MatLMVMSetJ0#

Allows the user to define the initial Jacobian matrix from which the LMVM-type approximation is built up.

Synopsis#

#include "petscksp.h" 
PetscErrorCode MatLMVMSetJ0(Mat B, Mat J0)

Input Parameters#

B - An LMVM-type matrix
J0 - The initial Jacobian matrix, will be referenced by B.

Notes#

A KSP is created for inverting J0 with prefix -mat_lmvm_J0_ and J0 is set to both operators in KSPSetOperators(). If you want to use a separate preconditioning matrix, use MatLMVMSetJ0KSP() directly.

If the sizes of B have not been specified (using MatSetSizes() or MatSetLayouts()) before MatLMVMSetJ0() is called, then B will adopt the sizes and layouts of J0, and these sizes will be final.

Level#

advanced

Location#

src/ksp/ksp/utils/lmvm/lmvmutils.c

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