From: mailbox@dmitry-kazakov.de   
      
   On Mon, 09 Jan 2006 22:14:34 +0100, Ernst Murnleitner wrote:   
      
   >> Well, but it *is* FCL syntax. (false,0)(true.1) is "membership_function" as   
   >> defined on the page 18. Now, is there any good reason why   
   >> "membership_function" should not appear in operators AND, OR, XOR, NOT, IS?   
   >   
   > It is not documented and therefore most fuzzy programs will not support   
   > it, or do they?   
      
   Do you mean here FCL compilers or FCL "virtual machines" running on some   
   target hardware. Clearly, other compilers will not be conform. For a   
   virtual machine it should be no matter because a static expressions will be   
   resolved to a constant. It is a question what target the back end aim.   
      
   In my case it is a fuzzy machine learning system, which uses rules blocks   
   as training sets and builds classifiers. So the rules completely vanish in   
   the end.   
      
   If the target need to be a fuzzy controller, then FCL in its present state   
   seems ill-suited for this. It completely lacks hardware description. How   
   sensors are read and actuators are written? There could be many approaches   
   to that:   
      
   1. FCL could be extended to describe the hardware environment similar to   
   COBOL. This is probably the worst variant. Because if you say needed to   
   deal with CAN-bus, or some obscure D/A card, and FCL didn't handle it, then   
   what would you do?   
      
   2. FCL extended to become a universal-purpose language. This seems to be   
   completely unrealistic.   
      
   3. FCL embeddable in a universal-purpose language, like embedded SQL is.   
   This is technically possible, but quite awful.   
      
   4. FCL supplied as a library for a universal-purpose language. This is the   
   least effort approach, but it is becomes very difficult for small embedded   
   or real-time targets. (That was the reason why I used Ada, which is   
   portable across different hardware and OSes.) And it still does not answer   
   the question what to do with the rules. Similar approach use other   
   half-baked languages, like MATLAB/Simulink. But Simulink generates C or Ada   
   code, which is then compiled for the target. As for FCL it is not very   
   clear how rules can be compiled into code.   
      
   --   
   Regards,   
   Dmitry A. Kazakov   
   http://www.dmitry-kazakov.de   
      
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