petscmaster 20200809
MatLMVMSetJ0
Allows the user to define the initial Jacobian matrix from which the LMVM approximation is built up. Inverse of this initial Jacobian is applied using an internal KSP solver, which defaults to GMRES. This internal KSP solver has the "mat_lmvm_" option prefix.
Synopsis
#include "petscksp.h"
PetscErrorCode MatLMVMSetJ0(Mat B, Mat J0)
Note that another LMVM matrix can be used in place of
J0, in which case updating the outer LMVM matrix will
also trigger the update for the inner LMVM matrix. This
is useful in cases where a fullmemory diagonal approximation
such as MATLMVMDIAGBRDN is used in place of J0.
Input Parameters
 B   An LMVMtype matrix

 J0   The initial Jacobian matrix

See Also
MatLMVMSetJ0PC(), MatLMVMSetJ0KSP()
Level
advanced
Location
src/ksp/ksp/utils/lmvm/lmvmutils.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages