Re: :session question

[Rainer M Krug <r.m.krug@gmail.com>]

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On 27/03/13 13:18, Andreas Röhler wrote:
> Am 27.03.2013 12:48, schrieb Nick Dokos:
>> 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
>> 
>> 
> 
> Okay, so the :session argument must not be repeated?
> 
> i.e. doesn't look like a session, resp. not a named session
> 
>>>>>> #+begin_src R x <- 1 x #+end_src
> 
> 
> Once a named session "org-R" is started all non-sessioned source goes there? Looks like a
> broken namespace.

Isn't it the same with all header arguments? when they are set file wide, they are used for the
source block unless specified otherwise.

Rainer

> 
> 
> 


- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys.
(Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

Tel :       +33 - (0)9 53 10 27 44
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