Re: :session question

[Nick Dokos <nicholas.dokos@hp.com>]

Andreas Röhler <andreas.roehler@easy-emacs.de> wrote:

> Am 27.03.2013 10:27, schrieb Andreas Leha:
> > Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
> >
> >> Am 26.03.2013 16:31, schrieb Eric Schulte:
> >>> Achim Gratz <Stromeko@Nexgo.DE> writes:
> >>>
> >>>> Am 26.03.2013 13:37, schrieb Eric Schulte:
> >>>>> This can be done system wide by setting the language-specific header
> >>>>> arguments.
> >>>>
> >>>> I've yet to see an example on how to do this.
> >>>>
> >>>
> >>>       #+begin_src emacs-lisp
> >>>         (setq org-babel-default-header-args:R
> >>>               '((:session . "org-R")))
> >>>       #+end_src
> >>>
> >>>       #+RESULTS:
> >>>       | (:session . org-R) |
> >>>
> >>>       #+begin_src R
> >>>       x <- 1
> >>>       x
> >>>       #+end_src
> >>>
> >>>       #+RESULTS:
> >>>       : 1
> >>>
> >>>       #+begin_src R
> >>>       x
> >>>       #+end_src
> >>>
> >>>       #+RESULTS:
> >>>       : 1
> >>>
> >>>>
> >>
> >> Hi,
> >>
> >> this looks very confusing for me.
> >>
> >> So, what is the purpose of a named session?
> >> Understood it being a name-space, whose values don't affect the other ones.
> >> What's in python-mode a dedicated shell.
> >
> > I can't speak for python, but in R, every differently named session will
> > run within its own R process.
> >
> > The cool thing is, that I can work on file_foo.org and file_bar.org
> > simultaneously, when file_foo.org uses R-session *foo* and file_bar.org
> > uses R-session *bar*.
> >
> > [...]
> >
> > Regards,
> > Andreas
> >
> >
> >
> >
> 
> 
> Okay, that's the expected usage.
> How do you read the example displayed?
> 
> Looks like a named (:session . "org-R") affects global R namespace.
> 
> What did "org-R" say here, what might be the purpose?
> 
> Assume it should switch it on. Then "org-R" represents a boolean here?
> 

"org-R" is the name of the session. The code blocks illustrate that the
value of x (set in the first code block) is preserved and can be used
in the second (and subsequent) code blocks.

Nick