>> a = [1 2 3; 4 5 6; 7 8 9; 10 11 12] a = 1 2 3 4 5 6 7 8 9 10 11 12
>> a(2,3) ans = 6
>> a(3:4, 2:3) ans = 8 9 11 12
>> a(3,:) ans = 7 8 9 >> a(:,2) ans = 2 5 8 11
>> a = [1 2 3; 4 5 6; 7 8 9]; >> b = [0 1 2; -1 0 1; -2 -1 0]; >> v = [2 0 -1]' v = 2 0 -1 >> a*v ans = -1 2 5 >> a*b ans = -8 -2 4 -17 -2 13 -26 -2 22
>> sum(a) ans = 12 15 18
>> a' ans = 1 4 7 2 5 8 3 6 9
>> zeros(2,2) ans = 0 0 0 0 >> ones(2,2) ans = 1 1 1 1
>> rand(3,3) ans = 0.7680 0.7889 0.2140 0.9708 0.4387 0.6435 0.9901 0.4983 0.3200