"Charles C. Berry" <ccberry@ucsd.edu> writes:

> On Wed, 30 Apr 2014, Rainer M Krug wrote:
>
>> Charles Berry <ccberry@ucsd.edu> writes:
>>
>>> Rainer M Krug <Rainer <at> krugs.de> writes:
>>>
>>>>
>>>> Hi
>>>>
>>>> Attached please find seven patches for review to implement the storing
>>>> of org variables in their own environment and to make the org-issued R
>>>> code look nicer in the R session.
>>>
>>>
>>> Rainer,
>>>
>>>
>>> I have suggestions and a concern.
>>>
>>> I suggest [...]
>
>
>> That is effectively what I am doing as well, only that I am not using a
>> package but an environment and add it to the search path.
>>
>
> [...]
>
> OK. I did not study your patches closely enough. Sorry.

No problem.

>
>
>>
>>>
>>> I also suggest that you introduce a customization variable to
>>> allow a user to turn off the functionality you have created.
>>
>> I don't think this is necessary as the behavior for the user does not
>> change at all, only that it becomes safer to use org variables in R (see
>> above).
>>
>
> All you have to do is add this:
>
> (defvar org-babel-R-assign-elisp-function 'org-babel-R-assign-elisp
>   "Name or definition of function to handle `:var name=value'
> header args."
>   )
>
> and change one line in org-babel-variable-assignments:R from
>
>     (org-babel-R-assign-elisp to
>
>    (funcall org-babel-R-assign-elisp-function
>
> and the user can provide her own elisp assignment function.
>
> This gives users who want special behavior like creating something
> other than a data.frame the option of providing their own function.

This assumes, that the user knows elisp. For many customizations this is
necessary, but I would prefer a system where the user only has to
provide an R function which will be used. This offers less
customizability, but this would make it possible to use R to do the
customization. To write a new org-babel-R-assign-elisp-function would be
quite a challenge for an R programmer (like me...).

Thanks,

Rainer



>
>
> Best,
>
>
> Chuck

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

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

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