From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Leha <andreas.leha@med.uni-goettingen.de>
Subject: Re: Tangle including code generating graphics for :results graphics
Date: Thu, 24 Sep 2015 09:41:56 +0100
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References: <m2twqkfcj3.fsf@krugs.de>
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Hi Rainer,

Rainer M Krug <Rainer@krugs.de> writes:
> Hi
>
> Is it possible to tangle an R code block including the code which is
> generating the graphs when using =:results graphics= ?
>
> I would like to tangle these code blocks generating the graphs as I
> would like to have a script which I can use to easily update all graphs
> when the simulated input data is updated. I have this for the actual
> analysis which works perfectly, but would like to have the same for the
> graphs. At the same time, I like the clarity of specifying :width and
> :height and other parameter for the plotting as header arguments.
>
> I have
>
> ,----
> | :PROPERTIES:
> | :header-args+: :prologue "env <- fitBFGS; attach(env)"
> | :header-args+: :epilogue "detach(env); rm(env)"
> | :END:
> `----
>
> and this is tangled perfectly - but obviously not the code for
> plotting. Is there an argument / setting to enable this?
>
> Thanks,
>
> Rainer

That is a very relevant question and I'd be interested in the answer as
well.  But I am not aware of any support by Org mode for this.

I guess calling `org-babel-expand-src-block' prior to tangling would
answer your needs?

This would be desirable not only for plotting code blocks, also data
passed to code block is 'lost' during tangling.

I think it would be good to have a source block header argument, say
`:tangleexpanded', controlling such functionality.

WDYT?

Regards,
Andreas