PETSc version 3.16.6
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MatCreateNest

Creates a new matrix containing several nested submatrices, each stored separately

Synopsis

#include "petscmat.h"   
PetscErrorCode MatCreateNest(MPI_Comm comm,PetscInt nr,const IS is_row[],PetscInt nc,const IS is_col[],const Mat a[],Mat *B)
Collective on Mat

Input Parameters

comm - Communicator for the new Mat
nr - number of nested row blocks
is_row - index sets for each nested row block, or NULL to make contiguous
nc - number of nested column blocks
is_col - index sets for each nested column block, or NULL to make contiguous
a - row-aligned array of nr*nc submatrices, empty submatrices can be passed using NULL

Output Parameter

B - new matrix

See Also

MatCreate(), VecCreateNest(), DMCreateMatrix(), MATNEST, MatNestSetSubMat(),
MatNestGetSubMat(), MatNestGetLocalISs(), MatNestGetSize(), MatNestGetISs(), MatNestSetSubMats(), MatNestGetSubMats()

Level

advanced

Location

src/mat/impls/nest/matnest.c

Examples

src/ksp/ksp/tutorials/ex81.c.html
src/snes/tutorials/ex70.c.html
src/snes/tutorials/ex73f90t.F90.html

Index of all Mat routines
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