% A script which shows how an array can grow inside a loop

% What most people used...may not be used everywhere.
A=[];
for i=1:5
    A(i) = i^2;
end
A

% What you should use
B=[];
for i=1:5
    B = [B i^2];
end
B

D=[];
for i=1:5
    D = [D i^2];
end
D
E=[];
for i=1:5
    temp = [i i^2 i^3 i^4 i^5];
    E=[E ; temp]; % adding one more row at each iteration
end
E
G=[];
for i=1:5
    temp = [i i^2 i^3; i^4 i^5 i^6];
    G=[G ;temp]; % adding two rows at each step
end
G