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# EPS_POWER_SHIFT_CONSTANT

The power iteration will use a constant shift.

## Note

Together with `STSINVERT`, the `EPSPOWER` solver implements the inverse iteration method, i.e., it will apply \((A-\sigma I)^{-1}\) at each iteration, by solving a linear system. By default, the shift \(\sigma\) is constant and given by the user with `EPSSetTarget()`.

Details of the three variants can be found in [Hernandez et al., 2005].

## References

[Her05]

V. Hernandez, J. E. Roman, A. Tomas, and V. Vidal. Single vector iteration methods in SLEPc. Technical Report STR-2, Universitat Politècnica de València, 2005. URL: https://slepc.upv.es/documentation.

## See Also

EPS: Eigenvalue Problem Solver, `EPSPowerShiftType`, `EPSPowerSetShiftType()`, `STSetShift()`, `EPSSetTarget()`, `EPS_POWER_SHIFT_RAYLEIGH`, `EPS_POWER_SHIFT_WILKINSON`

## Level

advanced

## Location

include/slepceps.h

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