Sigma notation - two variables. 'for' loop or symsum?
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Hello
I am trying to compute a sigma summation of a simple single column vector x, where:
N = length(x)
k = 0:N/4
i = 1:N-k
I need to solve for Axx(k):
I have tried to solve this using 'for' loops and symsum function, without success. Help is hugely appreciated, thanks.
采纳的回答
Star Strider
2014-10-20
This runs:
N = length(x);
for k = 0:N/4
Axx(k+1) = 0;
for i = 1:N-k
Axx(k+1) = Axx(k+1) + x(i)*x(i+k);
end
end
I’ll let you determine if it gives the answers you expect.
更多回答（1 个）
Roger Stafford
2014-10-21
Axx = x.'*hankel(x,zeros(1,N/4+1));
2 个评论
Nate
2014-10-22
Roger Stafford
2014-10-22
That's probably because your value N is not a multiple of 4. Do this:
round(N/4)+1
instead.
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