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Re: [O] [babel] Trouble with :cache yes


From: Rainer M Krug
Subject: Re: [O] [babel] Trouble with :cache yes
Date: Wed, 23 Mar 2011 07:46:39 +0100

On Wed, Mar 23, 2011 at 3:50 AM, Eric Schulte <address@hidden> wrote:
> Hi Ken,
>
> In order for caching to work, the results of the code block must exist
> in the org-mode file.  For example, the following code block will be
> evaluated when triggered either interactively or during export
>
> #+begin_src emacs-lisp :cache yes
>  (+ 2 2)
> #+end_src
>
> alternately, this block will not be evaluated when triggered either
> interactively or on export, because the cached results are present
>
> #+begin_src emacs-lisp :cache yes
>  (+ 2 2)
> #+end_src
>
> #+results[9b77429d6cea71daf37e21ee09170810b9905066]:
> : 4
>
> In your example, for the code block to not be evaluated as part of the
> export process, you must first evaluate it manually within the Org-mode
> file, leaving the results (with the hash tag) saved in the Org-mode
> file.

I will chime in here, because I had a similar problem.
This does not work for me. When I evaluate manually (C-c c) I get the following:

* test
#+source: testcache
#+begin_src R :cache yes :exports both :results output
  dat <-  matrix(runif(12), 3, 4)
  print(dat)
#+end_src

#+results[cad298135e53df633545d6a32a8b2aab5201721c]: testcache
:           [,1]      [,2]      [,3]      [,4]
: [1,] 0.4470891 0.2016197 0.1383083 0.6214485
: [2,] 0.1598936 0.3819967 0.3527698 0.5124687
: [3,] 0.3040325 0.5906898 0.1611272 0.1702849

Which I saved (just to be save).

When exporting to a pdf, I get the following matrix in the pdf:

          [,1]        [,2]     [,3]      [,4]
[1,] 0.5626863 0.8397120 0.9886886 0.2233873
[2,] 0.8697064 0.1101432 0.1372992 0.4114674
[3,] 0.3548678 0.5658843 0.1608864 0.5809167

And it is different after each export. So it seems that the code block
*is* actually evaluated, despite of the cached info.

Rainer


>
> Best -- Eric
>
> <address@hidden> writes:
>
>> Hi,
>>
>> I'm having some trouble getting ":cache yes" to behave the way I think
>> it's supposed to.  As a test, I have a simple example containing just a
>> title and one source block:
>>
>> #+source: testcache
>> #+begin_src R :cache yes :exports both :results output
>> dat <-  matrix(runif(12), 3, 4)
>> print(dat)
>> #+end_src
>>
>>
>> If I export this document to HTML (C-c C-e b), Emacs asks me "Evaluate
>> this R code block (testcache) on your system?"  If I say 'y' it
>> re-evaluates, if I say 'n' it doesn't, so it doesn't seem like there's any
>> role that caching gets to play here.
>>
>> In addition, when I export the document as above, the results are not
>> saved in the original org-mode buffer, so whatever "#+results" block is
>> there (or not there) from doing C-c C-c is neither used nor overwritten -
>> and therefore the exported document contains different results than the
>> source document.
>>
>> The behavior I expected (please let me know if my expectation is
>> incorrect) was for the result of the computation to be cached in the Emacs
>> buffer when I do the first export, and for that saved result to be
>> included in the exported content for subsequent exports, until either the
>> code/inputs change or I delete the results block.
>>
>> My configuration is:
>>
>> Emacs  : GNU Emacs 23.2.50.1 (i386-apple-darwin9.8.0, NS
>> apple-appkit-949.54)
>>  of 2010-08-18 on braeburn.aquamacs.org - Aquamacs Distribution 2.1
>> Package: Org-mode version 7.5
>>
>> Thanks!
>>
>>
>> --
>> Ken Williams
>> Senior Research Scientist
>> Thomson Reuters
>> http://labs.thomsonreuters.com
>
>



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Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
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