How to replace the diagonal elements of a matrix with 0 fro avoiding self loops?
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SUNANNA S S
il 19 Apr 2017
Commentato: tommsch
il 28 Giu 2024 alle 8:33
I have a matrix
M= 1 0 0 0 1 0
0 1 0 1 0 0
0 0 1 0 1 1
1 0 0 1 0 0
1 1 1 0 0 0
0 0 0 1 0 1
I want to replace all the diagonal elements in this matrix to 0 if it is 1.
1 Commento
Ramtin Nazerian
il 21 Dic 2022
Out = M.*-(eye(height(M))-1);
This will make all the diagonal values of your matrix zero as long as the matrix is square. hope that helps :).
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Più risposte (3)
Stephen23
il 19 Apr 2017
Modificato: Stephen23
il 19 Apr 2017
Method one: indexing:
M(1:1+size(M,1):end) = 0
Method two: eye:
M.*~eye(size(M))
1 Commento
Stephen23
il 19 Apr 2017
A strict interpretation of the question requires only diagonals equal to one get changed to zero: this is easy to implement with eye:
M.*~(eye(size(M)) & M==1)
Roger Stafford
il 19 Apr 2017
If your matrix M is not square and if you only want those diagonal elements changed to zero “if it is 1”, then you can do the following. Other diagonal elements not equal to one will remain unchanged. (Your description was perhaps a little ambiguous on this latter point.)
[m,n] = size(M);
d = 1:m+1:min(m^2,m*(n-1)+m);
f = find(M(d))==1;
M(d(f)) = 0;
4 Commenti
Zeina Abdullah
il 5 Gen 2022
@Stephen can you help me by try to answer the last question in my profile please
Christine Tobler
il 23 Mag 2017
Modificato: Christine Tobler
il 23 Mag 2017
If you are using the graph/digraph classes, you can also tell the constructor not to insert any self-loops for the diagonal elements:
g = graph(A, 'omitSelfLoops');
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