slepc3.21.0 20240330
NEPApplyJacobian
Applies the nonlinear Jacobian T'(lambda) to a given vector.
Synopsis
#include "slepcnep.h"
PetscErrorCode NEPApplyJacobian(NEP nep,PetscScalar lambda,Vec x,Vec v,Vec y,Mat A)
Collective
Input Parameters
 nep   the nonlinear eigensolver context

 lambda   scalar argument

 x   vector to be multiplied against

 v   workspace vector (used only in the case of split form)

Output Parameters
 y   result vector

 A   (optional) Jacobian matrix, for callback interface only

Note
If the nonlinear operator is represented in split form, the result
y = T'(lambda)*x is computed without building T'(lambda) explicitly. In
that case, parameter A is not used. Otherwise, the matrix
T'(lambda) is built and the effect is the same as a call to
NEPComputeJacobian() followed by a MatMult().
See Also
NEPSetSplitOperator(), NEPComputeJacobian()
Level
developer
Location
src/nep/interface/nepsolve.c
Index of all NEP routines
Table of Contents for all manual pages
Index of all manual pages