[rules-users] Rule problem
Greg Barton
greg_barton at yahoo.com
Mon May 4 17:30:05 EDT 2009
I wonder if there's some way to introduce strictfp into the drl. (I'm not even sure if that would even solve the problem. But I figure it'd get you in the ballpark.) But I think it would be useful to be able to inject strictfp into the declarations of any generated drools classes.
--- On Mon, 5/4/09, Femke De Backere <femmyke at gmail.com> wrote:
> From: Femke De Backere <femmyke at gmail.com>
> Subject: Re: [rules-users] Rule problem
> To: "Rules Users List" <rules-users at lists.jboss.org>
> Date: Monday, May 4, 2009, 4:11 PM
> I solved the problem by removing every double in the
> sample.drl. How
> van I fix the double problem if I really wanted to :)? In
> this case it
> is unnecassary but there must be a solution?
>
> Thanks for all the help!
>
> Femke
>
> Op 4-mei-09, om 21:48 heeft Wolfgang Laun het volgende
> geschreven:
>
> > Don't use doubles. Try the same thing, scaling the
> random weights
> > with 10 (or 100) convert to int, and use suitably
> scaled integer
> > limits for your weight classes.
> >
> > I'm not at all sure, what various JVM versions
> and/or Rand
> > generators could produce.
> >
> > The javadoc for java.lang.Math is an indicator that
> things might not
> > be as simple as they ought to be.
> >
> > I could reproduce the problem this afternoon, but now
> I can't any
> > more, on the same machine, same JVM and same Drools
> version.
> >
> > -W
> >
> >
> > 2009/5/4 Femke De Backere <femmyke at gmail.com>
> > So, I did as you suggested, with the following as
> result:
> > BMI of 10 U heeft ondergewicht: 10
> > BMI of 30 U heeft ondergewicht: 30
> > BMI of 30 U heeft obesitas: 30
> > BMI of 20 U heeft ondergewicht: 20
> >
> > So, I really don't get it, I used exactly the same
> code as you.
> >
> > Femke
> >
> > Op 4-mei-09, om 17:11 heeft Greg Barton het volgende
> geschreven:
> >
> >>
> >> Well, approach this systematically, then: Create a
> new Drools
> >> project in Eclipse and replace the DroolsTest.java
> and Sample.drl
> >> with the ones I sent before. What results do you
> get? If they are
> >> correct, modify the project one step at a time
> until the problem is
> >> uncovered.
> >>
> >> One place to focus on: you're using rule
> flows. I have no idea how
> >> that could cause a false positive result like
> you've seen, but you
> >> never know.
> >>
> >> Finally, if you're comparing performance of
> rules vs plain java,
> >> plain java will easily win in this case. The rule
> of thumb is
> >> this: if you can easily write a plain non-rules
> algorithm it will
> >> outperform the rules solution.
> >>
> >> --- On Mon, 5/4/09, Femke De Backere
> <femmyke at gmail.com> wrote:
> >>
> >>> From: Femke De Backere
> <femmyke at gmail.com>
> >>> Subject: Re: [rules-users] Rule problem
> >>> To: "Rules Users List"
> <rules-users at lists.jboss.org>
> >>> Date: Monday, May 4, 2009, 6:53 AM
> >>> I'm using this:
> >>> package bmi
> >>>
> >>> import bmi.DroolsTest.BMIClass;
> >>>
> >>> rule "Overgewicht"
> >>> ruleflow-group "BMIrules"
> >>> when
> >>> bmiClass : BMIClass($bmi: bmi >= 25, bmi
> < 30)
> >>> then
> >>> System.out.println("U heeft
> overgewicht: " +
> >>> $bmi);
> >>> end
> >>>
> >>> rule "Obesitas"
> >>> ruleflow-group "BMIrules"
> >>> when
> >>> bmiClass : BMIClass($bmi : bmi >= 30)
> >>> then
> >>> System.out.println("U heeft obesitas:
> " +
> >>> $bmi);
> >>> end
> >>>
> >>>
> >>> rule "Ondergewicht"
> >>> ruleflow-group "BMIrules"
> >>> when
> >>> bmiClass : BMIClass($bmi : bmi < 18.5)
> >>> then
> >>> System.out.println("U heeft
> ondergewicht: " +
> >>> $bmi);
> >>> end
> >>>
> >>>
> >>> rule "Normaal"
> >>> ruleflow-group "BMIrules"
> >>> when
> >>> bmiClass : BMIClass($bmi : bmi >= 18.5,
> bmi < 25)
> >>> then
> >>> System.out.println("U heeft een normaal
> gewicht:
> >>> " + $bmi);
> >>> end
> >>>
> >>> But in essence it is the same as Greg's. I
> get outputs
> >>> as:
> >>>
> >>> U heeft ondergewicht: 25.0
> >>> U heeft overgewicht: 25.0
> >>>
> >>> But I really don't see the problem.
