>>> "t" == tbanelwebmin  <tbanelwebmin@free.fr> writes:

> About the E format setting, you may look at documentation here:
> [[info:org#Formula syntax for Calc]]



Thanks I tried, but I think the core of the problem is that $7 needs two
ifs with two commands

#+begin_src elisp

Case I $6 empty
#+NAME: test
| Name  | E1 | E2 |  E3 | Result1 | Result2 | Final |
|-------+----+----+-----+---------+---------+-------|
| User1 |    |    |     |         |       8 |   nan |
| User2 |    |    |     |         |         |       |
| User3 |  1 |  0 | 3.5 |     4.5 |     5.8 |   4.8 |
|-------+----+----+-----+---------+---------+-------|
#+TBLFM: $5=if(typeof(vsum($2..$4)) == 12, string(" "),vsum($2..$4));E f-1::$7=if("$6" == "nan", string(" "),0.3*$5+0.6*$6);E f-1

Case II $5 empty
#+NAME: test2
| Name  | E1 | E2 |  E3 | Result1 | Result2 | Final  |
|-------+----+----+-----+---------+---------+--------|
| User1 |    |    |     |         |       8 | #ERROR |
| User2 |    |    |     |         |         | #ERROR |
| User3 |  1 |  0 | 3.5 |     4.5 |     5.8 | #ERROR |
|-------+----+----+-----+---------+---------+--------|
#+TBLFM: $5=if(typeof(vsum($2..$4)) == 12, string(" "),vsum($2..$4));E f-1::$7=if("$5" == "nan", 0.6*$6),0.3*$5+0.6*$6);E f-1

#+end_src

But even the second case does not work, sigh