Re: «Macro» expansion in source blocks; code-sharing between blocks

[Andreas Kiermeier <andreas.kiermeier@gmail.com>]

Thanks Rainer,

but unfortunately this isn't working. I'm sure I'm doing something
wrong ... somewhere.

In case this makes any difference I have in the document header:

#+PROPERTY: header-args:R :session *R*
#+PROPERTY: header-args :results output graphics :exports results

I've now changed the source block header to ":exports none :eval no"
but now there really is nothing in the output.

In fact, the corresponding .tex file now contains:

\begin{table}[h]
\label{tbl:refyear}
\caption{Separation outcomes (death or any type of discharge) by
reference year.}
nil
\end{table}

and in the *Message* buffer I now have:

Evaluation of this R code-block (tbl-refyear) is disabled.
org-babel-exp processing...
Evaluation of this R code-block (tbl-refyear) is disabled.
executing Latex code block...

So, this source block really doesn't evaluated at all.

Thanks

Andreas

On 19 September 2014 18:34, Rainer M Krug <Rainer@krugs.de> wrote:
> Andreas Kiermeier <andreas.kiermeier@gmail.com> writes:
>
>> I don't think you need the ":noweb yes" as part of the setup_fu
>> header, as this block is not pulling in other materials.
>>
>> Having used this type of setup only over the last couple of days, I've
>> come up with another question. It appears that the setup_fu is
>> executed twice ... once as it's own source block (though by itself not
>> need) and once as part of the second noweb block. This isn't a problem
>> if the execution time is small, but I'm trying to create a summary
>> table in Latex format from 2 million records - so the time is
>> considerable.
>>
>
> Check out the :eval header argument: if you use
>
> ,----
> | #+BEGIN_SRC R :eval never :exports none
> `----
>
> this block is never executed - this should work. There are also other
> values for :eval. From the help:
>
> ,----
> | 14.8.2.25 `:eval'
> | .................
> |
> | The `:eval' header argument can be used to limit the evaluation of
> | specific code blocks.  The `:eval' header argument can be useful for
> | protecting against the evaluation of dangerous code blocks or to ensure
> | that evaluation will require a query regardless of the value of the
> | `org-confirm-babel-evaluate' variable.  The possible values of `:eval'
> | and their effects are shown below.
> |
> | `never or no'
> |      The code block will not be evaluated under any circumstances.
> |
> | `query'
> |      Evaluation of the code block will require a query.
> |
> | `never-export or no-export'
> |      The code block will not be evaluated during export but may still
> |      be called interactively.
> |
> | `query-export'
> |      Evaluation of the code block during export will require a query.
> |
> |    If this header argument is not set then evaluation is determined by
> | the value of the `org-confirm-babel-evaluate' variable see *Note Code
> | evaluation security::.
> `----
>
> Cheers,
>
> Rainer
>
>
>> My two blocks (with some code removed for simplicity) are as follow:
>>
>> #+NAME: tbl-refyear
>> #+BEGIN_SRC R :results silent :exports none
>>   latex(tabular( <code remove>  ))
>> #+END_SRC
>>
>> #+BEGIN_SRC latex :noweb yes
>> \begin{table}[h]
>> \label{tbl:refyear}
>> \caption{Separation outcomes (death or any type of discharge) by
>> reference year.}
>> <<tbl-refyear()>>
>> \end{table}
>> #+END_SRC
>>
>> I've tried :cache yes as part of the tbl-refyear source block, but
>> that didn't stop if from being run twice. Am I missing a suitable
>> header argument?
>>
>> This is the only way I could find to wrap the latex table (which has
>> some complex formatting and hence why I've used it over just producing
>> a table) in a float with a caption (though I still can't properly
>> reference the label when I export to a PDF file).
>>
>> Any thought would be greatly appreciated. TIA!
>>
>> Andreas