How can I make a column matrix of different sequential elements.

I want to make vector of 20 rows and 1 column suppose this vector [1;1;1;1;2;2;2;2;2;2;3;3;4;4;4;4;4;4;5;5] please tell me a general code for this.

Answer 1

[Star Strider]

One way of doing it:

V1 = [1; 1; 1; 1];
for k1 = 2:5
    if mod(k1,2) == 1
        V1 = [V1; [1 1]'*k1];
    else
        V1 = [V1; ones(6,1)*k1];
    end
end

The V1 vector is the result.

Answer 2

[Roger Stafford]

Or perhaps you would like a probabilistic method:

 n = 20; % Length of desired vector
 p = 1/4; % Probability of transition
 v = cumsum([true;rand(n-1,1)<=p]);