From: Eric S Fraga <e.fraga@ucl.ac.uk>
To: "H. Dieter Wilhelm" <dieter@duenenhof-wilhelm.de>
Cc: emacs-orgmode@gnu.org
Subject: Re: Evaluating simple inline expressions in org-mode
Date: Mon, 8 Feb 2016 09:33:03 +0000 [thread overview]
Message-ID: <878u2v35tc.fsf@delle7240.chemeng.ucl.ac.uk> (raw)
In-Reply-To: 87r3gozfqp.fsf@duenenhof-wilhelm.de
On Sunday, 7 Feb 2016 at 16:45, H. Dieter Wilhelm wrote:
>>>> works as well. I'm not sure how you define variables in calc however...
>>>
>
>>> You could write something like src_calc[:var x=3.41]{2*x} :-)
>>
>> Yes but can you save a variable for use in a later expression?
>
> Well, at the moment I don't know another way as defining the calc
> variables on the lisp level:
>
> #+BEGIN_SRC emacs-lisp
> (setq var-foo 9.81
> var-x 3.14
> var-bar ...)
> #+END_SRC
>
> Note: `var-' is a special prefix for the calc variables `foo', `x',
Thanks for this. Very useful to know. Using this, I've created a macro
which will be quite useful for me in preparing some lecture notes with
simple calculations for illustration:
#+begin_src org
,#+macro: calculate $2 \leftarrow src_calc[:exports code]{$1} = src_emacs-lisp{(setq var-$2 (string-to-number (calc-eval "evalv($1)")))}
An example:
{{{calculate(x+y,z)}}}
#+end_src
--
: Eric S Fraga (0xFFFCF67D), Emacs 25.0.90.1, Org release_8.3.3-535-g7213aa
prev parent reply other threads:[~2016-02-08 11:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 13:45 Evaluating simple inline expressions in org-mode Gary Oberbrunner
2016-02-03 13:58 ` Ken Mankoff
2016-02-03 16:09 ` Eric S Fraga
2016-02-03 16:14 ` Gary Oberbrunner
2016-02-04 7:01 ` H. Dieter Wilhelm
2016-02-04 8:38 ` Eric S Fraga
2016-02-07 15:45 ` H. Dieter Wilhelm
2016-02-08 9:33 ` Eric S Fraga [this message]
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