Re: [Orgmode][babel] noweb does not work (as expected)

[Thomas S. Dye]

On Nov 8, 2009, at 9:38 PM, Torsten Wagner wrote:

> Hi Tom,
>
> If I try to use the noweb way, I always got error messages which  
> tells me that
> org-babel can not read the result correctly
>
> > #+srcname: r-load-libraries
> > #+begin_src R
> >   library(RMySQL)
> >   library(reshape)
> >   library(xtable)
> > #+end_src
>
>
> As I see you do not use any special header here which means results  
> is set to
> value, right? However, there is no special return line to org-babel  
> either. In
> my understanding and according to my error messages  library(xtable)  
> would be
> evaluated as the result of this block...
>
> However this results in error messages at least for python.
>
> Which org-babel version due you use (which branch)?
>
> Maybe you or someone else can bring some more light into  
> this :results topic.
> I somehow miss the option :results none to avoid any results which  
> should be
> useful if the source code block is just a piece of a bigger  
> arrangement. For
> literate programming and RR it might be essential to spread blocks  
> over the
> file which will be tangled together (by tangle or a noweb block).  
> However not
> all need provide a result but just need to run in the same session.  
> Maybe just
> the last block of such an arrangement will come up with a result  
> suitable for
> org-babel.
>
> Actually I prefer the idea of :noweb instead of tangle, which seems  
> to me more
> flexible and faster.
>
> Just need to get it running
>
> Thanks
>
> Torsten

Hi Torsten,

It's not clear to me what outcome you desire.  Tangling should result  
in a source file that can serve as input to a compiler or  
interpreter.  The combination of :noweb and :session lets you write  
literate programs that are sent directly to an interpreter, which  
presumably creates some useful output along the way (my example makes  
some graphs after a lot of data reshaping), but might be used just to  
set up an environment in the interpreter, which then can be  
manipulated directly in the session buffer.

I presumed that your reference to makefile meant that you were heading  
for the :noweb, :session route.  I find this useful because I can  
query the state of variables in the session and put the results in a  
LaTeX source block. Of course, the same thing would be possible to  
insert the results into the org file.

I'm using the version of org-babel that comes with org-mode version  
6.32trans.  I think I last updated about a week ago.  I'm not  
competent to work at the bleeding edge.  Besides that, I find the org- 
babel distributed with org-mode to be mature for such a young piece of  
software, and it does pretty much everything I ask it to do.

HTH,
Tom