My Math Forum Calculating angle sin and sin angle without any functions.

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 February 26th, 2014, 02:04 PM #1 Newbie   Joined: Feb 2014 Posts: 4 Thanks: 0 Calculating angle sin and sin angle without any functions. I discovered that calling functions in c++ is a really slow process. By doing everything inside of my function, it will be like 60% faster. Is there possible to calculate angle sin and sin angle ( reverse the sin ) without any functions? For example sin angle 90 = 0. something 0.something = 90 Also, I need cos, square root, atan2 I have no idea what is atan2 but here is what it does y and x are coordinates angleyaw = (atan2(y, x) * 180.0 / PI); Basically it takes x and y and does things with them. It gets angle between 2 coordinates ( 2 vector ) I would be very grateful if someone can help me with that. Thank you!
 February 26th, 2014, 05:57 PM #2 Global Moderator   Joined: Dec 2006 Posts: 20,095 Thanks: 1905 You can hold the answers in a table, the computer equivalent of the printed tables people used before computers were available. This won't be quite as accurate as the library functions, but it will be extremely fast.

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