Okay... I'm a bit confused as to why cos(330) returns -0.991199 and using a calculator I find cos (330) returns 0.866025403784438646763723170752936 (0.866)
The result from the calculator is the one I want... why are these results different? What can I do to make cos() function differently?
hehe.. Soon after posting I found that cos() accepts radians not degrees. So I have to multiply by pi divided by 180 to convert to degrees..
So my question has changed, is there any library which will return cos() in degrees so I don't have to perform this conversion every time?
Sorry... I'm trying to go for max speed and I assumed there would be a library function that could do it better than I could
Nope, just make a macro that converts the number for you. This will make the conversion pretty fast. Also use cosf( ) if you do not need the double precision offered by cos( ). That will get you some extra speed. Also define them as intrisic if your compiler allows.Originally posted by rmullen3
Sorry... I'm trying to go for max speed and I assumed there would be a library function that could do it better than I could
"...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers
>Nope, just make a macro that converts the number for you.
Why use a macro in C++ when inline functions are just as good and far less cryptic?
-Prelude
My best code is written with the delete key.
... and when the function already does it?
Well I usually use them when I need a function to be typeless. Sure for this case you can use inline functions if you prefer.Originally posted by Prelude
>Nope, just make a macro that converts the number for you.
Why use a macro in C++ when inline functions are just as good and far less cryptic?
-Prelude
>>... and when the function already does it?
Umm... the cos( ) and cosf( ) functions do not convert degrees to radians for you.
"...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers
