Torture tests: what do they mean?

[Paul Dale]

(05-17-2014 08:29 PM)Dieter Wrote:  As shown earlier, you generally cannot trust the last 8 digits. So 34–8 = 26 digits is the expected accuracy here.

Except that TAN is coded in C and uses the 39 digit internal representation during the entire evaluation. I'm losing 13 digits which is a concern.

I think I've traced this to the COS series expansion losing the last five or six digits for a reason I cannot yet fathom. I'll keep poking around.


- Pauli