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How to explore off diagonal elements in matrices without avoiding the for loop?

24 vues (au cours des 30 derniers jours)
I need to search if the value of off diagonal elements of many matrices are larger than a specific number. Was wondering if I can do that without using a loop.

Réponses (2)

Peng Li
Peng Li le 15 Avr 2020
Not sure if many matrices share the same size. Anyway if you store these matrices in a cell you prob have a chance using cellfun to accomplish this I think. You can use triu or tril to get all off diagonal elements.

Vasilis Chasiotis
Vasilis Chasiotis le 8 Oct 2020
Modifié(e) : Vasilis Chasiotis le 8 Oct 2020
A = randn(n,n); % a n-by-n matrix of random numbers
idx = eye(n,n); % the identity matrix of order n
if all( A(~idx) > K ) % check if all the off-diagonal elements of A are greater than K
So, you check all the off-diagonal elements of A without using a loop.


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