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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.
> --

-- nobody