Returning a table globally from lua to C

I have a method called GetParameter in C. And I want to use it from Lua. This method will again return some values ​​in Lua.

The way Im constructs a table in C is the most common way:

lua_newtable(L);
for (int i = 0; i < parameters; i++)
{
    lua_pushnumber(L,i);
    lua_pushstring(L,myParameter);
    lua_settable(L,-3);
}

In all the examples I saw, after that you should set the result table with lua setGlobal:

 //set name for the result
 lua_setglobal(ptLuaState, "resultTable");

With this method, I can access the result table in lua, for example:

GetParameter("V111","V111Parameter")
printTable(resultTable);

Doing it all goes well, but is there any other way to do this without using setglobal? I tried to do something like:

local mytable=GetParameter("V111","V111Parameter");

but does not work. Are global variables better? How can I get a result table without creating setglobal?

early!