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

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 MATBAIJ 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 Parameter#

See Also#

Matrices, Mat, 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

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