SQL & PL/SQL :: Calculate Two Parameters A And B Which Are Interdependent?

I want to calculate two parameters A and B which are interdependent. Unfortunately, my code is not working correctly:

create table temp_res1 as
select *
from temp_res
model
dimension by (rn)
measures ( 0 as A,
0 as B

[code]....

The correct result should be:

create table temp_res (rn integer, a integer, b integer);
insert into temp_res values(1, 5, 10);
insert into temp_res values(2, 11, 6);
insert into temp_res values(3, 7, 12);
insert into temp_res values(4, 13, 8);
insert into temp_res values(5, 9, 14);
insert into temp_res values(6, 15, 10);
insert into temp_res values(7, 11, 16);
insert into temp_res values(8, 17, 12);

but I get:

create table temp_res (rn integer, a integer, b integer);
insert into temp_res values(1, 5, 10);
insert into temp_res values(2, 11, 6);
insert into temp_res values(3, 1, 12);
insert into temp_res values(4, 1, 2);
insert into temp_res values(5, 1, 2);
insert into te