[rules-users] averages on different data types

[Edson Tirelli]

   Chris,

   Not sure what you mean. If you want to know what is in there for debug
purposes, I guess the best way is to implement your own average() accumulate
function that prints out (or do whatever you want) with the bound
variables/facts.

   For regular use, it does not makes sense to allow access to such variable
because it is bound to multiple values. For instance:

$tot : Number() from accumulate(
    Order( $value : value ),
    sum( $value ) )

    This pattern will sum all the values from all the Order facts in the
working memory. Lets imagine that it would be possible to access the $value
variable outside the accumulate, what Order would it be bound to? So, it
makes no sense...

     []s
     Edson

2009/6/17 Chris Richmond <crichmond at referentia.com>

>  So how can I access variables that I have populated from within that
> scope delimiter(accumulate)?  For instance if I did want to access the
> delayTime, what strategy should be used?
>
>
>
> Thanks,
>
>
> Chris
>  ------------------------------
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Edson Tirelli
> *Sent:* Wednesday, June 17, 2009 11:49 AM
> *To:* Rules Users List
> *Subject:* Re: [rules-users] averages on different data types
>
>
>
>
>    Chris,
>
>    Remember that accumulate is a scope delimiter, meaning variables bound
> inside accumulate are not visible outside of it. The error message you see
> is the MVEL way of saying: non-existing variable (I guess you are using mvel
> as the dialect for the consequence).
>
>    If you want to know what data objects are being inserted/expired from
> the working memory, use a working memory listener.
>
>    []s
>    Edson
>
> 2009/6/17 Chris Richmond <crichmond at referentia.com>
>
> Hi guys,
>
>
>
> Building from the stockticker sample, I have been running my own average
> aggregates over time and window length and I have the following rule…it
> simply runs a last 10 average and outputs the average(in theory).
>
>
>
> rule "show averages"
>
> when
>
>
>
>             $n : Number( doubleValue > 0 ) from accumulate (
>
>
>
>
>
>
>
>             $mdo : MyDataObject($tm: delayTime) over window:length(10) from
> entry-point "DataObject stream",
>
>             average( $tm )
>
>
>
>         )
>
>
>
>
>
> then
>
>
>
>     System.err.println($tm);
>
>
>
> End
>
>
>
> I have set the limit to 0 for the average because I simply want to have it
> fire every time, no matter the average(they are all positive)
>
>
>
>
>
> However I get this error:
>
>
>
> Unable to build expression for 'consequence': Failed to compile: 1
> compilation error(s):
>
>  - (1,3) unqualified type in strict mode for: $tm '
>
>     System.err.println($tm);
>
> ' : [Rule name='show averages']
>
>
>
>
>
> If I have the consequence
>
>
>
> System.err.println($n);
>
>
>
> Then it outputs the average no problem, but I am trying to simply output
> that indifidual value, delayTime which I have stored in $tm is an integer,
> so I cannot figure out why I cannot output this value.    Similarly if I
> simply try as a consequence:
>
>
>
> System.err.println($ mdo.delayTime);
>
>
>
> I get a similar error.
>
>
>
> What am I doing wrong?
>
>
>
> Thanks,
>
>
> Chris
>
>
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>
>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss, a division of Red Hat @ www.jboss.com
>
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>
>


-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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