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null
Null space of a matrix
B=null(A)
B = null(A)
returns an orthonormal basis for the null space of A.
B'*B = I, A*B has negligible elements, and (if B is not equal to the empty matrix) the number of columns of B is the nullity of A.
orth Range space of a matrix
qr Orthogonal-triangular decomposition
svd Singular value decomposition