MatLMVMUpdate#
Adds (X-Xprev) and (F-Fprev) updates to a MATLMVM matrix.
Synopsis#
#include "petscksp.h"
PetscErrorCode MatLMVMUpdate(Mat B, Vec X, Vec F)
Input Parameters#
B - A
MATLMVMmatrixX - Solution vector
F - Function vector
Notes#
The first time this function is called for a MATLMVM matrix, no update is applied, but the given X and F vectors
are stored for use as Xprev and Fprev in the next update.
If the user has provided another MATLMVM matrix for the reference Jacobian (using MatLMVMSetJ0(), for example),
that matrix is also updated recursively.
If the sizes of B have not been specified (using MatSetSizes() or MatSetLayouts()) before MatLMVMUpdate() is
called, the row size and layout of B will be set to match F and the column size and layout of B will be set to
match X, and these sizes will be final.
See Also#
KSP: Linear System Solvers, LMVM Matrices, MATLMVM, MatLMVMReset(), MatLMVMAllocate()
Level#
intermediate
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