From: Rasmus <rasmus@gmx.us>
To: emacs-orgmode@gnu.org
Subject: Re: How to do a sum of products in a table?
Date: Fri, 14 Jun 2013 19:34:16 +0200 [thread overview]
Message-ID: <87y5ac61gn.fsf@pank.home> (raw)
In-Reply-To: m2bo78mycf.fsf@polytechnique.org
Alan Schmitt <alan.schmitt@polytechnique.org> writes:
> | Name | Grade | Question 1 | Question 2 | Question 3 |
> | Coeff | 6 | 1 | 3 | 2 |
> |-------+-------+------------+------------+------------|
> | Foo | | 1/2 | 1 | 1/4 |
> | Bar | | 1 | 1 | 0 |
> #+TBLFM: @2$2=vsum($3..$>)
>
> I would like the grade of Foo to be 10 * (1/2 * 1 + 1 * 3 + 1/4 * 2)/6
> and Bar to be 10 * (1 * 1 + 1 * 3 + 0 * 2)/6
both are ≈ 6.67.
> Thanks, but I does not seem to do what I want. I prefer to keep the
> coefficient in the column with the question name so that I can easily
> know what it refers to when I adjust it.
So perhaps you'd want something like this
| | Name | Grade | Question 1 | Question 2 | Question 3 |
| ! | | grade | q1 | | q3 |
| _ | | g | | | |
| / | Coeff | 6 | 1 | 3 | 2 |
|---+-----------+-----------+------------+------------+------------|
| * | Foo | 6.67 | 1/2 | 1 | 1/4 |
| * | Bar | 6.67 | 1 | 1 | 0 |
| * | Baz | 7.5 | 1 | 3/2 | -1/2 |
|---+-----------+-----------+------------+------------+------------|
| _ | | mean | | max | |
| | Mean | 6.9444445 | std.dev. | 0.48112521 | |
| $ | Constants | magic=10 | | | |
|---+-----------+-----------+------------+------------+------------|
#+TBLFM: $g=vsum($q1..$q3):: $3=round(@I-1$q1..@I-1$q3*$q1..$q3*$magic/$g,2)::
#+TBLFM: $mean=vmean(@I$grade..II$grade)::$max=vsdev(@I$grade..II$grade)
It even exports pretty tables so you could hardly wish for more.
–Rasmus
--
When in doubt, do it!
next prev parent reply other threads:[~2013-06-14 17:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-14 14:09 How to do a sum of products in a table? Alan Schmitt
2013-06-14 15:13 ` Rasmus
2013-06-14 16:49 ` Alan Schmitt
2013-06-14 17:34 ` Rasmus [this message]
2013-06-14 18:53 ` Alan Schmitt
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