Hey Eric,

Thanks for you tip, but I guess the dvipng command works well. Things get kind of strange, since if I type $2^6$, Org recognizes it, and generates the right results, which means, it could find all the latex package needed. But if I try

--------
#+BEGIN_LaTeX
    \begin{equation}                          % arbitrary environments,
    x=\sqrt{b}                                % even tables, figures
    \end{equation}                            % etc
#+END_LaTeX
--------

It will end up with some strange picture in ltxpng directory, which is just all black, nothing...

Do you have any idea?

Thanks a lot!

Chao

On Mon, Feb 1, 2010 at 2:56 PM, Eric Schulte <schulte.eric@gmail.com> wrote:
Hey Chao,

Chao Lu <chaol@princeton.edu> writes:

> Hey Eric,
>
> Now it works! Thank you soooo much. I'll read through the reference, sorry to bother you
> so much, a little busy on research.
>

I'm happy to help.

>
> And, Could I ask for more... Say, are you using Org to generate LaTeX or beamer, by any
> chance? If so, I'm trying to configure the LaTeX part, my Org has been able to find the
> dvipng and latex bins, for it recognized the LaTeX blocks, and produced the images in
> the ltxpng dir. But problems the images it generated is just black, with nothing... Do
> you have any idea?
>

Hmm, I do use org for both latex and Beamer presentations, it sounds
like what you're describing is an issue during the preview of latex
fragments from within org-mode files?

I've had problems with that in the past, but they've mainly ended up
being issue with org finding and using my dvipng command.  I'd take a
look at your messages buffer, and if you continue to have problems you
can submit a bug report to the org-mode mailing list.

Good Luck -- Eric

>
> Best,
>
> Chao
>
> On Mon, Feb 1, 2010 at 2:00 PM, Eric Schulte <schulte.eric@gmail.com> wrote:
>
>     Hi Chao,
>
>     Try the following alternative to your statement
>
>     ----------
>     #+begin_src emacs-lisp :exports results
>      (defun fibonacci (n)
>        (if (or (= n 0) (= n 1))
>            n
>          (+ (fibonacci (- n 1)) (fibonacci (- n 2)))))
>
>      (mapcar (lambda (row)
>                (mapcar #'fibonacci row)) fib-inputs)
>     #+end_src
>     ----------
>
>     for more information on Org-babel see [1], and specifically for more
>     information on the use of header arguments like :exports see [2].
>
>     Best -- Eric
>
>     Chao Lu <chaol@princeton.edu> writes:
>
>     > Hey Eric,
>     >
>     > Thanks again for your instruction, now it works well. But could I ask more about
>     > org-babel?
>     >
>     > Actually I tried to enabled it by:
>     > -----------
>     > (require 'org-babel-init)
>     > (require 'org-babel-ditaa)
>     > (org-babel-load-library-of-babel)
>     > -----------
>     >
>     > Then tried to evaluate it by
>     > ----------
>     > #+begin_src emacs-lisp
>     >   (defun fibonacci (n)
>     >     (if (or (= n 0) (= n 1))
>     >         n
>     >       (+ (fibonacci (- n 1)) (fibonacci (- n 2)))))
>     >  
>     >   (mapcar (lambda (row)
>     >             (mapcar #'fibonacci row)) fib-inputs)
>     > #+end_src
>     > ----------
>     >
>     > But seems did not get what I want, which should be a series of numbers, what I got
>     from
>     > is just a colored output when I export this file to html.
>     >
>     > Would you mind explain a little bit?
>     >
>     > Many thanks,
>     >
>     > Chao
>     >
>     > On Mon, Feb 1, 2010 at 10:40 AM, Eric Schulte <schulte.eric@gmail.com> wrote:
>     >
>     >     Chao Lu <loochao@gmail.com> writes:
>     >
>     >     > Hey Eric,
>     >     >
>     >     > Thanks for the tip, it works well here!
>     >     >
>     >     > Yet another further question, is it possible to assign the directory where
>     the
>     >     picture
>     >     > should be exported to? For it is kind of messy if all the figures goes to
>     the root
>     >     > directory.
>     >     >
>     >
>     >     Yes, just add it to the :file name, i.e.
>     >
>     >     #+begin_src ditaa :file data/communication.png :exports results
>     >
>     >     Best -- Eric
>     >
>     >     >
>     >     > Thanks a lot for your help,
>     >     >
>     >     > Chao
>     >     >
>     >     > On Sat, Jan 30, 2010 at 7:46 PM, Eric Schulte <schulte.eric@gmail.com>
>     wrote:
>     >     >
>     >     >     Hi Chao,
>     >     >
>     >     >     I don't believe that it is currently possible to customize the file
>     >     >     names in the ways you have described using the standard begin_ditaa
>     >     >     blocks.  It is possible to have complete control over the file names
>     >     >     using org-babel, in which case the corresponding block would look like
>     >     >
>     >     >     --------
>     >     >     #+begin_src ditaa :file communication.png :exports results
>     >     >
>     >     >      blabla
>     >     >
>     >     >     #+end_src
>     >     >     --------
>     >     >
>     >     >     then the image will be created on export, and you can also preview the
>     >     >     image by pressing C-c C-o on the block.
>     >     >
>     >     >     To activate org-babel add the following to your Emacs configuration
>     >     >
>     >     >     (require 'org-babel-init)
>     >     >     (require 'org-babel-ditaa)
>     >     >
>     >     >     Best -- Eric
>     >     >
>     >     >     Chao Lu <loochao@gmail.com> writes:
>     >     >
>     >     >     > Dear all,
>     >     >     >
>     >     >     > When I'm using the ditaa in a org file called pearl.org, by
>     >     >     >
>     >     >     > --------
>     >     >     > #+begin_ditaa communication.png
>     >     >     >
>     >     >     > blabla
>     >     >     >
>     >     >     > #+end_ditaa
>     >     >     > --------
>     >     >     >
>     >     >     > It generates a file called
>     >     >     communication_5e2f49c31c46339e8e3af9ef8a2fd2dfa3d1fe74.png,
>     >     >     > but this picture is right located at the same file as the org file(
>     pearl.org
>     >     ). Is
>     >     >     it
>     >     >     > possible to let it go to certain dir like the latex pictures do? And
>     is it
>     >     >     possible to
>     >     >     > let the generated picture has the prefix of the org file name
>     automatically,
>     >     like
>     >     >     > org_communication_5e2f49c31c46339e8e3af9ef8a2fd2dfa3d1fe74.png?
>     >     >     >
>     >     >     > Thanks,
>     >     >     >
>     >     >     > Chao
>     >     >     >
>     >     >     > _______________________________________________
>     >     >     > Emacs-orgmode mailing list
>     >     >     > Please use `Reply All' to send replies to the list.
>     >     >     > Emacs-orgmode@gnu.org
>     >     >     > http://lists.gnu.org/mailman/listinfo/emacs-orgmode
>
>     Footnotes:
>     [1]  http://orgmode.org/worg/org-contrib/babel/
>
>     [2]  http://orgmode.org/worg/org-contrib/babel/reference.php