Multiply and shift ?
显示 更早的评论
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
回答（1 个）
R = ifftshift(xcorr(x,'unbiased'))
3 个评论
Matt J
2019-3-29
Or, if you don't have the Signal Processing ToolBox,
e=ones(size(x));
R=ifftshift( conv(x,flip(x))./conv(e,e) );
Willim
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
类别
在 帮助中心 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
