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Re: [O] [babel] howto debug #+call lines

From: Andreas Leha
Subject: Re: [O] [babel] howto debug #+call lines
Date: Mon, 08 Oct 2012 14:35:17 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (gnu/linux)

Hi Eric,

> Andreas Leha <address@hidden> writes:
>> Hi Eric,
>>> Andreas Leha <address@hidden> writes:
>>>> Hi all,
>>>> I am getting different results from the evaluation of a source block and
>>>> the evaluation of a #+call line to that block.
>>>> Therefore, my question: Is there an equivalent to
>>>> org-babel-expand-src-block (C-c C-v v) for #+call lines?
>>>> Or more general:  How do I debug #+call lines?
>>>> Regards,
>>>> Andreas
>>> Can you provide a minimal example?
>>> You could write a code block equivalent to the call line.  E.g.,
>>>     #+call: foo(bar=1)
>>> is equivalent to
>>>     #+begin_src emacs-lisp :var results=foo(bar=1)
>>>       results
>>>     #+end_src
>> Thanks for following this up.  I found the problem in my case:  The
>> header argument ':colnames yes' was missing from the call line, such that
>> the passed variables were different.  (I've fallen into that trap
>> repeatedly, but do not learn, as it seems...)
>> It would have been a lot easier to find this, if I had had the possibility
>> to do C-c C-v v on the call line to get the chance to step through the
>> (R-) code that is evaluated.  Without this, it took me some time to
>> figure things out.
>> So the question still stands: Is there the possibility to see what is
>> actually executed with a call line, similar to C-c C-v v on a source
>> block?
> There is no body to expand in a call line so C-c C-v v would have
> nothing to show.  You can however jump to the related code block and
> call C-c C-v v there.  This process could be made faster by wrapping the
> org-babel-goto-named-src-block and org-babel-expand-src-block functions
> into a single function.
>> For a small example consider:
>> ---
>> #+name: foo
>> | bar |
>> | baz |
>> | bam |
>> #+call: testblock[:var a=foo]() :colnames yes
>> #+name: testblock
>> #+begin_src R :var a=foo :colnames yes
>>   a <- a[,1]
>>   data.frame(x=a)
>> #+end_src
>> ---
>> Regards,
>> Andreas

Thanks for the confirmation, that there is no possibility to expand a
#+call line.

I know, that I can jump to the code block and expand that one (quite
fast with C-c C-v g RET C-c C-v v), but that is exactly *not* what I was
looking for.  Because then, the header arguments to the source code
block will apply instead of the header arguments to the #+call line.

I was hoping for a C-c C-v v on #+call lines, which would spare me from
modifying the source block's header arguments.  But it is not a pressing
issue, just my laziness (and bad coding perhaps).


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