slepc-3.21.1 2024-04-26
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EPSPowerSetShiftType

Sets the type of shifts used during the power iteration. This can be used to emulate the Rayleigh Quotient Iteration (RQI) method.

Synopsis

#include "slepceps.h" 
PetscErrorCode EPSPowerSetShiftType(EPS eps,EPSPowerShiftType shift)
Logically Collective

Input Parameters

eps  - the eigenproblem solver context
shift  - the type of shift

Options Database Key

-eps_power_shift_type  - Sets the shift type (either 'constant' or 'rayleigh' or 'wilkinson')

Notes

By default, shifts are constant (EPS_POWER_SHIFT_CONSTANT) and the iteration is the simple power method (or inverse iteration if a shift-and-invert transformation is being used).

A variable shift can be specified (EPS_POWER_SHIFT_RAYLEIGH or EPS_POWER_SHIFT_WILKINSON). In this case, the iteration behaves rather like a cubic converging method such as RQI.

See Also

EPSPowerGetShiftType(), STSetShift(), EPSPowerShiftType

Level

advanced

Location

src/eps/impls/power/power.c

Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages