4   IS         isrow, iscol;   /* rows and columns in submatrix, only used to check consistency */  member
152   PetscCall(ISDestroy(&Na->isrow));  in MatDestroy_SubMatrix()
185 PetscErrorCode MatCreateSubMatrixVirtual(Mat A, IS isrow, IS iscol, Mat *newmat)  in MatCreateSubMatrixVirtual()  argument
194   PetscValidHeaderSpecific(isrow, IS_CLASSID, 2);  in MatCreateSubMatrixVirtual()
200   PetscCall(ISGetLocalSize(isrow, &m));  in MatCreateSubMatrixVirtual()
208   PetscCall(PetscObjectReference((PetscObject)isrow));  in MatCreateSubMatrixVirtual()
210   Na->isrow = isrow;  in MatCreateSubMatrixVirtual()
236   PetscCall(VecScatterCreate(Na->lwork, isrow, left, NULL, &Na->lrestrict));  in MatCreateSubMatrixVirtual()
277 PetscErrorCode MatSubMatrixVirtualUpdate(Mat N, Mat A, IS isrow, IS iscol)  in MatSubMatrixVirtualUpdate()  argument
285   PetscValidHeaderSpecific(isrow, IS_CLASSID, 3);  in MatSubMatrixVirtualUpdate()
291   PetscCall(ISEqual(isrow, Na->isrow, &flg));  in MatSubMatrixVirtualUpdate()