:var problems with R

:var problems with R

[Neuwirth Erich]

The following works
#+name: xvar
#+begin_src emacs-lisp
"ahaRx"
#+end_src

#+RESULTS: xvar
: ahaR

#+name: myblock
#+begin_src R :var xxx=xvar
xxx
#+end_src

#+RESULTS: myblock
: ahaRx

But when I replace emacs-lisp with R in the first code block, it does not work any more.
I think it should because R also returns the character value in that case.

Any ideas?

Re: :var problems with R

[suvayu ali]

Hi Neuwirth,

On Thu, Jun 21, 2012 at 8:14 AM, Neuwirth Erich
<erich.neuwirth@univie.ac.at> wrote:
> The following works
> #+name: xvar
> #+begin_src emacs-lisp
> "ahaRx"
> #+end_src

Why are you not using something that you know works? Try the following
for example.

#+name: xvar
|"ahaRx"|

#+name: myblock
#+begin_src R :var xxx=xvar
xxx
#+end_src

#+RESULTS: myblock
: ahaRx

As I understand it, Babel can read from tables and lists only.
Actually, to me, reading from a block of text doesn't make much sense
for a source block. What kind of data structure would it represent
(other than a long string of course :-p)?

GL

-- 
Suvayu

Open source is the future. It sets us free.

Re: :var problems with R

[Thomas S. Dye]

Neuwirth Erich <erich.neuwirth@univie.ac.at> writes:

> The following works
> #+name: xvar
> #+begin_src emacs-lisp
> "ahaRx"
> #+end_src
>
> #+RESULTS: xvar
> : ahaR
> #+name: myblock
> #+begin_src R :var xxx=xvar
> xxx
> #+end_src
>
> #+RESULTS: myblock
> : ahaRx
>
> But when I replace emacs-lisp with R in the first code block, it does
> not work any more.
> I think it should because R also returns the character value in that case.
>
> Any ideas?
>

This works here:

#+name: xvar
#+begin_src R
"ahaRx"
#+end_src

#+RESULTS: xvar
: ahaRx


#+name: myblock
#+begin_src R :var xxx=xvar
xxx
#+end_src

#+RESULTS: myblock
: ahaRx

You don't say what doesn't work, which makes it difficult to diagnose
what might be going wrong on your end.

All the best,
Tom

-- 
Thomas S. Dye
http://www.tsdye.com

Re: :var problems with R

[Neuwirth Erich]

Meanwhile I learned that

#+name: xvar
: waterfall

#+name: myblock
#+begin_src R :var xxx=xvar
print(xxx)
#+end_src

#+RESULTS: myblock
: waterfall


ans so will

#+name: xvar2
: water

#+name: myblock2
#+begin_src R :var xxx=xvar2
xxx
#+end_src

#+RESULTS: myblock2
: water

The critical missing piece for me was the colon in front of the value in a name definition.

I wanted this because I am running a project on different machines, and I want to give the
name od subdirectories through this mechanism.
Ir seems cleaner than using code in a programming language when we just need constants.


And I explained the problem seems to be that a value returned by R in a named block is not accessible
as a named "variable".
In this case, I would rather stay with R which I need anyhow and I have to explain to my coworkers.
Using emacs-lisp additionally would just make things harder to understand fore some of the project members.



This also works now

#+name: rvar
#+begin_src R
"raha"
#+end_src

#+RESULTS: rvar
: raha

#+name: rvartest
#+begin_src R :var xxx=rvar
xxx
#+end_src


I had misunderstood something there.