diff --git a/LUA_General.cpp b/LUA_General.cpp
index 3ff741a..b870314 100644
--- a/LUA_General.cpp
+++ b/LUA_General.cpp
@@ -57,7 +57,26 @@ MyPrint( lua_State* L)
 
 //-------------------------------------------------------------------------------
 static int
-SetContext( lua_State* L)
+LuaEvalNumExpr( lua_State* L)
+{
+  // un solo parametro stringa : sExpr
+   string sExpr ;
+   LuaCheckParam( L, 1, sExpr)
+   LuaClearStack( L) ;
+  // valuto l'espressione
+   double dVal ;
+   bool bOk = ExeLuaEvalNumExpr( sExpr, &dVal) ;
+  // restituisco il risultato
+   if ( bOk)
+      LuaSetParam( L, dVal) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
+//-------------------------------------------------------------------------------
+static int
+LuaSetContext( lua_State* L)
 {
   // un solo parametro intero
    int nGseCtx ;
@@ -72,7 +91,7 @@ SetContext( lua_State* L)
 
 //-------------------------------------------------------------------------------
 static int
-GetContext( lua_State* L)
+LuaGetContext( lua_State* L)
 {
   // nessun parametro
    LuaClearStack( L) ;
@@ -422,8 +441,9 @@ LuaInstallGeneral( LuaMgr& luaMgr)
 {
    bool bOk = ( &luaMgr != nullptr) ;
    bOk = bOk && luaMgr.RegisterFunction( "print", MyPrint) ;
-   bOk = bOk && luaMgr.RegisterFunction( "EgtSetContext", SetContext) ;
-   bOk = bOk && luaMgr.RegisterFunction( "EgtGetContext", GetContext) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtEvalNumExpr", LuaEvalNumExpr) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtSetContext", LuaSetContext) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtGetContext", LuaGetContext) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtPause", LuaPause) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtStartCounter", LuaStartCounter) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtStopCounter", LuaStopCounter) ;