petsc-3.14.5 2021-03-03
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# 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

MatLMVMSetJ0(), MatLMVMSetJ0Scale(), MatLMVMSetJ0ScaleDiag(),
MatLMVMSetJ0PC(), MatLMVMSetJ0KSP(), MatLMVMApplyJ0Fwd()

### 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