I have ran
import subprocess
print subprocess.check_output("pwd")
print r.eval("system('pwd')")
print subprocess.check_output("pwd")
in SageNB, SageMathCell, and SageMathCloud. The result always is: the
middle one gives a different directory for R than the other two for Sage
(OK, in the cloud I had to put the worksheet in a subfolder to make them
different). Why is that the case? What if I want to use files between
different systems? (Like I want to save "plot.png" in R.) Looking at the
code for R interface, it does not seem to be specific to R, although I
didn't try other interfaces. Shouldn't the working directory be the same
for all interfaces including "the main one", at least when I didn't try to
change it explicitly?
SageNB uses different tmp directory for each cell execution. There is
probably no point in adjusting to it in Sage. But the cell server uses a
specific tmp directory for the whole session (in case of interacts/linked
cells) and the cloud sensibly uses the directory of the worksheet as the
starting one. Interfaces should be started there as well and I think it
should be taken care of by Sage, not interfaces.
Thank you,
Andrey
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