PETSc version 3.15.5
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; that is ia[0] = 0, ia[col] = i[col-1] + number of elements in that col of the matrix
|
| ja | - the row indices
|
Output Parameters
See Also
MatGetRowIJ(), MatRestoreColumnIJ()
Level
developer
Location
src/mat/interface/matrix.c
Implementations
MatGetColumnIJ_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatGetColumnIJ_SeqBAIJ in src/mat/impls/baij/seq/baij.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages