NEPApplyFunction#
Applies the nonlinear function T(lambda) to a given vector.
Synopsis#
#include "slepcnep.h"
PetscErrorCode NEPApplyFunction(NEP nep,PetscScalar lambda,Vec x,Vec v,Vec y,Mat A,Mat B)
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) Function matrix, for callback interface only
B - (unused) preconditioning matrix
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, parameters A and B are not used. Otherwise, the matrix T(lambda) is built and the effect is the same as a call to NEPComputeFunction() followed by a MatMult().
See Also#
NEPSetSplitOperator(), NEPComputeFunction(), NEPApplyAdjoint()
Level#
developer
Location#
Index of all NEP routines Table of Contents for all manual pages Index of all manual pages