Correlation with two matrices

20 次查看（过去 30 天）
Felicia DE CAPUA
Felicia DE CAPUA 2022-12-12
评论： Felicia DE CAPUA 2022-12-14
Hi everyone,
I would like to find the correlation about two matrices the same dimensions. I have two matrices with 64 channles and I need to find the correlation between the first value of first matrix and the first, second, third.... until sixty-four value of second matrix and viceversa.
How can I do this?
Thanks a lot!

请先登录，再回答此问题。

回答（2 个）

David Hill
David Hill 2022-12-12
Ran in:
You could just manually do it yourself.
A=randi(100,10);B=randi(100,10);
M=mean(A);N=mean(B);
r=zeros(size(A,2),size(B,2));
for m=1:size(A,2)
for n=1:size(B,2)
r(m,n)=sum((A(:,m)-M(m)).*(B(:,n)-N(n)))/sqrt(sum((A(:,m)-M(m)).^2.*(B(:,n)-N(n)).^2));
end
end
r
r = 10×10
-0.7325 -1.5279 0.5441 -1.1353 1.3671 -1.9351 -1.4018 0.8595 0.3189 0.8992 0.0661 0.1537 0.7952 0.6901 -0.5238 0.0602 -1.4856 1.2302 -0.9858 0.1995 -1.1532 -2.2351 1.1573 1.5280 -0.2541 -0.0752 0.8163 0.5013 -0.5230 -0.5775 0.1300 -0.4017 -0.7430 -0.1586 0.9928 -1.7321 0.4399 -0.2708 -0.7359 -0.3293 -0.8045 -1.8755 1.9652 2.4100 -0.1757 -0.6482 -0.6868 1.0841 0.0492 -1.6882 -0.1862 0.4648 -0.0476 -0.4808 0.2425 -0.5745 -0.6061 1.5960 0.0200 0.6626 -0.8411 -0.0155 0.0680 -0.9309 1.0928 0.8641 -0.5821 0.6830 0.5620 -0.2508 -0.4532 -0.6661 1.2019 1.5538 -0.9566 0.6813 1.0478 -0.1999 1.4598 -1.1943 -0.0501 -0.1554 -0.2710 -0.9457 -0.5791 0.9445 0.1837 0.7055 -0.0926 1.7323 -2.1825 -0.8110 2.0911 1.4211 0.6435 -1.3528 -0.0415 0.1698 2.3680 -1.8121
Bora Eryilmaz
Bora Eryilmaz 2022-12-12
编辑：Bora Eryilmaz 2022-12-12
Ran in:
You can compute the pairwise correlation between columns of matrices as follows:
% Data matrics with 64 channels (columns)
A = rand(10,64);
B = rand(10,64);
% Vector of pairwise correlation values
C = corr(A,B); % All pairs of columns
C = diag(C) % Matching pairs of columns
C = 64×1
0.1045 0.2102 -0.1445 -0.0380 0.3045 -0.2592 0.2869 -0.5510 0.1050 0.0790
  3 个评论
显示 1更早的评论
Bora Eryilmaz
Bora Eryilmaz 2022-12-14
编辑：Bora Eryilmaz 2022-12-14
Ran in:
Your code seems unnecessarily complicated. If you already have the matrices L and R, the correlations variable need not be a cell array. Something like this should work:
% Data matrics with 64 channels (columns)
L = rand(100,64);
R = rand(100,64);
% Vector of pairwise correlation values
C = corr(L,R); % All pairs of columns
correlations = diag(C) % Matching pairs of columns
corerlations = 64×1
0.1035 -0.0462 -0.0224 -0.0031 -0.0396 -0.1127 0.0125 -0.0144 0.0199 -0.1041
The second loop that goes over the columns of L and R matrices is not needed since the corr() command already handles that for you, given the whole matrices. Unless of course if your L and R "matrices" have a more complicated structure, like being cell arrays, etc.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by