> >>>
> >>> Femke
> >>>
> >>> Op 4-mei-09, om 13:25 heeft Wolfgang Laun het
> volgende
> >>> geschreven:
> >>>
> >>>> I cannot reproduce your findings.
> >>>> Which bmi values cause the firing of two
> rules?
> >>>> Are you using exactly the same .drl file
> Greg sent?
> >>>> -W
> >>>>
> >>>> 2009/5/4 Femke De Backere
> <femmyke at gmail.com>
> >>>> Thanks for the answer! But I sometimes get
> 2 rules
> >>> that are correct,
> >>>> and that is impossible. I embedded
> Greg's
> >>> DroolsTest class in my
> >>>> class (I am doing some test on performance
> and
> >>> studying the
> >>>> difference between performance with a
> plain java
> >>> class), and it
> >>>> still doesn't work, and I really
> don't see
> >>> why. Anyone any
> >>>> suggestions, in attachement, my class.
> >>>>
> >>>> Thx,
> >>>>
> >>>> Femke
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> Op 4-mei-09, om 02:47 heeft Greg Barton
> het volgende
> >>> geschreven:
> >>>>
> >>>> Try the attached code.
> >>>>
> >>>> --- On Sun, 5/3/09, Femke De Backere
> >>> <femmyke at gmail.com> wrote:
> >>>>
> >>>> From: Femke De Backere
> <femmyke at gmail.com>
> >>>> Subject: Re: [rules-users] Rule problem
> >>>> To: "Rules Users List"
> >>> <rules-users at lists.jboss.org>
> >>>> Date: Sunday, May 3, 2009, 6:18 PM
> >>>> Thx for the answer. I tried this but I
> doesn't
> >>> seem to
> >>>> work. For a BMI of 20, i get the result
> >>>> "ondergewicht", and it should be
> >>>> "normal".
> >>>>
> >>>> Op 4-mei-09, om 01:04 heeft Ingomar Otter
> het volgende
> >>>> geschreven:
> >>>>
> >>>> Femke,
> >>>> The "Overgewicht| rule matches for
> _two_ BMIClass
> >>>> facts, one with bmi >- 25 and one for
> BMIClass
> >>> <30.
> >>>> If you want to apply multiple constraints
> to a single
> >>>> fact you have to list them as such:
> >>>>
> >>>> rule "Overgewicht"
> >>>> when
> >>>> bmiClass : BMIClass(bmi
> >= 25
> >>> && bmi
> >>>> <30)
> >>>> then
> >>>> System.out.println("U
> heeft
> >>>> overgewicht");
> >>>> end
> >>>>
> >>>>
> >>>> Cheers,
> >>>> Ingomar
> >>>>
> >>>>
> >>>> Am 04.05.2009 um 00:48 schrieb Femke De
> Backere:
> >>>>
> >>>> Hi!
> >>>>
> >>>> I want to make en BMI rule application, so
> I need
> >>>> to test the BMI values. But in rule
> >>> "Overgewicht"
> >>>> and "Normaal", I need to use an
> AND, but it
> >>>> doesn't seem to work in any way I
> tried.
> >>>>
> >>>> Does anybody see the problem? The rest of
> the
> >>>> application is based on de sample project
> (created
> >>> when
> >>>> making a new Drools project).
> >>>>
> >>>> Thx,
> >>>>
> >>>> Femke
> >>>>
> >>>> package bmi
> >>>>
> >>>> import bmi.DroolsTest.BMIClass;
> >>>>
> >>>> rule "Overgewicht"
> >>>> when
> >>>> bmiClass : BMIClass(bmi
> >= 25)
> >>>> bmiClass : BMIClass(bmi <
> 30)
> >>>> then
> >>>> System.out.println("U
> heeft
> >>>> overgewicht");
> >>>> end
> >>>>
> >>>> rule "Obesitas"
> >>>> when
> >>>> bmiClass : BMIClass($bmi :
> bmi >=
> >>> 30)
> >>>> then
> >>>> System.out.println("U
> heeft
> >>>> obesitas");
> >>>> end
> >>>>
> >>>> rule "Ondergewicht"
> >>>> when
> >>>> bmiClass : BMIClass($bmi :
> bmi <
> >>> 18.5)
> >>>> then
> >>>> System.out.println("U
> heeft
> >>>> ondergewicht");
> >>>> end
> >>>>
> >>>> rule "Normaal"
> >>>> when
> >>>> bmiClass : BMIClass(bmi
> >= 18.5)
> >>>> bmiClass : BMIClass(bmi <
> 25)
> >>>> then
> >>>> System.out.println("U
> heeft een
> >>> normaal
> >>>> gewicht");
> >>>>
> >>>> end
> >>>
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> >>>> <
> >>>> DroolsTest
> >>>>
> >>>
> .java><Sample.drl>_______________________________________________
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