%Build a 5 x 5 square matrix

for i=1:5
    for j=1:5
        A(i,j) = i -j; %the semicolon keeps the results from being displayed
    end
end

%Build a 5 x 5 lower triangular matrix
B = zeros(5,5);
for i=1:5
    for j=1:i
        B(i,j) = i + j;
    end
end

%Build a vector
b = zeros(5,1);
for i = 1:5
    b(i) = i+2;
end

%Display results
A
B
b