petsc-3.11.4 2019-09-28
MatCreateLocalRef
Gets a logical reference to a local submatrix, for use in assembly
Synopsis
#include "petscmat.h"
PetscErrorCode MatCreateLocalRef(Mat A,IS isrow,IS iscol,Mat *newmat)
Not Collective
Input Arguments
| A | - Full matrix, generally parallel
|
| isrow | - Local index set for the rows
|
| iscol | - Local index set for the columns
|
Output Arguments
newmat -New serial Mat
Notes
Most will use MatGetLocalSubMatrix() which returns a real matrix corresponding to the local
block if it available, such as with matrix formats that store these blocks separately.
The new matrix forwards MatSetValuesLocal() and MatSetValuesBlockedLocal() to the global system.
In general, it does not define MatMult() or any other functions. Local submatrices can be nested.
See Also
MatSetValuesLocal(), MatSetValuesBlockedLocal(), MatGetLocalSubMatrix(), MatCreateSubMatrix()
Level
developer
Location
src/mat/impls/localref/mlocalref.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages