From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thierry =?utf-8?b?UGVsbMOp?= <thierry.pelle@soliavos.fr>
Subject: Re: Computations on properties
Date: Thu, 10 Oct 2013 06:39:22 +0000 (UTC)
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After some tests :
==> the idea of Michael
> --------------------------------
> * Mean Calculation
>   :PROPERTIES:
>   :VAL1:     5
>   :VAL2:     10
>   :COEF:     10
>   :END:
> 
>   Mean Calculation = call_mean() =5.454545454545454=
> 
> * code :noexport:
>   #+NAME: mean
>   #+HEADER: :var val1='nil
>   #+HEADER: :var val2='nil
>   #+HEADER: :var coef='nil
>   #+BEGIN_SRC emacs-lisp :exports none
>     (setq
>      val1 (string-to-number (org-entry-get
>                              org-babel-current-src-block-location "VAL1" t))
>      val2 (string-to-number (org-entry-get
>                              org-babel-current-src-block-location "VAL2" t))
>      coef (string-to-number (org-entry-get
>                              org-babel-current-src-block-location "COEF" t)))
>     (/ (+ (* val1 coef) val2) (+ coef 1.0))
>   #+END_SRC
> --------------------------------
 
give an error ( "Symbol's value as variable is void:
org-babel-current-src-block-location")

==> After some tests, it works in changing the "setq" part as
 val1 (or val1 (string-to-number
            (org-entry-get org-babel-current-src-block-location "VAL1" t)
                ))

I can't figure out why...

==> I will try with python...

Thanks