math.floor (x) Returns the largest integral value smaller than or equal to x.

math.exp (x) Returns the value ex (where e is the base of natural logarithms).

math.deg (x) Converts the angle x from radians to degrees.

math.cos (x) Returns the cosine of x (assumed to be in radians).

math.ceil (x) Returns the smallest integral value larger than or equal to x.

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.

math.asin (x) Returns the arc sine of x (in radians).

math.acos (x) Returns the arc cosine of x (in radians).

math.abs (x) Returns the absolute value of x. (integer/float)

lua_yieldk[-?, +?, e] int lua_yieldk (lua_State *L, int nresults, lua_KContext ctx, lua_KFunction k); Yields a coroutine (thread). When a C function calls lua_yieldk, the running coroutine suspends its execution, and the call to lua_resume that started this coroutine returns. The parameter nresults is the number of values from the stack that will be passed as results to lua_resume. When the coroutine is resumed again, Lua calls the given co