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