Emacs org does not evaluate source blocks at export anymore (version 8.3.2)

Question

I have org-mode on two computers. On one, the version is 8.2.5h; one the other, 8.3.2.

Evaluation of source blocks works on the machine with the 8.2.5h version but not on the 8.3.2 version.

Here is a minimal example:

* Emacs org / R / latex. 

  Make a random number. 

  #+BEGIN_SRC R :session *R*
    x <- rbeta(1000,10,10)
  #+END_SRC



  Plot the whole thing. 

  #+BEGIN_SRC R :session *R* :exports none
    pdf(file="fig1.pdf", width=8, height=6)
    hist(x, main="")
    dev.off()
  #+END_SRC


  Now put it in this text file. 

  #+BEGIN_SRC latex
    \begin{figure}[h!]
      \centering
      \includegraphics[width=.9\textwidth]{fig1.pdf}    
      \caption{Gamma distribution}
      \label{fig:hist-gamma}
    \end{figure}
  #+END_SRC


  Now a latex equation:

  #+BEGIN_SRC latex
    \begin{equation}
      \label{eq:eq1}
      y_{it} = \beta_0 + \beta_1 X_{it} + \varepsilon_{it}
    \end{equation}
  #+END_SRC

When I export this to latex with org mode version 8.2.5h, I get a pdf with the figure, the latex equation etc. When I export the same file to latex with org mode version 8.3.2, the source blocks are not evaluated; only the code for the first source block is shown.

I played with changing switches, none of these works. Is this a bug?

user3321294 user3321294 · Accepted Answer · 2016-02-27T21:59:50

The problem was the variable org-export-babel-evaluate. For some reason that was set to nil. Apparently not an org-version problem but the description states "This variable was introduced, or its default value was changed, in version 24.1 of Emacs", so maybe that was the issue.

Emacs org does not evaluate source blocks at export anymore (version 8.3.2)

1 Answers