thank u very much Wiliam Dunlap,
your function is very helpful, i been trying to find the right algo,,,and i
saw yours, it works perfectly.
i even checked with system.time function, and it's clear the cum.reset is
the best.
> system.time(ave(J, rev(cumsum(rev(is.na(J)))), FUN=cumsum))
utilisateur système écoulé
0.18 0.00 0.19
> system.time(cumsum.reset(J))
utilisateur système écoulé
0 0 0
thks
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