[Ali Lotfian]

Hello Friend
I can create a loop by typing: forAll(mesh().C() [celli]); for parameters inside a grid with an index equal to celli. now how can i applly my calculations for parameters (such as U for example) that are 5 or 10 cell upper or lower (not lefter or righter) from the curren cell of curren loop ???
for example i want to calculate for all cells nu = 0.5×(U(celli - 10) + U(celli + 10)) insted of nu = U(celli) ; inside my loop