petsc-3.12.5 2020-03-29
MatCreateConstantDiagonal
Creates a matrix with a uniform value along the diagonal
Synopsis
#include "petscmat.h"
PetscErrorCode MatCreateConstantDiagonal(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt M,PetscInt N,PetscScalar diag,Mat *J)
Collective
Input Parameters
| comm | - MPI communicator
|
| m | - number of local rows (or PETSC_DECIDE to have calculated if M is given)
This value should be the same as the local size used in creating the
y vector for the matrix-vector product y = Ax.
|
| n | - This value should be the same as the local size used in creating the
x vector for the matrix-vector product y = Ax. (or PETSC_DECIDE to have
calculated if N is given) For square matrices n is almost always m.
|
| M | - number of global rows (or PETSC_DETERMINE to have calculated if m is given)
|
| N | - number of global columns (or PETSC_DETERMINE to have calculated if n is given)
|
| diag | - the diagonal value
|
Output Parameter
J -the diagonal matrix
Notes
Only supports square matrices with the same number of local rows and columns
See Also
MatDestroy(), MATCONSTANTDIAGONAL, MatScale(), MatShift(), MatMult(), MatGetDiagonal(), MatGetFactor(), MatSolve()
Level
advanced
Location
src/mat/impls/cdiagonal/cdiagonal.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages