|MATLAB Function Reference|
Condition number with respect to eigenvalues
c = condeig(A)
returns a vector of condition numbers for the eigenvalues of
A. These condition numbers are the reciprocals of the cosines of the angles between the left and right eigenvectors.
[V,D,s] = condeig(A)
is equivalent to
Large condition numbers imply that
A is near a matrix with multiple eigenvalues.