petsc-master 2014-10-19
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MatCreateDense

Creates a parallel matrix in dense format.

Synopsis

#include "petscmat.h"  
PetscErrorCode  MatCreateDense(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt M,PetscInt N,PetscScalar *data,Mat *A)
Collective on MPI_Comm

Input Parameters

comm - MPI communicator
m - number of local rows (or PETSC_DECIDE to have calculated if M is given)
n - number of local columns (or PETSC_DECIDE to have calculated if N is given)
M - number of global rows (or PETSC_DECIDE to have calculated if m is given)
N - number of global columns (or PETSC_DECIDE to have calculated if n is given)
data - optional location of matrix data. Set data=NULL (NULL_SCALAR for Fortran users) for PETSc to control all matrix memory allocation.

Output Parameter

A -the matrix

Notes

The dense format is fully compatible with standard Fortran 77 storage by columns.

The data input variable is intended primarily for Fortran programmers who wish to allocate their own matrix memory space. Most users should set data=NULL (NULL_SCALAR for Fortran users).

The user MUST specify either the local or global matrix dimensions (possibly both).

Keywords

matrix,dense, parallel

See Also

MatCreate(), MatCreateSeqDense(), MatSetValues()

Level:intermediate
Location:
src/mat/impls/dense/mpi/mpidense.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/tao/pde_constrained/examples/tutorials/elliptic.c.html