On 08/08/2008 7:00 AM, Dobedani wrote:
Dear all,
I'm trying to invoke R from an application which I'm developing. I
have indications that the problem is specific to R. I'm able to e.g.
invoke a Python script in the same way with success, but R is giving
me problems. Last year a guy with nickname vital101 posted a message
on the Java forums website about invoking R from Java. The link to
that thread is:
http://www.java-forums.org/advanced-java/3433-external-program-execution-problems.html#post6970
Unfortunately, he did not report back whether he found a solution at
the time. As I said, I believe the problems he encountered were
specific to R. What he was doing from Java, I'm now trying to do from
C#. And I'm getting exactly the same warnings / errors back from R as
he was getting:
ARGUMENT '<' __ignored__
ARGUMENT 'test.r' __ignored__
FYI: I'm using Windows XP. If I enter the following behind the command
prompt:
C:\Progra~1\R\R-2.7.1\bin\Rterm.exe --slave < test.r
then my script test.r is dealt with correctly, but if I use DotNet
classes Process and StartInfo from the System.Diagnostics namespace,
things go wrong :-(
Does anyone understand what is going wrong here? Pls let me know
something. TIA
This is not a problem with R. When you enter a command at the command
line, it is the shell (typically CMD.EXE in Windows) that handles the
input redirection "<". R never sees that, and so R has no code to
handle it.
When you are invoking R directly, it's up to you to handle the input
redirection, since you're not using the shell. I've got no idea how to
do that in C#.
However, R does allow you to use the -f (or --file=) command line option
to take input from a file, and that's likely to do what you want.
Duncan Murdoch
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