Hi all,
I wrote a python-com program to be used within an Excel application. This
module uses the rpy functionalities! When I run the com-object from a VBA
function or procedure, I get the RuntimeError("Couldn't execute the R
interpreter R.exe") raised in the module rpy_tools.py. After a simple
debugging, I found that the problem lies in the function
" def get_R_VERSION(RHOME=None, force_exec=False): "
at line 64.
The first "if" statement in this function tries to use the registry to find
out the r_version.
====================================================================
if (not RHOME) and (sys.platform == 'win32') and (not force_exec):
try:
# Use the registry to find where R.dll is
import win32api, win32con
hkey = win32api.RegOpenKeyEx( win32con.HKEY_LOCAL_MACHINE,
"Software\\R-core\\R",
0, win32con.KEY_QUERY_VALUE )
# get the current version
rver = win32api.RegQueryValueEx( hkey, "Current Version" )[0]
print "found Rversion from the registry", rver
win32api.RegCloseKey( hkey )
except:
print "Unable to determine R version from the registry." + \
" Trying another method."
pass # failover to exec method
====================================================================
The ( not RHOME ) condition is always False. In this case the second step is
used to determine the R version by executing R.
====================================================================
if not rver:
if (not RHOME) or (not os.path.exists(RHOME)):
RHOME = get_R_HOME(force_exec)
rexec = os.path.join(RHOME, 'bin', 'R')
stat, output = getstatusoutput('"%s" --version' % rexec )
if stat or len(output)<=0:
raise RuntimeError("Couldn't execute the R interpreter" +
" `%s'.\n" % rexec )
# edd 05 Apr 2006 version = re.search("R +([0-9]\.[0-9]\.[0-9])", output)
version = re.search(" +([0-9]\.[0-9]\.[0-9])", output)
print "Getting R version by executing directly the R programm", version
if not version:
raise RuntimeError("Couldn't obtain version number from output\n"
"of `R --version'.\n")
rver = version.group(1)
====================================================================
The function call --- getstatusoutput('"%s" --version' % rexec ) --- returns
an Error and I get the Runtime error mentioned above. The problem lies I think
in the os.popen and the combination with Excel. I don't know for the moment
why.
In order to use Rpy, I just deleted the ( not RHOME ) condition and all my
programs are working well.
Is this a general problem with Windows Platform??
Any suggestion to avoid changing the rpy_tools code are welcome.
Thanks.
Fadhel
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