Thomas Holst <thomas.ho...@de.bosch.com> writes:
> Hello,
>
> recent org-mode versions have support for maxima via org-babel. But
> there is no support vor variables. I implemented basic support for
> variables. A header =var: eq="x^2"= is translated to:
>
> #+begin_src maxima
> eq : x^2;
> #+end_src
>
> I attached a patch to this eMail.
>
Great, thanks for sharing this patch, I'd very much like to apply this.
Have you seen the instructions for contributing to Org-mode [1]? Any
patch over 10 lines long requires signed FSF copyright attribution
papers. Please let me know if you are able to complete the copyright
assignment, once that is done I will apply this patch.
>
> Now I can use the output from one maxima block and make a LaTeX equation
> out of it with one maxima code block and reuse the output and make further
> maipulations with it. I find it dificult to explain what I want to do,
> so here is an example:
>
The example below like a nice application, you may also want to use
"begin_src latex" blocks to display equations resulting from maxima code
blocks.
Cheers -- Eric
>
> * Reuse Output of maxima code blocks
>
> #+source: eq1()
> #+begin_src maxima :exports none :results output verbatim
> display2d:false;
> eq1: x**2;
> print(eq1);
> #+end_src
> #+results: eq1
> : x^2
>
> Pretty print equation with LaTeX:
>
> #+source: eq1-latex
> #+begin_src maxima :exports results :results output latex :var eq=eq1()
> print("\\begin{equation}");
> print(tex1(eq));
> print("\\end{equation}");
> #+end_src
>
> #+results: eq1-latex
> #+BEGIN_LaTeX
> \begin{equation}
> x^2
> \end{equation}
> #+END_LaTeX
>
> Do some further calculation / maipulation to equation
>
> #+source: eq2()
> #+begin_src maxima :exports none :results output verbatim :var eq=eq1()
> display2d:false;
> eq2 : eq + sin(x);
> print(eq2);
> #+end_src
> #+results: eq5
> : sin(x)+x^2
>
> Pretty print second equation:
>
> #+source: eq2-latex
> #+begin_src maxima :exports results :results output latex :var eq=eq2()
> print("\\begin{equation}");
> print(tex1(eq));
> print("\\end{equation}");
> #+end_src
>
> #+results:
> #+BEGIN_LaTeX
> \begin{equation}
> \sin x+x^2
> \end{equation}
> #+END_LaTeX
>
> With this workflow I have all org features for docmentation of math or
> engineering works.
>
> I am a lisp beginner so my lisp code may not be the best. If there are
> better ways to accomplish variable support please let me know.
Footnotes:
[1] http://orgmode.org/worg/org-contribute.php
