From: Michael Brand <michael.ch.brand@gmail.com>
To: Stefan Huchler <stefan.huchler@mail.de>
Cc: Org Mode <emacs-orgmode@gnu.org>
Subject: Re: how to group together fields
Date: Sat, 22 Feb 2014 21:20:29 +0100 [thread overview]
Message-ID: <CALn3zojuvqgnzkW2e2B6WPpF+ipSN3gLbcAN9xZrdR=P_VoYoA@mail.gmail.com> (raw)
In-Reply-To: <8738k09q13.fsf@mars.lan>
Hi Stefan
On Mon, Feb 3, 2014 at 4:25 PM, Stefan Huchler <stefan.huchler@mail.de> wrote:
> I get with the 1. COLUMNS line something like that:
>
> Tea Shop 1 | 5.0 | ...
> Tea Shop 2 | 7.0 | ...
>
> I want another output that looks like that:
>
> Blend 1 | 6.0 | ...
> Blend 2 | 3.0 | ...
My suggestion for these several GROUP BY as in SQL on the same data is
to use Org babel with R or TBLFM.
I am not a user of the R programming language and therefore can not
provide a working example but it would be one of the simpler
solutions. Put all data into one Org table just like "#+NAME: data"
below and for each result table use an Org babel source block with R
that reads from this table.
Some R example of GROUP BY as in SQL:
http://stats.stackexchange.com/questions/8225/how-to-summarize-data-by-group-in-r
With TBLFM the only thing that comes to my mind is org-lookup-all. The
disadvantage of this solution is that you have to enumerate all groups
manually in the result tables:
#+NAME: data
| Purchase | Product | Shop | Rating |
|----------+---------+------+--------|
| a | p1 | s1 | 1 |
| b | p1 | s2 | 4 |
| c | p2 | s1 | 2 |
| d | p3 | s2 | 8 |
Product rating and ranking by average purchase:
| Product | Rating | Ranking |
|---------+--------+---------|
| p1 | 2.5 | 2 |
| p2 | 2.0 | 3 |
| p3 | 8.0 | 1 |
#+TBLFM: $2 = '(let ((all (org-lookup-all '$1 '(remote(data,
@I$2..@>$2)) '(remote(data, @I$4..@>$4))))) (/ (apply '+ all) (length
all) 1.0)); L :: $3 = '(+ 1 (length (org-lookup-all $2 '(@I$2..@>$2)
nil '<))); N
Shop rating and ranking by average purchase:
| Shop | Rating | Ranking |
|------+--------+---------|
| s1 | 1.5 | 2 |
| s2 | 6.0 | 1 |
#+TBLFM: $2 = '(let ((all (org-lookup-all '$1 '(remote(data,
@I$3..@>$3)) '(remote(data, @I$4..@>$4))))) (/ (apply '+ all) (length
all) 1.0)); L :: $3 = '(+ 1 (length (org-lookup-all $2 '(@I$2..@>$2)
nil '<))); N
I added the above TBLFM solution as an ERT that can also be found via
Worg: On the page with the Worg tutorials in the spreadsheet section
follow the link to the "Emacs Regression Test (ERT) for Org tables"
with example use cases for TBLFM:
http://orgmode.org/worg/org-tutorials/index.html#Spreadsheet
In the ERT it is test-org-table/org-lookup-all.
Michael
next prev parent reply other threads:[~2014-02-22 20:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-30 15:45 how to group together fields Stefan Huchler
2014-01-31 11:44 ` Alexander Baier
[not found] ` <87r47nshuh.fsf@mars.lan>
2014-02-01 11:03 ` Alexander Baier
[not found] ` <87mwibrs5u.fsf@mars.lan>
2014-02-01 11:46 ` Alexander Baier
[not found] ` <87ioszrr6l.fsf@mars.lan>
2014-02-01 12:33 ` Alexander Baier
2014-02-01 13:02 ` Stefan Huchler
2014-02-03 8:51 ` Bastien
2014-02-03 15:25 ` Stefan Huchler
2014-02-22 20:20 ` Michael Brand [this message]
2014-02-23 1:12 ` Stefan Huchler
2014-02-23 7:32 ` Michael Brand
2014-02-22 15:19 ` Stefan Huchler
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