petscmaster 20190918
MatCreateIS
Creates a "process" unassembled matrix, assembled on each process but not across processes.
Synopsis
#include "petscmat.h"
PetscErrorCode MatCreateIS(MPI_Comm comm,PetscInt bs,PetscInt m,PetscInt n,PetscInt M,PetscInt N,ISLocalToGlobalMapping rmap,ISLocalToGlobalMapping cmap,Mat *A)
Input Parameters
 comm   MPI communicator that will share the matrix

 bs   block size of the matrix

 m,n,M,N   local and/or global sizes of the left and right vector used in matrix vector products

 rmap   local to global map for rows

 cmap   local to global map for cols

Output Parameter
A the resulting matrix
Notes
See MATIS for more details.
m and n are NOT related to the size of the map; they represent the size of the local parts of the vectors
used in MatMult operations. The sizes of rmap and cmap define the size of the local matrices.
If either rmap or cmap are NULL, then the matrix is assumed to be square.
See Also
MATIS, MatSetLocalToGlobalMapping()
Level
advanced
Location
src/mat/impls/is/matis.c
Examples
src/ksp/ksp/examples/tutorials/ex59.c.html
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages