MATLAB: How i can insert ‘L’ number of zeros after each element in a vector

Question

if x = [1,2,3,4,…] and L=3

sol: y = [1,0,0,2,0,0,3,0,0,4,…]

thanks

Answer 1

>> x = [1,2,3,4];
>> L = 3;
>> y = reshape([x;zeros(L,numel(x))],1,[])
y =
   1   0   0   0   2   0   0   0   3   0   0   0   4   0   0   0