EPSSetPurify#

Deactivate eigenvector purification (which is activated 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 required or not

Options Database Key#

  • -eps_purify - Sets/resets the boolean flag ‘purify’

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).

See Also#

EPS: Eigenvalue Problem Solver, EPSGetPurify(), EPSSetInterval()

Level#

intermediate

Location#

src/eps/interface/epsopts.c

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