4   IS         isrow, iscol;   /* rows and columns in submatrix, only used to check consistency */  member
153   PetscCall(ISDestroy(&Na->iscol));  in MatDestroy_SubMatrix()
185 PetscErrorCode MatCreateSubMatrixVirtual(Mat A, IS isrow, IS iscol, Mat *newmat)  in MatCreateSubMatrixVirtual()  argument
195   PetscValidHeaderSpecific(iscol, IS_CLASSID, 3);  in MatCreateSubMatrixVirtual()
201   PetscCall(ISGetLocalSize(iscol, &n));  in MatCreateSubMatrixVirtual()
209   PetscCall(PetscObjectReference((PetscObject)iscol));  in MatCreateSubMatrixVirtual()
211   Na->iscol = iscol;  in MatCreateSubMatrixVirtual()
237   PetscCall(VecScatterCreate(right, NULL, Na->rwork, iscol, &Na->rprolong));  in MatCreateSubMatrixVirtual()
277 PetscErrorCode MatSubMatrixVirtualUpdate(Mat N, Mat A, IS isrow, IS iscol)  in MatSubMatrixVirtualUpdate()  argument
286   PetscValidHeaderSpecific(iscol, IS_CLASSID, 4);  in MatSubMatrixVirtualUpdate()
293   PetscCall(ISEqual(iscol, Na->iscol, &flg));  in MatSubMatrixVirtualUpdate()