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[O] [babel] disable :session for a code block?

From: Rainer M Krug
Subject: [O] [babel] disable :session for a code block?
Date: Sun, 23 Feb 2014 18:40:25 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (darwin)


I would like to save all in org defined variables into an R data
file. In general this works fine with the following code block:

#+begin_src R :session null :results output
dir.create("./data/", showWarnings=FALSE)

but, as I have defined a file wide session for R via 


I have to create a new session for this, which is not that nice: when I
remove a variable in org, it is still in the R environment and will
therefore be saved. Therefore my question:

what can I provide to the :session header, so that no session is used?
In other words: how can I run a single code block out-of-session when
all other are running in a session?



Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, 
UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

Tel :       +33 - (0)9 53 10 27 44
Cell:       +33 - (0)6 85 62 59 98
Fax :       +33 - (0)9 58 10 27 44

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email:      address@hidden

Skype:      RMkrug

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