More mathimatical functions.

Richard213 · Post by **Richard213** » Sun Aug 21, 2005 6:45 pm

Considering the fact that zdoom has sin and cos, why isnt there tan? And why not expand that even further with more functions such as Atan, Atan2, Asin, Acos, and what ever else I forgot.

Post by **Graf Zahl** » Mon Aug 22, 2005 1:51 am

Nobody needs that. cos and sin are needed to get a directional vector from an angle. Atan2 may be of use but the rest doesn't sound like something we need.

dennisj1 · Post by **dennisj1** » Mon Aug 22, 2005 2:59 pm

Tan (tangent) is defined as cos/sin (or is it sin/cos?), so you can derive it in ACS, anyway.

Post by **Chris** » Mon Aug 22, 2005 4:02 pm

Still would be faster to have an opcode for it specificly. Since ACS is interpreted byte-code, it'd be faster to use one opcode for tan() than to fake it with two. Not to mention, libc could (and probably does) have special code to calculate the value faster and safer (simply doing cos(value)/sin(value) is asking for a crash if sin returns 0).