MatLMVMApplyJ0Inv#

Applies some estimation of the initial Jacobian inverse to the given vector. The specific form of the application depends on whether the user provided a scaling factor, a J0 matrix, a J0 PC, or a J0 KSP object. If no form of the initial Jacobian is provided, the function simply does an identity matrix application (vector copy).

Synopsis#

#include "petscksp.h" 
PetscErrorCode MatLMVMApplyJ0Inv(Mat B, Vec X, Vec Y)

Input Parameters#

  • B - An LMVM-type matrix

  • X - vector to “multiply” with J0^{-1}

Output Parameter#

  • Y - resulting vector for the operation

See Also#

KSP: Linear System Solvers, LMVM Matrices, MATLMVM, MatLMVMSetJ0(), MatLMVMSetJ0Scale(), MatLMVMSetJ0ScaleDiag(), MatLMVMSetJ0PC(), MatLMVMSetJ0KSP(), MatLMVMApplyJ0Fwd()

Level#

advanced

Location#

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


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