slepc-3.22.2 2024-12-02
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# SlepcArbitrarySelectionFn

A prototype of an arbitrary selection function that would be passed to EPSSetArbitrarySelection() and analogue functions in other solver types

### Synopsis

    PETSC_EXTERN_TYPEDEF typedef PetscErrorCode(SlepcArbitrarySelectionFn)(PetscScalar er,PetscScalar ei,Vec xr,Vec xi,PetscScalar *rr,PetscScalar *ri,void *ctx);

### Calling Sequence

| er | - real part of the current eigenvalue approximation
| ei | - imaginary part of the current eigenvalue approximation
| xr | - real part of the current eigenvector approximation
| xi | - imaginary part of the current eigenvector approximation
| rr | - result of evaluation (real part)
| ri | - result of evaluation (imaginary part)
| ctx | - [optional] user-defined context for private data for the arbitrary selection routine (may be NULL)

### See Also

EPSSetArbitrarySelection()

### Level

advanced

### Location

include/slepcsc.h
Index of all sys routines
Table of Contents for all manual pages
Index of all manual pages