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.
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:
* 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.
--
Best regards
Thomas
--- a/ob-maxima.el 2011-03-17 08:37:24.977544600 +0100
+++ b/ob-maxima.el 2011-03-23 14:13:26.780223600 +0100
@@ -47,29 +47,48 @@
"Expand a block of Maxima code according to its header arguments."
body)
+;; This function expands the body of a source code block by doing
+;; things like prepending argument definitions to the body, it should
+;; be called by the `org-babel-execute:maxima' function below.
+(defun org-babel-expand-body:maxima (body params &optional processed-params)
+ "Expand BODY according to PARAMS, return the expanded body."
+ (concat
+ (mapconcat ;; define any variables
+ (lambda (pair)
+ (format "%s : %s;"
+ (car pair) (org-babel-maxima-var-to-maxima (cdr pair))))
+ (mapcar #'cdr (org-babel-get-header params :var)) "\n") "\n" body "\n"))
+
(defun org-babel-execute:maxima (body params)
"Execute a block of Maxima entries with org-babel. This function is
called by `org-babel-execute-src-block'."
(message "executing Maxima source code block")
(let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
- (cmdline (cdr (assoc :cmdline params)))
- (in-file (org-babel-temp-file "maxima-"))
- (cmd (format "maxima --very-quiet -r 'batchload(%S)$' %s"
- in-file cmdline)))
- (with-temp-file in-file (insert body))
+ (cmdline (cdr (assoc :cmdline params)))
+ (in-file (org-babel-temp-file "maxima-"))
+ (cmd (format "maxima --very-quiet -r 'batchload(%S)$' %s"
+ in-file cmdline)))
+ (with-temp-file in-file
+ (insert (org-babel-expand-body:maxima body params)))
(message cmd)
((lambda (raw) ;; " | grep -v batch | grep -v 'replaced' | sed '/^$/d' "
(mapconcat
- #'identity
- (delq nil
- (mapcar (lambda (line)
- (unless (or (string-match "batch" line)
- (string-match "^rat: replaced .*$" line)
- (= 0 (length line)))
- line))
- (split-string raw "[\r\n]"))) "\n"))
+ #'identity
+ (delq nil
+ (mapcar (lambda (line)
+ (unless (or (string-match "batch" line)
+ (string-match "^rat: replaced .*$" line)
+ (= 0 (length line)))
+ line))
+ (split-string raw "[\r\n]"))) "\n"))
(org-babel-eval cmd ""))))
+
+(defun org-babel-maxima-var-to-maxima (var)
+ "Convert an elisp var into a string of template source code
+specifying a var of the same value."
+ (format "%s" var))
+
(defun org-babel-prep-session:maxima (session params)
(error "Maxima does not support sessions"))
