| -- Test cosh(), sinh() and tanh() against SQL implementations. |
| -- Using a full precision test here is going to throw up small differences |
| -- in precision around the implementation in the backend. So, limit to 8 |
| -- significant figures. |
| -- If all is working as expected, we should return no rows. |
| select cosh, cosh2, sinh, sinh2, tanh, tanh2 from |
| (select cosh::numeric(20, 8), cosh2::numeric(20, 8), |
| sinh::numeric(20, 8), sinh2::numeric(20, 8), |
| tanh::numeric(20, 8), (sinh2/cosh2)::numeric(20, 8) as tanh2 from |
| (select i, cosh(i), sinh(i), tanh(i), |
| ((exp(i)::float8 + exp(-i)::float8)/2)::float8 as cosh2, |
| ((exp(i)::float8 - exp(-i)::float8)/2)::float8 as sinh2 from |
| (select i/1000. as i from generate_series(-10000, 10000, 20) i) j) k) l |
| where cosh <> cosh2 or sinh <> sinh2 or tanh <> tanh2; |
| cosh | cosh2 | sinh | sinh2 | tanh | tanh2 |
| ------+-------+------+-------+------+------- |
| (0 rows) |
| |
