From mboxrd@z Thu Jan  1 00:00:00 1970
From: Uwe Brauer <oub@mat.ucm.es>
Subject: tables: sum columns only in certain ranges of rows
Date: Mon, 04 Jul 2016 19:12:14 +0000
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To: emacs-orgmode@gnu.org

Hi

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?

Thanks

Uwe Brauer