Re: [O] [PATCH] -for review- Tangling with variable transfer of variables

[Rainer M Krug]

"Charles C. Berry" <address@hidden> writes:

> On Fri, 20 Jun 2014, Rainer M Krug wrote:
>
>> Attached please find =the reworked patch.
>>
>> 1) uses local() and closes connection
>> 2) does not leave a variable cal;led file behind
>>
>
> Seems to work on a few test cases.
>
> I'd move the strings to defconsts.
>
> Putting a newline before each `%S' will outdent the first line of 
> :var value when it is echoed in the session log so it will be easier to 
> view.

Done

>
> ===
>
> With Eric's input on this:
>
> Would you also change this at the end of org-babel-R-assign-elisp:
>
>                          res})" name file header row-names max))))
> -    (format "%s <- %s" name (org-babel-R-quote-tsv-field value))))
> +    (format "%s <- %S" name
> +         (if (stringp value) value (prin1-to-string value)))))
>

Good idea - done. but as far as I understand the help for the function
format %S

,----
| %S means print any object as an s-expression (using `prin1').
`----

the second line is redy=undant, as the function format is doing it
anyway?

I'll leave the second line out and replace it with =value= instead, but
please correct meif I am missing something here.

Thanks,

Rainer

> ??
>
> I think this is innocuous for plain strings with no internal quotes, but 
> allows almost anything to be passed to R as a string.
>
> So
>       :var x=[1 2 3 "4" 5]
>
> will be passed to R as x <- "[1 2 3 \"4\" 5]"
>
> instead of x <- "[1 2 3 "4" 5] which throws an error.
>
> And this just works:
>
> #+NAME: latex-capt
> #+BEGIN_SRC latex
>    \begin{math}
>      y = X\beta,
>      \mbox{where } \beta = %beta%
>    \end{math}
> #+END_SRC
>
> #+BEGIN_SRC R :var ytxt=latex-capt :results raw :wrap latex
> beta <- 1.234
> sub("%beta%",beta,ytxt)
> #+END_SRC
>
>
> HTH,
>
> 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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