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From: dieter@duenenhof-wilhelm.de (H. Dieter Wilhelm)
Subject: Re: Evaluating simple inline expressions in org-mode
Date: Sun, 07 Feb 2016 16:45:18 +0100
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>>> 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',
...

And then something like

  src_calc{2*x}

is working.

-- 
Best wishes
H. Dieter Wilhelm
Darmstadt, Germany