eps = 2^(-52), which is roughly 2.22e-16.
B =
8 7 6 5 4 3 2 1 0
» B=B+(B==0)*eps
B =
Columns 1 through 7
8.0000 7.0000 6.0000 5.0000 4.0000 3.0000 2.0000
eps = 2^(-52), which is roughly 2.22e-16.
B =
8 7 6 5 4 3 2 1 0
» B=B+(B==0)*eps