co-variance Matrix formation

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uzmeed
uzmeed 2019-4-5
回答： BhaTTa 2025-8-14，4:39
Hi
I have 6 row matrix of size 1x6
I need to calculate the co variance of all the matrices but cov command only taking two matrices as input
I want a co variance matrix of 6x6
Regards
Uzmeed
  1 个评论
charles alexander
charles alexander 2020-11-21
{a1n a2n a6n} by {a2 a6} by {1 1}
{1 a2 a1n} {1 1} {1 sigma 36}.
try the matrix above. the last matrix on the right is the matrix you need. the one that ends with sigma 36.
i hope this helps.

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回答（1 个）

BhaTTa
BhaTTa 2025-8-14，4:39
Ran in:
I understand you want to calculate a 6x6 covariance matrix from 6 row vectors (each of size 1x6). Please refer to the solution below I have assume that you have 6 seperate row vectors:
% Example: If you have 6 row vectors like this:
row1 = [1, 2, 3, 4, 5, 6];
row2 = [2, 3, 4, 5, 6, 7];
row3 = [3, 4, 5, 6, 7, 8];
row4 = [4, 5, 6, 7, 8, 9];
row5 = [5, 6, 7, 8, 9, 10];
row6 = [6, 7, 8, 9, 10, 11];
% Combine them into a 6x6 matrix (each row is one observation)
data_matrix = [row1; row2; row3; row4; row5; row6];
% Calculate 6x6 covariance matrix
cov_matrix = cov(data_matrix);
disp('6x6 Covariance Matrix:');
6x6 Covariance Matrix:
disp(cov_matrix);
3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000 3.5000

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