>>> "ESF" == Eric S Fraga writes: > Uwe, > it might be easier if you explained what it is you want to do (at a > higher level) instead of trying to get us to help to fix what you have > done? OK fair enough The situation is as follows, there are two exams 1. The result of the first one is calculated as: E1+E2+E3=Result-Ex1 2. The second one Result-Ex2 (column 6, I have extracted from another table via #+BEGIN: aggregate :table Ex1 :cols "Name 'Result-Ex1 " But this is not important here. What is important is how the columns $5, and $7 are calculated. If column $2,$3, and $4 are non empty $5 is just the sum of these. The problem is $7: 1. it should be the sum of $5 and $6, *even* if $5 is empty, 2. but it should be empty if $6 is empty. #+begin_src elisp #+NAME: test | Name | E1 | E2 | E3 | Result-Ex1 | Result-Ex2 | Final | |-------+----+----+-----+------------+------------+-------| | User1 | | | | | 8 | | | User2 | | | | | | | | User3 | 1 | 0 | 3.5 | 4.5 | 5.8 | 4.8 | |-------+----+----+-----+------------+------------+-------| #+end_src Did I explain this detailed and clear enough? Uwe