how to create the number of equations from a correlation matrix by excluding the most correlated variables?

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Irina
Irina 2025-9-21，10:00
评论： Matt J 2025-9-21，12:22
I have a correlation matrix with several variables with different values. I would like to create all the pairs between the variables. In equestion i don't have to add the most correlated varaibles which are forbidden pairs (>0.5 and <-0.5)

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Matt J
Matt J 2025-9-21，10:40
编辑：Matt J 2025-9-21，10:43
Ran in:
That sounds like a bad idea. Normally, in MATLAB, you wouldn't write your equations in scalar form. You would write a matrix equation in terms of the covariance matrix itself, so that the variables don't have to be individually enumerated.
To zero out certain elements of the matrix, you can just do, e.g.,
Matrix=2*rand(5)-1
Matrix = 5×5
0.1437 0.0614 -0.0388 0.6845 -0.8494 -0.6830 0.8140 -0.5093 -0.0253 0.5441 0.8851 0.3720 0.1982 0.6276 -0.7369 -0.8184 -0.1437 0.0993 -0.0809 -0.5629 0.5320 -0.7783 0.3990 -0.5697 -0.5892
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Matrix(abs(Matrix)>0.5) = 0
Matrix = 5×5
0.1437 0.0614 -0.0388 0 0 0 0 0 -0.0253 0 0 0.3720 0.1982 0 0 0 -0.1437 0.0993 -0.0809 0 0 0 0.3990 0 0
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Irina
Irina 2025-9-21，11:10
Thanks a lot Matt. i'm new in Matlab, now i got the point. By excluding the strong correlated variables i can only create combinations where i have values. But if i will create a sepparate excel file and upload in Matlab with already forbidden pairs. Like in lotto for example i have numbers (1-49) and i have to create all combinations with 6 numbers and the forbidden pairs would be the same number. This logic can be given by Matlab?

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