PEPSetEigenvalueComparison#

Specifies the eigenvalue comparison function when PEPSetWhichEigenpairs() is set to PEP_WHICH_USER.

Synopsis#

#include "slepcpep.h" 
PetscErrorCode PEPSetEigenvalueComparison(PEP pep,SlepcEigenvalueComparisonFn *comp,void *ctx)

Logically Collective

Input Parameters#

  • pep - eigensolver context obtained from PEPCreate()

  • comp - a pointer to the comparison function

  • 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#

PEPSetWhichEigenpairs(), PEPWhich

Level#

advanced

Location#

src/pep/interface/pepopts.c

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