Hello

Consider the following table.


| Name   | Ex 1 | Ex2 | Ex + Ex2 |
| smith  |    1 |   2 |        3 |
| miller |      |     |        0 |
#+TBLFM: $4=$2+$3


Miller has no entries in Ex1 and Ex2 but when using C-u C-u C-c C-c also
Ex2+Ex3 gets an entry namely zero. I don't like this I would prefer if
this field remains empty.

Any way of achieving this?

Uwe Brauer