eliminate the nullspace of a matrix
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Hello, how can I eliminate the nullspace of a square matrix using Matlab? Thank you!
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Torsten
2017 年 8 月 7 日
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.
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Azzi Abdelmalek
2017 年 8 月 7 日
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,:)=[]
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