%ltwonorm
%This returns the l_2 norm for a finite sequence of length 7.
%the sequence is the only input.

function y = ltwonorm(x1, x2, x3, x4, x5, x6, x7)

X = [0 0 0 0 0 0 0];
X = [x1 x2 x3 x4 x5 x6 x7];

S = 0;
for i = 1:7
    S = S + X(i)^2
end

y = sqrt(S);