Your are thinking about the 2D array in the shift register, right? If
so then right click on the left shift register and create an empty 2D
array and wire it into the shift register terminal from the outside of
the loop. This will initialize the shift register. Uninitilized shift
registers are nice to use when you want to keep in memory the results
from previous changes, e.g. to use a VI with a loop as a global (check
out "functional globals"), otherwise though you should initialize the
shift registers.
