841     PetscBool ismatis, isnest;  in MatConvert_Nest_IS()  local
843     PetscCall(PetscObjectTypeCompare((PetscObject)*newmat, MATIS, &ismatis));  in MatConvert_Nest_IS()
844 …PetscCheck(ismatis, PetscObjectComm((PetscObject)*newmat), PETSC_ERR_USER, "Cannot reuse matrix of…  in MatConvert_Nest_IS()
859       PetscBool ismatis, sallow;  in MatConvert_Nest_IS()  local
870         PetscCall(PetscObjectTypeCompare((PetscObject)T, MATIS, &ismatis));  in MatConvert_Nest_IS()
871 …PetscCheck(ismatis, comm, PETSC_ERR_SUP, "Cannot convert from MATNEST to MATIS! Matrix block (%" P…  in MatConvert_Nest_IS()
876         PetscCall(PetscObjectTypeCompare((PetscObject)nest[i][j], MATIS, &ismatis));  in MatConvert_Nest_IS()
877 …PetscCheck(ismatis, comm, PETSC_ERR_SUP, "Cannot convert from MATNEST to MATIS! Matrix block (%" P…  in MatConvert_Nest_IS()
1376     PetscBool ismatis;  in MatCreateSubMatrix_IS()  local
1378     PetscCall(PetscObjectTypeCompare((PetscObject)*newmat, MATIS, &ismatis));  in MatCreateSubMatrix_IS()
1379 …PetscCheck(ismatis, PetscObjectComm((PetscObject)*newmat), PETSC_ERR_ARG_WRONG, "Cannot reuse matr…  in MatCreateSubMatrix_IS()
1518   PetscBool ismatis;  in MatCopy_IS()  local
1521   PetscCall(PetscObjectTypeCompare((PetscObject)B, MATIS, &ismatis));  in MatCopy_IS()
1522   PetscCheck(ismatis, PetscObjectComm((PetscObject)B), PETSC_ERR_SUP, "Need to be implemented");  in MatCopy_IS()
1575   PetscBool ismatis;  in MatISGetAllowRepeated()  local
1580   PetscCall(PetscObjectTypeCompare((PetscObject)A, MATIS, &ismatis));  in MatISGetAllowRepeated()
1581 …PetscCheck(ismatis, PetscObjectComm((PetscObject)A), PETSC_ERR_SUP, "Not for matrix type %s", ((Pe…  in MatISGetAllowRepeated()
3233     PetscBool ismatis;  in MatAXPY_IS()  local
3234     PetscCall(PetscObjectTypeCompare((PetscObject)X, MATIS, &ismatis));  in MatAXPY_IS()
3235 …PetscCheck(ismatis, PetscObjectComm((PetscObject)Y), PETSC_ERR_SUP, "Cannot call MatAXPY(Y,a,X,str…  in MatAXPY_IS()