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

lua_Unsigned typedef ... lua_Unsigned; The unsigned version of

luaL_callmeta[-0, +(0|1), e] int luaL_callmeta (lua_State *L, int obj, const char *e); Calls a

lua_pushvfstring[-0, +1, m] const char *lua_pushvfstring (lua_State *L, const

dofile ([filename])dofilestdindofiledofile

io.popen (prog [, mode]) This function is system dependent and is not available on all platforms. Starts program prog in a separated process and returns

3.4.1 – Arithmetic Operators Lua supports the following arithmetic operators: +: addition -: subtraction *:

debug.getuservalue (u) Returns the Lua value associated to u. If u is not a full userdata, returns nil.

lua_topointer[-0, +0, –] const void *lua_topointer (lua_State *L, int index); Converts the value at the

io.type (obj) Checks whether obj is a valid file handle. Returns the string "file" if obj is an open file handle, "closed file"