MatCreateLMVMSR1#

Creates a limited-memory Symmetric-Rank-1 approximation matrix used for a Jacobian. L-SR1 is symmetric by construction, but is not guaranteed to be positive-definite.

Synopsis#

#include "petscksp.h" 
PetscErrorCode MatCreateLMVMSR1(MPI_Comm comm, PetscInt n, PetscInt N, Mat *B)

To use the L-SR1 matrix with other vector types, the matrix must be created using MatCreate() and MatSetType(), followed by MatLMVMAllocate(). This ensures that the internal storage and work vectors are duplicated from the correct type of vector.

Collective

Input Parameters#

  • comm - MPI communicator

  • n - number of local rows for storage vectors

  • N - global size of the storage vectors

Output Parameter#

  • B - the matrix

Note#

It is recommended that one use the MatCreate(), MatSetType() and/or MatSetFromOptions() paradigm instead of this routine directly.

See Also#

KSP: Linear System Solvers, MatCreate(), MATLMVM, MATLMVMSR1, MatCreateLMVMBFGS(), MatCreateLMVMDFP(), MatCreateLMVMBrdn(), MatCreateLMVMBadBrdn(), MatCreateLMVMSymBrdn()

Level#

intermediate

Location#

src/ksp/ksp/utils/lmvm/sr1/sr1.c

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