PETSc version 3.17.4
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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,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

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

See Also

MatGetRowIJ(), MatRestoreColumnIJ()






MatGetColumnIJ_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatGetColumnIJ_SeqBAIJ in src/mat/impls/baij/seq/baij.c

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