The solver reports max iterations taken - the error for the first two eigenvalues is high - this may be expected behavior but it should be investigated.
This is from the Gaussian Mixture test set of matrices.
Arpack error in Aupp.
-> Maximum number of iterations taken.
Real nonsymmetric eigenvalue problem: A_x - lambda_x
Regular mode
Dimension of the system : 4608
Number of 'requested' eigenvalues : 8
Number of 'converged' eigenvalues : 7
Number of Arnoldi vectors generated: 17
Number of iterations taken : 801
Eigenvalues:
lambda[1]: -2.59124e-017 + 0 I
lambda[2]: 0.000515826 + 0 I
lambda[3]: 0.00235841 + 0 I
lambda[4]: 0.00506459 + 0 I
lambda[5]: 20.8791 + 0 I
lambda[6]: 17.3631 + 0 I
lambda[7]: 0.0117608 + 0 I
The solver reports max iterations taken - the error for the first two eigenvalues is high - this may be expected behavior but it should be investigated.
This is from the Gaussian Mixture test set of matrices.
Arpack error in Aupp. -> Maximum number of iterations taken. Real nonsymmetric eigenvalue problem: A_x - lambda_x Regular mode
Dimension of the system : 4608 Number of 'requested' eigenvalues : 8 Number of 'converged' eigenvalues : 7 Number of Arnoldi vectors generated: 17 Number of iterations taken : 801
Eigenvalues: lambda[1]: -2.59124e-017 + 0 I lambda[2]: 0.000515826 + 0 I lambda[3]: 0.00235841 + 0 I lambda[4]: 0.00506459 + 0 I lambda[5]: 20.8791 + 0 I lambda[6]: 17.3631 + 0 I lambda[7]: 0.0117608 + 0 I
nconv = 0 nconv = 2 nconv = 4 nconv = 6 ||A_x(1) - lambda(1)_x(1)||: 1.99065e+013 ||A_x(2) - lambda(2)_x(2)||: 1.99065e+013 ||A_x(3) - lambda(3)_x(3)||: 1.14746 ||A_x(4) - lambda(4)_x(4)||: 1.14746 ||A_x(5) - lambda(5)_x(5)||: 0.246617 ||A_x(6) - lambda(6)_x(6)||: 0.246617 ||A_x(7) - lambda(7)_x(7)||: 0.690501