Re: [O] [babel] Table as varaiables a differently proccesed by #+call lines vs. source code blocks

[Sebastien Vauban]

Hi Torsten,

Torsten Wagner wrote:
> I want to summarize the problem I found, using tables as input to source
> code blocks.
> This observation was shared with Rick and I would be glad to help fixing
> that.
>
> Within the attached file one can see a typical example.
>
> It all comes down to a differently interpretation of tables  with respect
> to horizontal line.
>
> #+TBLNAME: with-hline
> | A | B | C |
> |---+---+---|
> | 1 | 2 | 3 |
> | X | Y | Z |
>
> and
>
> #+TBLNAME: without-hline
> | A | B | C |
> | 1 | 2 | 3 |
> | X | Y | Z |
>
> will give different results being called by
>
> #+name: python-element
> #+begin_src python :var table=with-hline :exports results
>   return table[1]
> #+end_src
>
> or
>
> #+CALL: python-echo(with-hline)
>
> Please see the attached file for details.
>
> From what I was able to observe:
>
> 1. Calling a table with hline, the result of the source code block miss the
> first row. Indexing is possible only for the second and third row (in the
> given example)
>
> 2. Having no hline, the first row is available, indexing of the first row
> works too.
>
> Using a Call construct:
> 1. for a table without hline, indexing works but it does not work for a
> table with hline.
> 2. Interestingly, using the CALL functions, the type of both tables in
> python is list for the entire table, however, indexing a table with hlines,
> the type becomes NoneType whereas for a table without hline it is still of
> type list.
>
> Hope that can somehow help to get an idea what is going on.

I think the reason comes from the fact that different default header args
exist depending on the way the code is eval'ed.

See the contents of the following vars:

- `org-babel-default-header-args' for source blocks
- `org-babel-default-inline-header-args' for inline source blocks
- `org-babel-default-lob-header-args' for `#+call' lines

So, you clearly needs to add explicit values for some of your header arguments
in your call line.

Best regards,
Seb

-- 
Sebastien Vauban