eliminate the nullspace of a matrix
11 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Hello, how can I eliminate the nullspace of a square matrix using Matlab? Thank you!
2 Commenti
John D'Errico
il 7 Ago 2017
Sorry, but eliminating the nullspace of a matrix has no meaning, just some jargon that you have made up. Define carefully what you want to do. Only you know that.
A matrix has a nullspace. That null space may be empty or not. But you cannot "eliminate" it. So what do you want to do?
Torsten
il 7 Ago 2017
If you want a basis of the row space of A, use orth(A.').
The rule is that
null(A) + orth(A.') = R^n
where n is the dimension of your matrix.
Best wishes
Torsten.
Risposta accettata
Azzi Abdelmalek
il 7 Ago 2017
If you have any matrix, square or not, you have only one possibility: remove entire rows or columns that are equal to zero
Example
A=[1 2 3 0;0 0 0 0;1 4 5 0 ;2 7 8 0]
ix=~any(A,1)
A(:,ix)=[]
iy=~any(A,2)
A(iy,:)=[]
1 Commento
Più risposte (0)
Vedere anche
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!