[Orgmode] Re: Mathematical Pseudocode in Source Block

[Dan Davison]

Jeremiah Via <address@hidden> writes:

> Hi there,
>
> I was wondering if there was any way to make the source blocks work
> with LaTeX formulas. I wanted to use it for some pesudocode; for
> example:
>
> while not converged
>   for each state i
>        \( U^{'}_i = r_i + \underset{a}{argmax} \sum{Pa_{ij}U_j} \)
>        \( U_i \rightarrow U^{'}_i \)
>   end for
> end while
>
> If a source block isn't possible, is there at least a way to get a
> textbox around it?

Hi Jeremiah,

Absolutely. Here are some quick notes

- Org can recognise simple LaTeX constructs inline, without any special
  markup

  section 11.7 of the manual
  http://orgmode.org/org.html#Embedded-LaTeX

- The basic way to place more complex fragments of latex in an Org
  document is in a #+begin_latex block

  section 12.6 of the manual
  http://orgmode.org/org.html#LaTeX-and-PDF-export

- Personally I use the listings package to format pseudocode, e.g.

#+begin_latex
\begin{algorithm}
  \caption{An algorithm}
  \label{alg:myalg}
  \begin{lstlisting}[mathescape,escapeinside='']
    '\foreach individual $i$'
        '\foreach group $k$'
            $\gamma_{ik} \getsp Q_{k}\prod_{l}\prod_{a=1}^{2}P_{lkX_{ila}}$
  \end{lstlisting}
\end{algorithm}
#+end_latex

- Don't forget the nice Org functionality like C-c ' to view the latex
  code in a latex-mode buffer (manual section 11.3), and C-c C-x C-l to view a 
png image of
  the latex fragment (manual section 11.7.4).

- The latex can also be included in HTML export. By default this uses
  png images, but check out this thread for using MathJax and jsMath to
  have javascript-mediated rendering of LaTeX formulas in HTML with
  genuine fonts

http://thread.gmane.org/gmane.emacs.orgmode/28259

- You can use a #+latex_header line to specify additional latex
  preamble lines. E.g. I defined the \foreach command in a file
  emvbpl.sty and make sure that file is included with

#+latex_header: \usepackage{emvbpl}

- In addition, latex can be included inside begin_src latex blocks, to
  achieve a variety of extra functionality, and also some of the same
  functionality as above.

  chapter 14
  http://orgmode.org/org.html#Working-With-Source-Code


Don't hesitate to come back to this list with further questions.

Dan



>
> Thank you