Re: [O] Babel-R TBLFM example

[Shiyuan]

Yes, it works. Thanks, Sebastien. 

Shiyuan 

On Mon, Aug 25, 2014 at 12:51 AM, Sebastien Vauban <address@hidden> wrote:

Shiyuan wrote:
> I am looking at a simpler example, the pie-chart example as in this link:
> http://orgmode.org/worg/org-contrib/babel/intro.html#literate-programming
>
> This example(src code attached in the end) first generates a table by a
> shell command and then run a R one-liner which uses the table.  However,
> when the R code is evaluated, I got an error about the object dirs not
> found.  This is what I got in the buffer running R:
> -------------------------------
> options(STERM='iESS', str.dendrogram.last="'", editor='emacsclient',
> show.error.locations=TRUE)
>>
> Error in pie(dirs[, 1], labels = dirs[, 2]) (from
> address@hidden) : object 'dirs' not found
> -----------------------------------------------
>
> It looks like that the conversion is wrong.  When I run
> `org-babel-expand-src-block`
> on the R source code, I don't see the R object dirs is expanded to
> anything. I don't understand how the conversion works, and how Babel passes
> the table to R. Any explanation is appreciated. Which function/file should
> I look at? Are there working examples for passing a table to R? Thanks.
>

> #+name: directories
> #+begin_src shell :results replace
>   cd ~ && du -sc * |grep -v total
> #+end_src
>
> #+RESULTS: directories
> |       8 | #*message*-20140319-231047# |
> | 1168376 | Documents                   |
> | 9952288 | Downloads                   |
> |       8 | xmodmap2~                   |
>
> #+name: directory-pie-chart(dirs = directories)
> #+begin_src R :session R-pie-example :file ~/tmp/dirs.png
>   pie(dirs[,1], labels = dirs[,2])
> #+end_src

AFAICT, the arguments to code blocks may not be defined and set in the
`name' line anymore: this must be done on the `begin_src' line.

So, the following should work:

  #+name: directory-pie-chart
  #+begin_src R :var dirs=directories :session R-pie-example :file ~/tmp/dirs.png

    pie(dirs[,1], labels = dirs[,2])
  #+end_src

Best regards,
  Seb

--
Sebastien Vauban