[R] problem in loop using windows executable

[Jeff Newmiller]

My suggestion is that you provide a reproducible example, as the Posting Guide requests.

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Sent from my phone. Please excuse my brevity.

On October 29, 2014 10:20:13 AM PDT, Pedro Segurado <psegurado at isa.ulisboa.pt> wrote:
>Dear all,
>
>I am trying to develop a R script that basically uses a loop that
>includes 5
>main steps: (1) it runs a windows executable file outside R that
>requires a
>set of *.txt files using the shell function (Note: I have tried system
>and
>system(shhQuote()) and the problem remains), (2) it imports the output
>txt
>file of the executable, (3) it deletes the existing input txt files
>from the
>windows folder, (4) it uses values of the imported output file to help
>producing new tables to be used as input files to the executable and
>(5) it
>exports those tables in txt format to the windows folder.
>
>Now the problem. I am running this script in a laptop. I have change
>the
>energy saving settings to the highest performance possible, it no
>energy
>saving options at all. If I move the mouse frequently there is no
>problem,
>the whole process is not interrupted. However, if I do not move the
>mouse,
>the process stops (not always in the same loop and the same file) with
>the
>following error:
>
>Error in file(file, ifelse(append, "a", "w")) : 
>  cannot open the connection
>In addition: Warning message:
>In file(file, ifelse(append, "a", "w")) :
>  cannot open file 'nodes_29.txt': Permission denied
>
>The file "nodes_29.txt" is one of the executable input files that is
>produced in the loop, which can have the same name as previous txt
>files
>that were meanwhile deleted in previous loops (again, please note that
>the
>error is not always in the same loop number and the same file). 
>
>Any idea?
>
>Thanks!
>Pedro
>
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>and provide commented, minimal, self-contained, reproducible code.