EPSSetPurify#

Disable eigenvector purification (which is enabled by default).

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSSetPurify(EPS eps,PetscBool purify)

Logically Collective

Input Parameters#

  • eps - the linear eigensolver context

  • purify - whether purification is done or not, use PETSC_FALSE to disable it

Options Database Key#

  • -eps_purify - toggles the purification flag

Notes#

By default, eigenvectors of generalized symmetric eigenproblems are purified in order to purge directions in the nullspace of matrix \(B\). If the user knows that \(B\) is non-singular, then purification can be safely deactivated and some computational cost is avoided (this is particularly important in interval computations).

More details are given in section Purification of Eigenvectors.

See Also#

EPS: Eigenvalue Problem Solver, Purification of Eigenvectors, EPSGetPurify(), EPSSetInterval()

Level#

intermediate

Location#

src/eps/interface/epsopts.c

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