Re: [eclipse-clp-users] Excuse me. I want to ask a question.

Hi Tommy,

On 11/04/2012 10:13, Chen Tommy wrote:

>     But when I use the instruction  "rpc(remote predicate call)" in ECLiPSe
> that just return "null".
>

I am not sure I understand you completely -- I assume you are calling 
the the eclipse.rpc method in Java, and are you saying that you get null 
returned as a result?

It is difficult to say much about this as you don't seem to show any 
code of what you are doing. However, I am not sure I understand how an 
rpc can return null as the result, as this implies that the rpc was 
called with a variable as the goal, which I would have expected to cause 
an error to be thrown, rather than returning null...

Can you please give more information on what you have done exactly, and 
also more details on your environment (platform, ECLiPSe version used, 
etc.).

>      It's can work in integer number but can't work in real number.Can I ask
> why? Thanks for your help.
>

Again, I am not sure I understand you. Both floats and doubles can be 
used/returned in a rpc goal -- the rpc method is designed to accept a 
CompoundTerm representation of the goal you are calling, and the 
CompoundTerm can have both real (Java Float or Double) and integer 
subterms. A Goal cannot be just a float or double on its own, as these 
are not valid goals.

However, note that a CompoundTerm cannot represent all ECLiPSe terms, in 
particular variables are only place holders and unique, i.e. variables 
cannot be shared in the term (occur more than once), and you cannot pass 
attribute information back to Java via the variables. In general, you 
should do the processing in ECLiPSe, and return only ground results back 
to Java.

Cheers,

Kish



>     If I want to solve the answer in  real number domain as follow
>
>
>
>    :- lib(ic), lib(listut).
>
> testTriangleTriangle(Path, OState, Arg, Result, NState) :-
> Path>  0,
> % Domains
> [Sa] :: -127.5 .. 128.5,
> [NSa] :: -127.5 .. 128.5,
> [Sb] :: -127.5 .. 128.5,
> [NSb] :: -127.5 .. 128.5,
> [Sc] :: -127.5 .. 128.5,
> [NSc] :: -127.5 .. 128.5,
> % Constraints
> Arg = [Sa, Sb, Sc],
> NState = [NSa, NSb, NSc],
> triangleTriangle(Path, OState, Arg, Result, NState),
> % Solving
> locate([Sa],0.01),
> locate([NSa],0.01),
> locate([Sb],0.01),
> locate([NSb],0.01),
> locate([Sc],0.01),
> locate([NSc],0.01).
>
> triangleTriangle(1, [], [Sa, Sb, Sc], [], [NSideA, NSideB, NSideC]) :-
> % Precondition
> Sa + Sb $>  Sc,
> Sb + Sc $>  Sa,
> Sa + Sc $>  Sb,
> % Postcondition
> NSideA $= Sa,
> NSideB $= Sb,
> NSideC $= Sc,
> % Invariant
> NSideA + NSideB $>  NSideC,
> NSideB + NSideC $>  NSideA,
> NSideA + NSideC $>  NSideB.
>
>
>
>
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