From mboxrd@z Thu Jan  1 00:00:00 1970
From: Uwe Brauer <oub@mat.ucm.es>
Subject: problem with empty column
Date: Fri, 05 Jan 2018 09:28:30 +0100
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To: emacs-orgmode@gnu.org

Hi

Consider please the following table



| Name   | E1 | E2 | E3 | E4 | Res |
|--------+----+----+----+----+-----|
| Entry1 |    |    |    |    | NP  |
| Entry2 | 10 | 20 | 30 | 40 | 10  |
#+TBLFM: $6=if("$2" == "nan" , string("NP"),($2+$3+$4+$5)/10);E

The last column contains a string NP if the corresponding cell in the
second column is empty.

However when   I consider

| Name   | E1 | E2 | E3 | E4 | Res |
|--------+----+----+----+----+-----|
| Entry1 |    |    |    |    |  NP |
| Entry2 | 10 | 20 | 30 | 40 |  10 |
| Entry3 | 10 |    | 20 | 30 | nan |
#+TBLFM: $6=if("$2" == "nan" , string("NP"),($2+$3+$4+$5)/10);E


The last row behaves strangely the cell in the second column is *not*
empty but the cell in the third one is, nevertheless the cell in the
last column contains the string nan, which I don't understand.

Any help would be appreciated

Thanks

Uwe Brauer