petsc-3.9.4 2018-09-11
MatGetColumnIJ
Returns the compressed column storage i and j indices for sequential matrices.
Synopsis
#include "petscmat.h"
PetscErrorCode MatGetColumnIJ(Mat mat,PetscInt shift,PetscBool symmetric,PetscBool inodecompressed,PetscInt *n,const PetscInt *ia[],const PetscInt *ja[],PetscBool *done)
Collective on Mat
Input Parameters
| mat | - the matrix
|
| shift | - 1 or zero indicating we want the indices starting at 0 or 1
|
| symmetric | - PETSC_TRUE or PETSC_FALSE indicating the matrix data structure should be
symmetrized
|
| inodecompressed | - PETSC_TRUE or PETSC_FALSE indicating if the nonzero structure of the
inodes or the nonzero elements is wanted. For BAIJ matrices the compressed version is
always used.
|
| n | - number of columns in the (possibly compressed) matrix
|
| ia | - the column pointers
|
| ja | - the row indices
|
Output Parameters
done -PETSC_TRUE or PETSC_FALSE, indicating whether the values have been returned
Note
This routine zeros out n, ia, and ja. This is to prevent accidental
us of the array after it has been restored. If you pass NULL, it will
not zero the pointers. Use of ia or ja after MatRestoreColumnIJ() is invalid.
See Also
MatGetRowIJ(), MatRestoreColumnIJ()
Level
developer
Location
src/mat/interface/matrix.c
Implementations
MatGetColumnIJ_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatGetColumnIJ_SeqAIJ_Color in src/mat/impls/aij/seq/aij.c
MatGetColumnIJ_SeqAIJ_Inode_Nonsymmetric in src/mat/impls/aij/seq/inode.c
MatGetColumnIJ_SeqAIJ_Inode in src/mat/impls/aij/seq/inode.c
MatGetColumnIJ_SeqBAIJ in src/mat/impls/baij/seq/baij.c
MatGetColumnIJ_SeqBAIJ_Color in src/mat/impls/baij/seq/baij.c
MatGetColumnIJ_SeqSELL_Color in src/mat/impls/sell/seq/fdsell.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages