X = gallery(3)X = gallery(5)
X = gallery(3) returns a badly conditioned 3-by-3 matrix.
X = gallery(5) returns a 5-by-5 matrix that poses an interesting eigenvalue problem. Using exact arithmetic, gallery(5) has a single eigenvalue at zero with algebraic multiplicity 5; and a single eigenvector. Numerical calculations, however, yield five distinct eigenvalues: two pairs of complex eigenvalues and a real eigenvalue.
For any input other than 3 or 5, gallery returns an empty matrix.
hadamard,hilb,invhilb,magic,rosser,wilkinson
(c) Copyright 1994 by The MathWorks, Inc.