@helicswalt Thank you a lot, I use #orgmode tables for putting my students'
qualifications with a weight for each test/exam (in the first line) and I usually do
$13=@1$3*$3+@1$4*$4+@1$5*$5+@1$6*$6+@1$7*$7... I have tried using
parenthesis as you example,
and I have seen that something like $6=vsum((@1$3..@1$5)*($3..$5)) works as
I wanted. Now my tables (and life) are going to be a lot simpler :-).