From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: tables: sum columns only in certain ranges of rows
Date: Thu, 07 Jul 2016 12:28:22 -0400
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Michael Brand <michael.ch.brand@gmail.com> writes:

> 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
>
>

This seems to work:

--8<---------------cut here---------------end--------------->8---
#+TBLFM: $1=@#-1::@2$5..@5$5=0.2*($3+$4)
--8<---------------cut here---------------end--------------->8---

-- 
Nick