petsc-3.3-p7 2013-05-11


Returns the compressed column storage i and j indices for sequential matrices.


#include "petscmat.h" 
PetscErrorCode  MatGetColumnIJ(Mat mat,PetscInt shift,PetscBool  symmetric,PetscBool  inodecompressed,PetscInt *n,PetscInt *ia[],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.

Output Parameters

n - number of columns in the (possibly compressed) matrix
ia - the column pointers
ja - the row indices
done - PETSC_TRUE or PETSC_FALSE, indicating whether the values have been returned

See Also

MatGetRowIJ(), MatRestoreColumnIJ()

Index of all Mat routines
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Index of all manual pages