Just a little comment on Math Formula modul.
I have a Double column with some zeros and some other numbers in rows. I'm using Math formula to negate these numbers, like:
-1*$myDoubleColumn$. On rows with zero the result is -0.
Finally i'm using
(-1*$myDoubleColumn$)+1-1 which gives me the correct value, 0, but it tells me there is something internally wrong with Math Formula modul.
What do you think?