Gather specially vector satisfied the condition

I want to gather specially vector that satisfied the condition :

if

np=100;

x_1n = 1.5*randn(1,np); x_n = [x_1n; 0.5*(x_1n+randn(1,np))]; X = [x_1,...,x_100]

How can I put in 100 of vector in X in MATLAB? (like creating vector space?)

Answer 1

[KSSV]

np=100;
X = zeros(np) ; 
x = 1.5*randn(np,1);
for i = 2:np
    X(:,i) = 0.5*(X(:,i-1)+randn(np,1)); 
end

[Yeachan Choi]

x_n should be 2-dimension vector(or matrix) Thank you

[KSSV]

np=100;
X = zeros(2,np,np) ; 
for i = 1:np
    x_1n = 1.5*randn(1,np); 
    x_n = [x_1n; 0.5*(x_1n+randn(1,np))]; 
    X(:,:,i) = x_n ; 
end

[Yeachan Choi]

hmm.. I should print about cov(X)....

[Yeachan Choi]

And I think It's right your first answer, because I can see in matlab that x_n is 2*100, and X is 100*100 thank you very much.