Re: var expansion on tangling only once per file

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

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On 11/04/12 16:15, Eric Schulte wrote:
> This is not currently possible, and any conceivable implementation would be necessarily complex
> requiring a good deal of cross-buffer coordination.

Ok - then I know why I haven't realised this before: I mover the variable definition from a header
argument to the #+PROPERTY: as I need the variable throughout the document.

> 
> Would it be possible to simply only declare the variable in a header argument applying to the
> first code block?  Using a session would keep that variables state through all subsequent code
> blocks.

Would work - but as I said above, I would have preferred to have the variable defined at the top
of the buffer. I could use though the no-expand header argument for the source blocks. At the moment,

I am putting them in a subtree and set the property for the subtree.

Thanks,

Rainer

> 
> Best,
> 
> Rainer M Krug <r.m.krug@gmail.com> writes:
> 
>> Hi
>> 
>> I have a file wide variable defined and tangle several source blockd into one file.
>> 
>> BNo the variable is expanded in each block.
>> 
>> Would it be possible to have the expansion at the beginning of the file and nod be repeated,
>> as this can cause problems?
>> 
>> The following org code
>> 
>> #+PROPERTY: tangle test.R #+PROPERTY: var TheVar=99
>> 
>> * Part one #+begin_src R :tabgle: x <- 1 #+end_src * Problem #+begin_src R y <- list( x = 1, 
>> #+end_src * Problem continued #+begin_src R x <- 3 ) #+end_src
>> 
>> results in an error in R due to the repeated "TheVar <- 99" in the list definition.
>> 
>> Org-mode version 7.8.08 (release_7.8.07.213.ge6fdf) from git this morning
>> 
>> If I remember correctly, this sneeked in quite recently.
>> 
>> Thanks,
>> 
>> 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

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