slepc-3.21.0 2024-03-30

NEPNLEIGSSetRKShifts

Sets a list of shifts to be used in the Rational Krylov method.

Synopsis

#include "slepcnep.h" 
PetscErrorCode NEPNLEIGSSetRKShifts(NEP nep,PetscInt ns,PetscScalar shifts[])

Collective

Input Parameters

	nep	- the nonlinear eigensolver context
	ns	- number of shifts
	shifts	- array of scalar values specifying the shifts

Options Database Key

-nep_nleigs_rk_shifts

- Sets the list of shifts

Notes

If only one shift is provided, the built subspace built is equivalent to shift-and-invert Krylov-Schur (provided that the absolute convergence criterion is used).

In the case of real scalars, complex shifts are not allowed. In the command line, a comma-separated list of complex values can be provided with the format [+/-][realnumber][+/-]realnumberi with no spaces, e.g. -nep_nleigs_rk_shifts 1.0+2.0i,1.5+2.0i,1.0+1.5i

Use ns=0 to remove previously set shifts.

Level

advanced

Location

src/nep/impls/nleigs/nleigs.c

Index of all NEP routines
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Index of all manual pages