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


From: Eric Schulte
Subject: Re: [O] [babel] Trouble with :cache yes
Date: Tue, 22 Mar 2011 20:50:57 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

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.

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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