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

• done - PETSC_TRUE or PETSC_FALSE, indicating whether the values have been returned

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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