No. That way lies madness. That makes sparse rows non-sparse. Such subtraction must be done implicitly, not explicitly.
On Sun, Dec 18, 2011 at 2:04 PM, Raphael Cendrillon < cendrillon1...@gmail.com> wrote: > As a follow up, would it be worth starting work on the 'brute force' job > for subtracting the average from each of the rows? >
