How to find correlations of corresponding rows of two arrays?

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Rabeca Mohammed
Rabeca Mohammed 2021-11-22
评论： Rabeca Mohammed 2021-11-23
I have 2 arrays --- d1 and d2. d1 = [ 3 4 5 6 7 ; 8 9 10 11 12 ; 13 14 15 16 17 ]; and d2 = [ 18 19 20 21 22 ; 23 24 25 26 27 ; 28 29 30 31 32 ]. How do I find the correlation of each corresponding row? For example, what is the correlation of the first row of d1 ( [ 3 4 5 6 7 ] ) to the first row of d2 ( [ 18 19 20 21 22 ] ). Similarly, what are the two coefficients for the other two corresponding rows?
I tried the following code:
[r, pV]=corr(d1,d2,'rows','complete');
But it seems to return the coefficient of each cell with respect to all the cells. In this case, I want only 3 integers returned (each for each corresponding row). Any ideas on achieving this? Appreciate your assistance!

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Dave B
Dave B 2021-11-22
编辑：Dave B 2021-11-22
Ran in:
The correlations of columns are the diagonal of the correlation matrix, so you can
  • Transpose your matrices on the way in to corr, because you want rows not columns
  • Use diag to get the diagonal specifically out of the matrix
d1 = rand(3,5);
d2 = rand(3,5);
C=corr(d1',d2')
C = 3×3
-0.2127 0.6956 0.0173 -0.6065 0.9023 0.4460 0.1537 -0.4428 -0.0161
diag(C)
ans = 3×1
-0.2127 0.9023 -0.0161
% Check that it's the same result as taking the correlations of each row
% indpendently
[corr(d1(1,:)',d2(1,:)') corr(d1(2,:)',d2(2,:)') corr(d1(3,:)',d2(3,:)')]'
ans = 3×1
-0.2127 0.9023 -0.0161

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