Re: [O] [babel] Using :prologue and :epilogue with unbalanced brackets

[Rainer M Krug]

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On 01/20/14, 16:34 , Eric Schulte wrote:
> Rainer M Krug <address@hidden> writes:
> 
>> Hi
>>
>> I would like to use :prologue and :epilogue to enclose the code block
>> in a local({}) block, i.e.
>>
>> * test
>> #+begin_src R :prologue local({   :epilogue })
>> qwerty <- "test"
>> #+end_src
>>
> 
> I tried wrapping the prologue and epilogue values in quotes so that they
> would be interpreted as strings, and I no longer see the problem you
> describe and it works in a session, but I get a different R issues
> outside of a session.

Agreed - 

* test
#+begin_src R  :results output :prologue "local({" :epilogue "})" :session
  cat("Test")
#+end_src

#+RESULTS:

no :session nothing happens

using :session the execution does not complete because the :epilogue is not 
appended.


* test 2
#+begin_src R  :results output :prologue "cat(1, '###\n')" :epilogue "cat(2, 
'###\n')" :session
  cat("Test\n")
#+end_src

#+RESULTS:
: 1 ###
: Test

works under :session and without

but 
* test 2
#+begin_src R  :results output :prologue "{cat(1, 2 )"   :epilogue "cat(2, 3)}" 
:session
  cat("Test\n")
#+end_src

works only without :session as R is waiting for the "}" which is in the 
:epilogue but which is not added.

Cheers,

Rainer


> 
> Best,
> 
>>
>> But the problem seems to be the unbalanced brackets, and everything is
>> passed on as the prologue, as I get the error:
>>
>> Error: unexpected ':' in:
>> "{
>> local({  :"
>> Execution halted
>>
>> Can I somehow use unbalanced brackets, or is this a missing option in
>> epilogue and prologue?
>>
>> Cheers,
>>
>> 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
>> Cell:       +33 - (0)6 85 62 59 98
>> Fax :       +33 - (0)9 58 10 27 44
>>
>> Fax (D):    +49 - (0)3 21 21 25 22 44
>>
>> email:      address@hidden
>>
>> Skype:      RMkrug
> 

- -- 
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
Cell:       +33 - (0)6 85 62 59 98
Fax :       +33 - (0)9 58 10 27 44

Fax (D):    +49 - (0)3 21 21 25 22 44

email:      address@hidden

Skype:      RMkrug
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