how to replicate an array

Question

I want to make a function like this

>> matdup([1 2],3,4)            %or any other input that user wish to enter
ans= 

 1     2     1     2     1     2         


        

Answer 1

Matlab has a funcion called repmat that does the same.

If you want to create a similar function, you could do something like this:

function B = matdup(A, M, N)
    [nr, nc] = size(A);
    B = zeros([nr nc] .* [M N]);
    for r = 1:M
        for c = 1:N
            rr = (r - 1) * nr + 1;
            cc = (c - 1) * nc + 1;
            B(rr:rr + nr - 1, cc:cc + nc - 1) = A;
        end
    end
end

Note this function is restricted to 2D matrices.