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**Subject**: **Re: math.atan2() return to standard build ?**
**From**: Tim Hill <drtimhill@...>
**Date**: Mon, 20 Feb 2017 16:36:07 -0800

> On Feb 20, 2017, at 4:12 PM, nobody <nobody+lua-list@afra-berlin.de> wrote:
>
> On 2017-02-21 01:08, Tim Hill wrote:
>> Fortunately, most of the game engines are still on Lua 5.2 and so
>> have math.atan2(), and those on 5.3 mostly to have thrown the
>> necessary switch to retain the old math functions in the 5.3 build.
>> *snip*
>
> It never went away! Just leave off the '2'. :)
>
>> # math.atan (y [, x])
>>
>> Returns the arc tangent of y/x (in radians), but uses the signs of
>> both parameters to find the quadrant of the result. (It also handles
>> correctly the case of x being zero.)
>>
>> The default value for x is 1, so that the call math.atan(y) returns
>> the arc tangent of y.
>>
>> -- https://www.lua.org/manual/5.3/manual.html#pdf-math.atan
>
> -- nobody
>
Doh! I’d never even noticed that change .. thanks for pointing this out! :)
—Tim