From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: emacs-orgmode@gnu.org
Subject: Re: Computations on properties
Date: Wed, 09 Oct 2013 20:21:04 +0200 [thread overview]
Message-ID: <877gdms3u7.fsf@ericabrahamsen.net> (raw)
In-Reply-To: 87bo2ymkq6.fsf@gmail.com
Thorsten Jolitz <tjolitz@gmail.com> writes:
> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>
>> Thierry Pellé <thierry.pelle@soliavos.fr> writes:
>>
>>> Hi,
>>> I'm seeking how to do something like that
>>>
>>> Let the following text inserted in an org-mode file
>>>
>>> * Mean Calculation
>>> :PROPERTIES:
>>> :VAL1: 5
>>> :VAL2: 10
>>> :COEF: 10
>>> :END:
>>>
>>> I would like to append the result of a computation
>>> like RES=(VAL1*COEF+VAL2)/(COEF+1)
>>>
>>> Something like
>>> * Mean Calculation
>>> ...
>>> :END:
>>>
>>> Mean Calculation=RES (where RES is the value of the result)
>>>
>>> I think to do this with a python script but is there a more org-mode/emacs
>>> method to do it?
>>
>> Sometimes I think it would be nice to have a way to draw property values
>> directly into a babel block, the way you can with table data. Sort of
>> like:
>>
>> * Heading
>> :PROPERTIES:
>> :ID: 3f78f08a-ccca-4fc0-aba9-2a192f7a0e5a
>> :foo: 5
>> :bar: puppy
>> :END:
>>
>> #+BEGIN_SRC emacs-lisp :var alist=3f78f08a-ccca-4fc0-aba9-2a192f7a0e5a
>>
>> And in the block, the "alist" variable would look like '(:foo 5 :bar
>> "puppy").
>>
>> What would be even better would be to run a tags search on matching
>> headlines and feed all property drawers into a single block, as a list
>> of alists. Just thinking out loud...
>
> This is probably not really what you want, but at least somehow related. I
> would not know how to do this via source-block arguments, but maybe you can
> use the results of one source-block (that produces the data) as input for
> another source-block that does the real work.
Sure, it's certainly doable, and in more than one way, but I think
that's part of the problem: the reason the table-to-src-block-var
process is so great is that it feels purpose-built to do what it does.
For properties you've got search, column view, and the API, but it never
quite feels like the potential is unlocked...
> * Heading 1 :match:
> :PROPERTIES:
> :ID: 3f78f08a-ccca-4fc0-aba9-2a192f7a0e5a
> :foo: 5
> :bar: puppy
> :END:
>
> * Heading 2
> :PROPERTIES:
> :ID: 3f78f08a-ccca-4fc0-aba9-2a192f7a0e5b
> :foo: 6
> :bar: yuppy
> :END:
>
>
> * Heading 3 :match:
> :PROPERTIES:
> :ID: 3f78f08a-ccca-4fc0-aba9-2a192f7a0e5c
> :foo: 7
> :bar: hippie
> :END:
>
>
> #+begin_src emacs-lisp :results raw
> (let ((lst))
> (org-map-entries
> (lambda () (cons (org-entry-properties) lst))
> "match" 'file))
> #+end_src
>
> #+results:
> ((((FILE . /home/tj/News/drafts/drafts/419) (TAGS . :match:) (ALLTAGS
> . :match:) (BLOCKED . ) (ID . 3f78f08a-ccca-4fc0-aba9-2a192f7a0e5a) (foo . 5)
> (bar . puppy) (CATEGORY . 419))) (((FILE . /home/tj/News/drafts/drafts/419)
> (TAGS . :match:) (ALLTAGS . :match:) (BLOCKED . ) (ID .
> 3f78f08a-ccca-4fc0-aba9-2a192f7a0e5c) (foo . 7) (bar . hippie) (CATEGORY .
> 419))))
next prev parent reply other threads:[~2013-10-09 18:20 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-09 12:19 Computations on properties Thierry Pellé
2013-10-09 12:50 ` Thorsten Jolitz
2013-10-09 13:32 ` Thierry Pellé
2013-10-09 15:29 ` Eric Abrahamsen
2013-10-09 17:12 ` Thorsten Jolitz
2013-10-09 18:21 ` Eric Abrahamsen [this message]
2013-10-09 18:23 ` Eric Schulte
2013-10-10 4:52 ` Eric Abrahamsen
2013-10-09 19:27 ` Michael Brand
2013-10-10 6:39 ` Thierry Pellé
2013-10-10 9:04 ` Michael Brand
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