ABSTRACT It has long been known that in the case of an ill-conditioned eigenproblem (close eigenv... more ABSTRACT It has long been known that in the case of an ill-conditioned eigenproblem (close eigenvalues and/or almost parallel eigenvectors) it is often advisable to group some eigenvalues and compute a basis in the corresponding invariant subspace. Two defect correction methods based on this idea are studied and tested.
ABSTRACT It has long been known that in the case of an ill-conditioned eigenproblem (close eigenv... more ABSTRACT It has long been known that in the case of an ill-conditioned eigenproblem (close eigenvalues and/or almost parallel eigenvectors) it is often advisable to group some eigenvalues and compute a basis in the corresponding invariant subspace. Two defect correction methods based on this idea are studied and tested.
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