MatCreateLocalRef#
Gets a logical reference to a local submatrix, for use in assembly, that is to set values into the matrix
Synopsis#
#include "petscmat.h"
PetscErrorCode MatCreateLocalRef(Mat A, IS isrow, IS iscol, Mat *newmat)
Not Collective
Input Parameters#
A - full matrix, generally parallel
isrow - Local index set for the rows
iscol - Local index set for the columns
Output Parameter#
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#
Matrices, Mat, MATSUBMATRIX, MatCreateSubMatrixVirtual(), MatSetValuesLocal(), MatSetValuesBlockedLocal(), MatGetLocalSubMatrix(), MatCreateSubMatrix()`
Level#
developer
Location#
src/mat/impls/localref/mlocalref.c
Index of all Mat routines
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Index of all manual pages