[R] Capturing output from external executables, in windows

From: Darren Obbard <darren.obbard_at_ed.ac.uk>
Date: Wed 24 Jan 2007 - 13:22:10 GMT


Hi,

Any help on the following would be much appreciated

I wish to capture the output (currently going to console) from an external executable.

The executable is successfully run using

     system("program -switch ")

and the output printed to the DOS console.

How do I capture this output? I have tried redirecting the output to a text file, and then reading this in     

     system("program -switch > textfile.txt")
     data<-scan("textfile.txt")

But this does not seem to work (the textfile.txt is not written). It does however work if I invoke the console to be permanent

     system("cmd /K program -switch > textfile.txt")
     data<-scan("textfile.txt")

Unfortunately, this leaves me with an open console window I have to close manually.

Is there a way of doing this (under windows) using system( ) or some other command? It appears that pipe( ) may do it, but I cannot understand the documentation.

An example of the appropriate syntax would be an enormous help.

Thanks in advance,

Darren

Darren.Obbard@ed.ac.uk

-- 

Darren Obbard
Institute of Evolutionary Biology
Ashworth Labs
Kings Buildings
University of Edinburgh, UK

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