Multiply and shift ?

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Willim
Willim 2019-3-29
编辑： Catalytic 2019-3-30
I would like to have a code that can generate the maltiplication for x after shifting them many time
x=[1 2 4 1 3 4 5 1 3]
I would like to have a loop that can generate the autocorrlation for x with itself.
to illustrate;
x*x
R(1)=sum([1 2 4 1 3 4 5 1 3]*[1 2 4 1 3 4 5 1 3])/Length(x)
R(2)=sum([ 2 4 1 3 4 5 1 3]*[1 2 4 1 3 4 5 1 ])/Length(x-1)
and so forth until the R(N) computed

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回答（1 个）

Catalytic
Catalytic 2019-3-29
编辑：Catalytic 2019-3-29
R = ifftshift(xcorr(x,'unbiased'))
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Willim
Willim 2019-3-30
The results for the both codes you provide are not same
Catalytic
Catalytic 2019-3-30
编辑：Catalytic 2019-3-30
The differences I see are super-small.
x=[1 2 4 1 3 4 5 1 3];
e=ones(size(x));
R1 = ifftshift(xcorr(x,'unbiased'));
R2=ifftshift( conv(x,flip(x))./conv(e,e) );
>> difference=max(abs((R1-R2)))
difference =
3.5527e-15

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