EPSSetEigenvalueComparison#

Specifies the eigenvalue comparison function when EPSSetWhichEigenpairs() is set to EPS_WHICH_USER.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSSetEigenvalueComparison(EPS eps,SlepcEigenvalueComparisonFn *func,void *ctx)

Logically Collective

Input Parameters#

  • eps - eigensolver context obtained from EPSCreate()

  • func - the comparison function, see EPSEigenvalueComparisonFn for the calling sequence

  • ctx - a context pointer (the last parameter to the comparison function)

Note#

The returning parameter ‘res’ can be

  • negative - if the 1st eigenvalue is preferred to the 2st one

  • zero - if both eigenvalues are equally preferred

  • positive - if the 2st eigenvalue is preferred to the 1st one

See Also#

EPSSetWhichEigenpairs(), EPSWhich

Level#

advanced

Location#

src/eps/interface/epsopts.c

Examples#

src/eps/tutorials/ex18.c
src/eps/tutorials/ex57.c

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