I need to plot the summation of shifted Delta functions?

I need to do this: Summation [Al delta( n 3l) ] for l=0:4, and n= -5:15 i have written this code, but i'm stuck what do i do further. Please help

Function of Delta: function y = dd(x) % x is a vector % We create an output vector of only 0 (our default value) y = zeros(1, length(x));

% We find indexes of input values equal to 0, % and make them 1 y(find(x==0)) = 1; Main Code: n=-5:15; l=1:4; for i=1:4 A1=A*l; x1=A1*dd1(n-3*l); stem(n,x1) end

[Jan]

The formulation of the formula is not clear and the code is not readable because you forgot to use the "{} Code" button. Please improve the readability of your question.

Using "i", "l" and "1" in a code is prone to misinterpretations.