From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Brand <michael.ch.brand@gmail.com>
Subject: Re: tables: sum columns only in certain ranges of rows
Date: Thu, 7 Jul 2016 09:02:35 +0200
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References: <87oa6db4kx.fsf@mat.ucm.es>
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To: Org Mode <emacs-orgmode@gnu.org>

Hi Uwe

On Mon, Jul 4, 2016 at 9:12 PM, Uwe Brauer <oub@mat.ucm.es> wrote:

> Is the a simple way to tell a org-table that
> it adds say two columns in a certain way $4=0.2*($2+$3)
> but only for certain values of the row. I hoped that
> a hline would help but it does not the row containing Taylor
> is treated in the same way as row 1 to 4.
>
>
> | Row | Name   | E1 | E2 | Res |
> |-----+--------+----+----+-----|
> |   1 | Smith  |  1 |  2 | 0.6 |
> |   2 | Miller |  2 |  1 | 0.6 |
> |   3 | Meyer  |  1 |  4 |  1. |
> |   4 | Wilson |  2 |  1 | 0.6 |
> |-----+--------+----+----+-----|
> |   5 | Taylor |  1 |  2 | 0.6 |
> |-----+--------+----+----+-----|
> #+TBLFM: $1=@#-1::$5=0.2*($3+$4)
>
>
> So what is the most comfortable to obtain what I want?

Depending on what you want you can use $5 = if($1 != 5, 0.2*($3+$4),
string("")). See also some other examples with if in the Org manual.

Michael