Re: JESS: Getting Facts in Sorted Order
Eric, here is the rule that will work: (defrule items-to-buy ?ItemFound - (SomethingIWant (Name ?ItemName) (Price ?ItemPrice) (Priority ?ItemPriority1) (Selected false ) ) (not (SomethingIWant (Selected false) (Priority ?p:( ?p ?ItemPriority1 = (printout t Found: ?ItemName , ?ItemPrice , ?ItemPriority1 crlf) (modify ?ItemFound (Selected true) ) ) In addition you should execute (run) at the end of the file, or from JESS prompt Dusan Sormaz PS. If you see smiley in (not ...) clause replace it by : ( . At 09:30 PM 2/13/2006, you wrote: OK, Im very, very new to JESS and rules engines, so please forgive me for a very basic question. I have read JESS in Action but Im still stumped on this one. I get that the rules engine will match all possible facts against my rule(s). I think of it as kind of an implied iteration, versus a loop in a procedural language. But, Id like to have some control over the order in which those facts are applied to my rule. For example, imagine I have a database of stuff on my wish list. I keep the name of each item and the price. And I have a rule that will match on all of the entries in the database, and do something like make a shopping list and keep a running total. So far, so good. But, I have a limited budget, and an infinite wish list. So, I want to make sure my rule matches the things I want the most, first. And this is where Im stuck. I can add a Priority slot. But, how do I write the rule to match on the higher priority facts, first? I played with a (not ) statement I saw in JESS in Action, but it doesnt quite do what Im looking for. I may have 3 priority 1 items and Ill want the rule to match on all of them, and I might have 2 priority 2 items and Ill want to rule to match on both of those. But, I want the rule to match on all of the priority 1 items before any of the priority 2 items. I pasted my test code below. Im sure I just havent gotten my mind wrapped around how you do things in this environment, yet. But, I could use a nudge in the right direction on this one. Thanks in advance for any suggestions! Eric ; Test Prioritizing Facts. (printout t crlf crlf) (clear) (reset) (deftemplate SomethingIWant Stuff I want (slot Name (default Whatever) ) (slot Price (default 10) ) (slot Priority (default 0) ) (slot Selected (default false) ) ) (assert (SomethingIWant (Name TiVo) (Price 200) (Priority 1) ) ) (assert (SomethingIWant (Name DVD Burner) (Price 400) (Priority 5) ) ) (assert (SomethingIWant (Name Wheels) (Price 1000) (Priority 2) ) ) (defrule items-to-buy ?ItemFound - (SomethingIWant (Name ?ItemName) (Price ?ItemPrice) (Priority ?ItemPriority1) (Selected false ) ) ?ItemFound2 - (SomethingIWant (Name ?ItemName2) (Price ?ItemPrice2) (Priority ?ItemPriority2) ) ; (not (eq ?ItemName ?ItemName2 ) ) (not (SomethingIWant (Priority ?ItemPriority2:( ?ItemPriority1 ?ItemPriority2 ; (test (= ?ItemPriority1 ?ItemPriority2 ) ) = (printout t Found: ?ItemName , ?ItemPrice , ?ItemPriority1 crlf) (modify ?ItemFound (Selected true) ) ) * * Duan ormaz, PhD, Associate Professor * Ohio University * Industrial and Manufacturing Systems Engineering Department * 277 Stocker Center, Athens, OH 45701-2979 * phone: (740) 593-1545 * fax: (740) 593-0778 * e-mail: [EMAIL PROTECTED] * url: http://www.ent.ohiou.edu/~sormaz *
RE: JESS: Getting Facts in Sorted Order
Thanks, but that only matches on the single set of facts with the lowest priority. I want to get all of the facts, I just want them to be given to the rule in order of priority. For example, given the following set of facts: (assert (SomethingIWant (Name TiVo) (Price 200) (Priority 1) ) ) (assert (SomethingIWant (Name Tires) (Price 800) (Priority 1) ) ) (assert (SomethingIWant (Name Carb) (Price 400) (Priority 1) ) ) (assert (SomethingIWant (Name DVD Burner) (Price 400) (Priority 5) ) ) (assert (SomethingIWant (Name Wheels) (Price 1000) (Priority 2) ) ) (assert (SomethingIWant (Name shocks) (Price 900) (Priority 2) ) ) I get the following output: TRUE Jess (run) Found: Carb, 400, 1 Found: Tires, 800, 1 Found: TiVo, 200, 1 3 Jess The output I want to see would be something like: Found: Carb, 400, 1 Found: Tires, 800, 1 Found: TiVo, 200, 1 Found: Wheels, 1000, 2 Found: shocks, 900, 2 Found: DVD Burner, 400, 5 If I can get that to work, Id have some additional logic to stop processing at some point. In this example, maybe Id keep a running total of items and stop when Ive reached my budget, but I want to make sure I get the higher priority items first. Should I maybe be setting another fact to the current priority, initialize it to 1 and just match facts that have that priority, then increment the current priority fact and match against facts that have that new priority and continue through the valid range of priorities? That just feels like Im trying to impose my procedural thinking on the rules engine. So, Im looking for a more rules friendly approach. Or maybe have separate rules that match on each individual priority and have the then part of each rule call the same function, and use salience to fire the rules in the desired order? Thanks, Eric From: owner-jess-users@sandia.gov [mailto:owner-jess-users@sandia.gov] On Behalf Of Dusan Sormaz Sent: Tuesday, February 14, 2006 7:51 AM To: jess-users@sandia.gov Subject: Re: JESS: Getting Facts in Sorted Order Eric, here is the rule that will work: (defrule items-to-buy ?ItemFound - (SomethingIWant (Name ?ItemName) (Price ?ItemPrice) (Priority ?ItemPriority1) (Selected false ) ) (not (SomethingIWant (Selected false) (Priority ?p:( ?p ?ItemPriority1 = (printout t Found: ?ItemName , ?ItemPrice , ?ItemPriority1 crlf) (modify ?ItemFound (Selected true) ) ) In addition you should execute (run) at the end of the file, or from JESS prompt Dusan Sormaz PS. If you see smiley in (not ...) clause replace it by : ( . At 09:30 PM 2/13/2006, you wrote: OK, Im very, very new to JESS and rules engines, so please forgive me for a very basic question. I have read JESS in Action but Im still stumped on this one. I get that the rules engine will match all possible facts against my rule(s). I think of it as kind of an implied iteration, versus a loop in a procedural language. But, Id like to have some control over the order in which those facts are applied to my rule. For example, imagine I have a database of stuff on my wish list. I keep the name of each item and the price. And I have a rule that will match on all of the entries in the database, and do something like make a shopping list and keep a running total. So far, so good. But, I have a limited budget, and an infinite wish list. So, I want to make sure my rule matches the things I want the most, first. And this is where Im stuck. I can add a Priority slot. But, how do I write the rule to match on the higher priority facts, first? I played with a (not ) statement I saw in JESS in Action, but it doesnt quite do what Im looking for. I may have 3 priority 1 items and Ill want the rule to match on all of them, and I might have 2 priority 2 items and Ill want to rule to match on both of those. But, I want the rule to match on all of the priority 1 items before any of the priority 2 items. I pasted my test code below. Im sure I just havent gotten my mind wrapped around how you do things in this environment, yet. But, I could use a nudge in the right direction on this one. Thanks in advance for any suggestions! Eric ; Test Prioritizing Facts. (printout t crlf crlf) (clear) (reset) (deftemplate SomethingIWant Stuff I want (slot Name (default Whatever) ) (slot Price (default 10) ) (slot Priority (default 0) ) (slot Selected (default false) ) ) (assert (SomethingIWant (Name TiVo) (Price 200) (Priority 1) ) ) (assert (SomethingIWant (Name DVD Burner) (Price 400) (Priority 5) ) ) (assert (SomethingIWant (Name Wheels) (Price 1000) (Priority 2) ) ) (defrule items-to-buy ?ItemFound - (SomethingIWant (Name ?ItemName
RE: JESS: Getting Facts in Sorted Order
Hmm, I don't think so. Copy\paste! :) I should have mentioned it before, I'm using the publicly available version 6.1p4 that I downloaded based on instructions in the book. Would that matter? I'm still waiting for my company to fill out the licensing forms to get the latest version. Thanks, Eric -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, February 14, 2006 10:30 AM To: jess-users@sandia.gov Subject: Re: JESS: Getting Facts in Sorted Order I think Eric W. Bonnett wrote: [Charset iso-8859-2 unsupported, filtering to ASCII...] Thanks, but that only matches on the single set of facts with the lowest priority. No, actually, it'll do just exactly what you want. Maybe you typed it wrong? - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
RE: JESS: Getting Facts in Sorted Order
Aha, said the blind man! :) I really did copy\paste Dusan's rule. But, I pasted just the rule into my program. And in my program I was asserting the facts before defining the rule and apparently that makes quite a difference. Now, let me see if I can grok why that is. This was just a simplified example to pose the question in. In the real application I'm working towards, I'll be loading the rules from a .clp file and then asserting the facts from a Java application. So, I think this will be OK. Thank you both very much! Eric -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, February 14, 2006 12:03 PM To: jess-users@sandia.gov Subject: Re: JESS: Getting Facts in Sorted Order I think Eric W. Bonnett wrote: Hmm, I don't think so. Copy\paste! :) I should have mentioned it before, I'm using the publicly available version 6.1p4 that I downloaded based on instructions in the book. On the off chance that there was something about this version, I tried it myself -- but it worked fine. Here's the program I ran: (deftemplate SomethingIWant Stuff I want (slot Name (default Whatever) ) (slot Price (default 10) ) (slot Priority (default 0) ) (slot Selected (default false) ) ) (defrule items-to-buy ?ItemFound - (SomethingIWant (Name ?ItemName) (Price ?ItemPrice) (Priority ?ItemPriority1) (Selected false ) ) (not (SomethingIWant (Selected false) (Priority ?p:( ?p ?ItemPriority1 = (printout t Found: ?ItemName , ?ItemPrice , ?ItemPriority1 crlf) (modify ?ItemFound (Selected true) ) ) (assert (SomethingIWant (Name TiVo) (Price 200) (Priority 1) ) ) (assert (SomethingIWant (Name Tires) (Price 800) (Priority 1) ) ) (assert (SomethingIWant (Name Carb) (Price 400) (Priority 1) ) ) (assert (SomethingIWant (Name DVD Burner) (Price 400) (Priority 5) ) ) (assert (SomethingIWant (Name Wheels) (Price 1000) (Priority 2) ) ) (assert (SomethingIWant (Name shocks) (Price 900) (Priority 2) ) ) (run) And here's the output: Found: Carb, 400, 1 Found: Tires, 800, 1 Found: TiVo, 200, 1 Found: shocks, 900, 2 Found: Wheels, 1000, 2 Found: DVD Burner, 400, 5 - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
