Find correlation coefficient between a row in a data and every row in another data

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Learning
Learning 2022-8-23
回答： Chunru 2022-8-23
Hi,
I have two data sets, data A an B. Data A has just a single row with 5 columns. Data B has 10 rows each with 5 columns as well. I want to find the correlation coefficients between row 1 in A and row 1 in B, then between row 1 in A and row 2 in B...till the corrcoeff between row 1 in data A and every row in data B has been computed.
After that, I want to extract those rows in B which had the highest correlation coefficient (>=0.8) with row 1 in A into another matrix called C.
Any idea would be appreciated!
Thank you.

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回答（1 个）

Chunru
Chunru 2022-8-23
Ran in:
A = randn(1, 5);
B = randn(10, 5);
r = zeros(10,1);
for i=1:10
tmp = corrcoef(A, B(i, :));
r(i) = tmp(1,2);
end
idx = (abs(r) > 0.5); % change the threshold here
V =B(idx, :)
V = 3×5
-0.9015 -0.5471 0.5020 -0.1547 2.1284 1.0707 -1.6141 1.0989 1.5863 -0.8187 -1.1413 0.3543 -1.0398 0.1434 0.8906

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