MATLAB gr. A

a=zeros(4)+eye(4)

a = 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1

>> a(:)=[-6 -4 -2 0 -4 -2 0 2 -2 0 2 4 0 2 4 6]

a = -6 -4 -2 0 -4 -2 0 2 -2 0 2 4 0 2 4 6

>> b=((a>3)+(a> c=((a>=-3).*(a> d=sum(c)

d = -2 0 0 2

>> e=size(a)

e = 4 4

>> f=rank(c)

f = 4

>> h=sum(sum(c))

h = 0