petsc-3.14.5 2021-03-03
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# PCBDDCSetDivergenceMat

Sets the linear operator representing \int_\Omega \div {\bf u} \cdot p dx

### Synopsis

    #include "petscpc.h"
    PetscErrorCode PCBDDCSetDivergenceMat(PC pc, Mat divudotp, PetscBool trans, IS vl2l)

Collective on PC

### Input Parameters

| pc | - the preconditioning context
| divudotp | - the matrix (must be of type MATIS)
| trans | - if trans if false (resp. true), then pressures are in the test (trial) space and velocities are in the trial (test) space.
| vl2l | - optional index set describing the local (wrt the local matrix in divudotp) to local (wrt the local matrix in the preconditioning matrix) map for the velocities

### Notes

This auxiliary matrix is used to compute quadrature weights representing the net-flux across subdomain boundaries If vl2l is NULL, the local ordering for velocities in divudotp should match that of the preconditioning matrix

### See Also

PCBDDC

### Level

advanced

### Location

src/ksp/pc/impls/bddc/bddc.c

### Examples

src/ksp/ksp/tutorials/ex43.c.html

### Implementations

PCBDDCSetDivergenceMat_BDDC in src/ksp/pc/impls/bddc/bddc.c
Index of all PC routines
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Index of all manual pages