How to save a vector in a for loop

I have a for loop which creates and plots a vector y. I now want to save each generated vector so I can compare them later. Does anyone have an idea? It kind of looks like this (very simplified)

for j=1:5
    y = rand(5,3)
    subplot(j)
    plot(y)
    hold on
end

now I want to compare the i-th row of y with the i-th row of all the other y's

Does anyone have an idea? All help appreciated!

Answer 1

[KSSV]

% To save a scalar in a loop to vector 
n = 10 ; 
A = zeros(n,1) ; 
for i = 1:n
    A(i) = rand ; 
end
% To save a vector in loop to a 2D matrix 
n = 10 ; m = 5 ; 
A = zeros(m,n) ; 
for i = 1:m
    A(i,:) = rand(1,n)
end
% To save a matrix in a loop to a 3D matrix 
m = 10 ;  n = 10 ; p = 5 ;  
A = zeros(m,n,p) ; 
for i = 1:p
    A(:,:,i) = rand(m,n) ; 
end