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

luaL_loadbufferx[-0, +1, –] int luaL_loadbufferx (lua_State *L, const char *buff,

table.unpack (list [, i [, j]]) Returns the elements from the given list. This function is equivalent to return list[i], list[i+1]

luaL_traceback[-0, +1, m] void luaL_traceback (lua_State *L, lua_State *L1, const char *msg,

select (index, ···) If index is a number, returns all arguments after argument number index; a negative number indexes from the end (-1 is the last argument)

luaL_argerror[-0, +0, v] int luaL_argerror (lua_State *L, int arg, const char *extramsg); Raises

luaL_dostring[-0, +?, –] int luaL_dostring (lua_State *L, const char *str); Loads and runs the given string

lua_pushstring[-0, +1, m] const char *lua_pushstring (lua_State *L, const char *s); Pushes the

lua_setlocal[-(0|1), +0, –] const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n); Sets the

math.tointeger (x) If the value x is convertible to an integer, returns that integer. Otherwise, returns nil.