz) 
> 
> Best, 
> Uwe Ligges 
> 
> 
> 
> 
> 
> 
> 
>> 
>> Error in file(description = "c:\\LRtest.txt", "w") : 
>>   cannot open the connection 
>> In addition: Warning message: 
>> In file(description = "c:\\LRtest.txt", "w") : 
>>   cannot open file 'c:\LRtest.txt': Permission denied 
>> 
>> This happens whether there is no previous file with that name or an 
>> essentially empty file with that name.  In previous executions of code 
>> with a path to a folder, executing the file(  )  command would create an 
>> empty file.  Now no empty file is created.  The problem persists after 
>> rebooting the computer. 
>> 
>> I also tried writing to the clipboard (description ="clipboard" in the 
>> file(  ) command); that was unsuccessful, with file="clipboard" or no 
>> file statement in the write.table(  ) command (Word showed there was 
>> something to paste, but pasting into an empty Word document did not put 
>> text into the document; with no file statement, the data frame was 
>> written to the console). 
>> 
>> I question whether there is a setting that forbids writing to a file. 
>> Information on putting the data frame on the clipboard would also help. 
>> Thanks for any help.  John Karon 
>> 
>> -----Original Message----- From: Uwe Ligges 
>> Sent: Saturday, December 14, 2013 10:05 AM 
>> To: J Karon ; [hidden email] 
>> Subject: Re: [R] Invalid connection error message when trying to write a 
>> file 
>> 
>> 
>> 
>> On 13.12.2013 20:11, J Karon wrote: 
>>> I get an invalid connection method error message when trying to write 
>>> an R 
>>> object from a user-defined function to my hard drive (running Windows 7) 
>>> using write.csv.  I have previously not had this problem with the same 
>>> user-defined function.  The error message is 
>>> 
>>> Error in isOpen(file, "w") : invalid connection 
>>> In addition: Warning message: 
>>> In if (file == "") file <- stdout() else if (is.character(file)) { : 
>>>    the condition has length > 1 and only the first element will be used 
>>> 
>>> Using 
>>> zz<-file(description="path","w") 
>>> write.csv(  ) 
>>> close(zz) 
>>> 
>>> creates an empty file but yields the same error message when I execute 
>>> write.csv. 
>> 
>> 
>> Please tell us what you actually did. 
>> 
>> This works for me: 
>> 
>> zz <- file(description="path", "w") 
>> write.csv(iris, zz) 
>> close(zz) 
>> 
>> Best, 
>> Uwe Ligges 
>> 
>> ______________________________________________ 
>> [hidden email] mailing list 
>> 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. 
> 

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