No results when combining :session *R* with print.xtable

[Stephan Lindner <lindners@ohsu.edu>]

Hi,

I encounter the following problem (org version 8.3.2):

When I have the following R source code block in my org file:

#+BEGIN_SRC R :exports results :results replace output latex :eval export
library(xtable)
print(xtable(matrix(c(1,2,3), nrow=1)),
            only.contents=TRUE, include.rownames=FALSE, include.colnames=FALSE, comment=FALSE, hline.after=NULL)
#+END_SRC


and I evaluate it, I get the expected result:


#+RESULTS:
#+BEGIN_LaTeX
 1.00 & 2.00 & 3.00 \\ 

#+END_LaTeX

However, when I also include the =:session *R*= in my header, I get this: 

#+BEGIN_SRC R :session *R* :exports results :results replace output latex :eval export
library(xtable)
print(xtable(matrix(c(1,2,3), nrow=1)),
            only.contents=TRUE, include.rownames=FALSE, include.colnames=FALSE, comment=FALSE, hline.after=NULL)
#+END_SRC

#+RESULTS:
#+BEGIN_LaTeX
#+END_LaTeX

I.e., no result. However, when evaluating the code in R it works (i.e., R prints out =1.00 & 2.00 & 3.00 \\=).


I need to have =:session *R*= in the header because I want to print results of previous calculations in R. I would like
to not have =\hlines= in my LaTeX output (I integrate the result into a LaTeX table).

This problem does not occur when I set =hline.after= to a non-NULL value, e.g.:

#+BEGIN_SRC R :session *R* :exports results :results replace output latex :eval export
library(xtable)
print(xtable(matrix(c(1,2,3), nrow=1)),
            only.contents=TRUE, include.rownames=FALSE, include.colnames=FALSE, comment=FALSE, hline.after=1)
#+END_SRC

#+RESULTS:
#+BEGIN_LaTeX
 1.00 & 2.00 & 3.00 \\ 
   \hline
#+END_LaTeX


Thanks!


        Stephan 
-- 
Stephan Lindner, Ph.D.
Oregon Health and Science University