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[O] Unit conversions and symbolic mathematics with Babel
From: |
H. Dieter Wilhelm |
Subject: |
[O] Unit conversions and symbolic mathematics with Babel |
Date: |
Wed, 03 Sep 2014 08:54:19 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux) |
Hello Org,
for some engineering most often I need estimations with unit
conversions, Emacs Calc is perfect for this.
When it comes to reporting and documentation I'd like to do it with
org-mode, of course. For numerical stuff and visualisation purposes I'm
using already R and TikZ. But for unit conversions and symbolic maths
I'm in a bind when trying to do this with free programs.
- R :: Do you have experience with a units packages under the R-project?
What I've seen so far is not so reassuring...
- Maxima :: I think there is a nice and intuitive units package for
maxima. But this would mean learning an additional tool and mentally
switching between both within one document.
- Calc :: I'd prefer to do it with Calc but the Babel interface is
(yet?) restricted
For example, I can define functions and do some unit conversions:
#+BEGIN_SRC emacs-lisp
(defmath cvun(a b)
(math-convert-units a b))
#+END_SRC
#+RESULTS:
: calcFunc-cvun
#+BEGIN_SRC calc :var L1 = "5 mm"
cvun( L1, m)
#+END_SRC
#+RESULTS:
: 5e-3 m
But what is missing is to assign variables within a source block
#+BEGIN_SRC calc :var L1 = "5 mm"
L2 := cvun( L1, m)
#+END_SRC
Unfortunately this is not working. Do you have an idea how to
implement this?
- Are you using (better) alternatives?
Thanks for your insights
Dieter
--
Best wishes
H. Dieter Wilhelm
Darmstadt, Germany
- [O] Unit conversions and symbolic mathematics with Babel,
H. Dieter Wilhelm <=