petsc-3.7.5 2017-01-01

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.

MatGetColumnIJ

Synopsis

Input Parameters

Output Parameters

Note

See Also