> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
> Behalf Of Ernest Friedman-Hill
> Sent: Tuesday, 27 April, 1999 14:29
> To: [EMAIL PROTECTED]
> Subject: Re: JESS: Possible bug
>
>
> The 'if' statement you've written looks as if it should be OK, but
> it's rather a dark corner of language syntax, and there may indeed be
> a bug there. Did you try the equivalent, but probably functional
>
> (if (eq ?myVar 0) then (bind $?arrayToUse $?arrayA)
> else (bind $?arrayToUse $?arrayB))
>
> I'll have a look at why the other form is broken.
>
> I think Kenny Macleod wrote:
> >
> > Folks,
> >
> > I think I may have run into a possible bug in Jess 4.4. On the other
> > hand, I could just be doing something daft and not realising it.
> >
> > I am trying to invoke the (call) function on a Java static method. This
> > method takes a single argument, an array of bytes.
> >
> > In the rules, this argument can be one of two pre-defined multivariable
> > values, call them $?arrayA and $?arrayB. Now, I can call the method
> > using the following syntax:
> >
> > (call mypackage.myclass mymethod $?arrayA)
> >
> > That works fine. However, I want to select the argument to pass
> > depending on the value of another variable, call it ?myvar:
> >
> > (bind $?arrayToUse (if (eq ?myvar 0) then $?arrayA else
> > $?arrayB))
> > (call mypackage.myclass mymethod $?arrayToUse)
> >
> > When I try it this way, I get a Rete exception ("method mymethod not
> > found or invalid argument types").
> >
> > Am I using the multivariable values correctly, or is the 'if' statement
> > returning values of the wrong type here? After further poking around,
> > it seems that the $?arrayToUse variable is of type RU.MULTIFIELD. The
> > ReteException, however, is being thrown from within
> > Jess.Value.listValue(), which only accepts values of type RU.LIST.
> >
> > Any thoughts on what's going wrong here?
> >
> > Regards
> >
> >
> > Kenny
> >
> >
> > ------------------------------------------------------
> > Kenny MacLeod |
> > | Email: [EMAIL PROTECTED]
> > Mutant Technology Ltd | Tel: (+44) 171 257 9988
> > 12-13 Henrietta Street | Fax: (+44) 171 836 2600
> > London, UK WC2E 8LH | WWW: www.mutant-tech.com
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> >
>
>
> ---------------------------------------------------------
> Ernest Friedman-Hill
> Distributed Systems Research Phone: (925) 294-2154
> Sandia National Labs FAX: (925) 294-2234
> Org. 8920, MS 9214 [EMAIL PROTECTED]
> PO Box 969 http://herzberg.ca.sandia.gov
> Livermore, CA 94550
>
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