Sorting mechanism in OPA rules

Hi All,
I have few attributes at a person entity level in my data model.
My requirement is to pick #3 oldest people from the household based on age attribute.
How do we implement Sorting mechanism in OPA? If we can perform sort, then how to pick first/last n records out of it?
Please advise.
Regards,
Mohan

Thanks Matt for the information you shared.
I have a scenario like:
lets say a family has 5 children of different ages (Bob-18, Mary-18, Jane-17,Steve-20,Charlie-20) and I need to catch the oldest 3 members but not all. so in this scenario, i need to get output like Charlie, Steve and (either Bob or Mary )
Assume all are siblings. I created few inferred relationships (although they doesnt sound good ).
"the person" is a text attribute and an identifying attribute to the person entity.
the person's id is a number attribute.
the person(the other person) is a member of the person's next elder members if
the other person is not the person and
the other person is a member of the person's siblings
I'm getting logical issues for the below rule: reason: multiple values are getting returned in the third conditoin
the person(the other person) is a member of the person's preferred elder member if
the other person is a member of the person's next elder members and
the other person's age = the greatest of the person's age for all of the person's next elder members and
the other person's id = the person's id which is the least for all of the person's next elder members for which it is the case that the person's age = the greatest of the person's age for all of the person's next elder members
If this issues gets fixed then, I need to pull oldest three members ?
I'm not getting enough points to write logic for RANKS. Can you assist me how to implement my requirement?
Also, do we have counters implementation in OPA like Counter=Counter+1?
Please share your inputs.
Regards,
Mohan

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I am loading sorted data for one of the dimension. But its is not coming in sorted fashion in outline. New member which i am adding is always coming in The end.Even though that member is in sorted format in the file.
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Camelot wrote:
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You tell Mail.app to run the script when certain conditions are met (e.g. sender address, recipient address, or one of several other conditions). Once Mail.app has decided the messages matches the conditions it calls your script.
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With the following code I would like to setup a score object for the current player.
Change it to a string(Is it correct to say parse it to a string type)
Then add it to the arraylist.
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}The thing I don't understand is why it returns 0, 1 or -1(does it have to do with the positioning according to the object is being compared with?)
What if I only use currentScore in a loop which loops every time the player restarts?
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Thanks in advance.
Edited by: Implode on Oct 7, 2009 9:27 AM
Edited by: Implode on Oct 7, 2009 9:28 AM

jverd wrote:
Implode wrote:
I have to hand in an assignment by Friday, and all I have to do still is write a method to sort the array list. Okay, if you have to write your own sort method, then the links I provided may not be that useful. They show you how to use the sort methods provided by the core API. You COULD still implement Comparable or Comparator. It would just be your sort routine calling it rather than the built-in ones.
You have two main tasks: 1) Write a method that determines which of a pair of items is "less than" the other, and 2) Figure out a procedure for sorting a list of items.
The basic idea is this: When you sort, you compare pairs of items, and swap them if they're out of order. The two main parts of sorting are: 1) The rules for determining which item is "less than" another and 2) Determining which pairs of items to compare. When you implement Comparable or create a Comparator, you're doing #1--defining the rules for what makes one object of your class "less than" another. Collections.sort() and other methods in the core API will call your compare() or compareTo() method on pairs of objects to produce a sorted list.
For instance, if you have a PersonName class that consists of firstName and lastName, then your rules might be, "Compare last names. If they're different, then whichever lastName is less indicates which PersonName object is less. If they're the same, then compare firstNames." This is exactly what we do in many real-life situations. And of course the "compare lastName" and "compare firstName" steps have their own rules, which are implemented by String's compareTo method, and which basically say, "compare char by char until there's a difference or one string runs out of chars."
Completely independent of the rules for comparing two items is the algorithm for which items get compared and possibly swapped. So, if you have 10 Whatsits (W1 through W10) in a row, and you're asked to sort them, you might do something like this:
Compare the current W1 to each of W2 through W10 (call the current one being compared Wn). If any of them are less than W1, swap that Wn with W1 and continue on, comparing the new W1 to W(n+1) (that is, swap them, and then compare the new first item to the next one after where you just swapped.)
Once we reach the end of the list, the item in position 1 is the "smallest".
Now repeat the process, comparing W2 to W3 through W10, then W3 to W4 through W10, etc. After N steps, the first N positions have the correct Whatsit.
Do you see how the comparison rules are totally independent of the algorithm we use to determine which items to compare? You can define one set of comparison rules ("which item is less?") for Whatsits, another for Strings, another for Integers, and use the same sorting algorithm on any of those types of items, as long as you use the appropriate comparison rules.Thanks ;)
massive help
I understand that now, but I am clueless on how to implement it.
Edited by: Implode on Oct 7, 2009 10:56 AM

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Thanks for the pointers and information. Unfortunately, I'm now lost in too much mostly incomprehensible information. However, the tr03.pdf doc you provided I think had the answer.
If I understand it correctly, this (new to me) sorting mechanism means that nothing comes after Z any more? (based on the PDF file you gave me, part 3.0 intro, order of characters). Is that correct?
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roy wrote:
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