petsc-dev 2014-07-22
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MatCreateIS

Creates a "process" unassmembled matrix, it is 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 map,Mat *A)

Input Parameters

comm - MPI communicator that will share the matrix
bs - local and global block size of the matrix
m,n,M,N - local and/or global sizes of the the left and right vector used in matrix vector products
map - mapping that defines the global number for each local number

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 are the size of the part of the vector owned by that process. m + nghosts (or n + nghosts) is the length of map since map maps all local points plus the ghost points to global indices.

See Also

MATIS, MatSetLocalToGlobalMapping()

Level:advanced
Location:
src/mat/impls/is/matis.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages