Re: R code not producing expected results

[David Hajage <dhajage@gmail.com>]

I think you need to add 'results output org' to the header.
Do not try to convert ascii objects into data.frame, ascii() just
print several classes or R objects with org markup. Not all R objects
are supported, see methods(ascii).

Some examples here:

http://orgmode.org/worg/org-contrib/babel/examples/ascii.php

The source code here:
http://repo.or.cz/w/Worg.git/blob_plain/HEAD:/org-contrib/babel/examples/ascii.org

Best
David

Le 13 août 2010 à 08:57, "Charles C. Berry" <cberry@tajo.ucsd.edu> a écrit :

> On Thu, 12 Aug 2010, Blanchette, Marco wrote:
>
>> Dear all,
>>
>
>> Sorry if this is something totally obvious but I am learning to use
>  org-mode for my everyday work with R. I just installed the latest
>  stable release of org-mode (v7.01g) on top of GNU Emacs 23.1.50.1
>  (x86_64-apple-darwin10.2.0, NS apple-appkit-1038.25). I also
>  installed the CRAN ascii package v0.7 on top of R v2.11.1. I am
>  currently working on a MacBook pro with Snow Leopard 10.6.4
>
>>
>
>> Early on today, while reading the org-babel intro, I was able to run
>  the following example but somehow, later tonight, it started to
>  break and I spent the last few hours scratching my head to
>  understand what change and why it now suddenly break. Your help will
>  be greatly appreciated as I am discovering that org-mode in
>  collaboration with org-babel have great potential to help us create
>  more readable report of our daily analysis, as long as I can get
>  through these early hurdles.
>
> The code you say is "straight from ...org-babel-doc-R.php" is not quite.
>
> Note all the header args:
>
>    #+begin_src R :results output code :session ascii
>
> Also note that ascii() does not return an object of class "matrix" or "data.frame". Try str(ascii( < all the rest > )).
>
> With :results value (the default) you will get a different outcome as
> you saw below.
>
> 'value' tries to be smart about what it does with .Last.value, but "ascii" objects are a bit too tricky for it.
>
> 'output' on the other hand is pretty simple on the elisp side and relies on R's print() to get the dispatch for the print method right.
>
> If you want to use ':results value' you will need to form a data.frame from ascii() yourself, rather than rely on as.data.frame to find a method to do the conversion. Or you will need to write a method for as.data.frame.ascii.
>
> HTH,
>
> Chuck
>
>
>>
>> Here is the org buffer that now breaks:
>>
>> * Two examples of R code that worked when I started the tutorial but suddenly started to fail...
>>
>> ** some R code that should generate a nice table
>> #+BEGIN_SRC R
>> library(ascii)
>> options(asciiType="org")
>>
>> d <- as.data.frame(replicate(4,rnorm(100)))
>>
>> ascii(cor(d),include.rownames=T, include.colnames=T,header=T)
>> #+END_SRC
>>
>> ** Some code straight from [[http://orgmode.org/worg/org-contrib/babel/languages/org-babel-doc-R.php][org-babel]]
>> #+BEGIN_SRC R
>> library(ascii)
>> options(asciiType="org")
>> ascii(summary(table(1:4, 1:4)))
>> #+END_SRC
>>
>>
>> With the following error recover from the *Org-Babel Error* buffer
>>
>> Loading required package: proto
>> Error in as.data.frame.default(x[[i]], optional = TRUE) :
>> cannot coerce class 'c("ascii", "proto", "environment")' into a data.frame
>> Calls: write.table ... data.frame -> as.data.frame -> as.data.frame.default
>> Execution halted
>>
>> Thanks for the helps.
>> --
>> Marco Blanchette, Ph.D.
>> Assistant Investigator
>> Stowers Institute for Medical Research
>> 1000 East 50th St.
>>
>> Kansas City, MO 64110
>>
>> Tel: 816-926-4071
>> Cell: 816-726-8419
>> Fax: 816-926-2018
>>
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>
> Charles C. Berry                            (858) 534-2098
>                                            Dept of Family/Preventive Medicine
> E mailto:cberry@tajo.ucsd.edu                UC San Diego
> http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901
>
>
>
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