Lower Triangle of Matrix
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Alex Baham
le 2 Avr 2020
Commenté : John D'Errico
le 2 Avr 2020
I know that if you have a matrix A, triu(A) will fill the lower triangular matrix with zeros, but is there a way to make that ones instead of zeros? Thanks!
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John D'Errico
le 2 Avr 2020
No. You cannot tell triu to fill with ones instead of zeros. That does not mean what you are asking is impossible, just that you need to be creative in how you use these tools.
A = magic(5)
A =
17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9
triu(A) + tril(ones(size(A)),-1)
ans =
17 24 1 8 15
1 5 7 14 16
1 1 13 20 22
1 1 1 21 3
1 1 1 1 9
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