From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Eric Schulte" <schulte.eric@gmail.com>
Subject: Re: [babel] silent code block evaluation on export
Date: Wed, 01 Sep 2010 19:37:50 -0600
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References: <4C7D4D12.1070002@ccbr.umn.edu> <87d3sxdmqv.fsf@gmail.com>
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In-Reply-To: <87d3sxdmqv.fsf@gmail.com> (Eric Schulte's message of "Wed, 01
	Sep 2010 18:15:20 -0600")
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To: Erik Iverson <eriki@ccbr.umn.edu>
Cc: emacs-orgmode <emacs-orgmode@gnu.org>

"Eric Schulte" <schulte.eric@gmail.com> writes:

> Hi Erik,
>
> I believe that when a session is specified then all code blocks will be
> evaluated but their results will not be included in the exported output.
>

To clarify the above,

if a code block has a :session header argument, then it is assumed that
the block should be evaluated regardless of it's :export header
argument, because it could change the state of the session, so in the
following simple example the first code block is evaluated on export
despite having an :exports none header argument, and this ensure that
the value of x is set for the second code block.

--8<---------------cut here---------------start------------->8---
** :session evaluation on export
This first block is evaluated but /doesn't/ appear in export.

/:session *R* :exports none/
#+begin_src R :session *R* :exports none
  x <- 8
#+end_src

This second block /does/ appear in export.

#+begin_src R :session *R* :exports results
  x
#+end_src
--8<---------------cut here---------------end--------------->8---

Cheers -- Eric