Hi Nic,
What I meant was something like below
DIGY
public
System.Collections.Generic.List<Lucene.Net.Documents.Document>
Sort(Lucene.Net.Search.Hits Hits)
{
System.Collections.Generic.List<Lucene.Net.Documents.Document>
retList = new List<Lucene.Net.Documents.Document>();
System.Collections.Generic.List<float> scores = new
List<float>();
for (int i = 0; i < Hits.Length(); i++)
{
scores.Add(Hits.Score(i));
retList.Add(Hits.Doc(i));
}
//BUBBLE SORT Q(n)=n*n
//This is the one of the worst sorting algorithms you can ever
find. Replace it with an inteligent one.
bool anotherPassNeeded = true;
while (anotherPassNeeded)
{
anotherPassNeeded = false;
for (int i = 0; i < retList.Count-1; i++)
{
if(
CalcScore(retList[i].GetField("field2").StringValue() , scores[i] ) <
CalcScore(retList[i+1].GetField("field2").StringValue() , scores[i+1]) )
{
anotherPassNeeded = true;
float fTemp = scores[i];
scores[i] = scores[i + 1];
scores[i + 1] = fTemp;
Lucene.Net.Documents.Document doc = retList[i];
retList[i] = retList[i + 1];
retList[i + 1] = doc;
}
}
}
return retList;
}
//Your custom Score Function
float CalcScore(string FieldValue, float OriginalScore)
{
char lastChar = FieldValue[FieldValue.Length - 1];
return OriginalScore * lastChar;
}
-----Original Message-----
From: Nic Wise [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 16, 2008 1:43 PM
To: [email protected]
Subject: RE: Bubbling up "newer" records
Thanks! Do you have a URL or some sample code for how to write a custom
sort function? I am wanting it to influence the results (as a boost
does), not really sort by this one field.
Eg, if I start out with a relevance of 0.1 and 0.9, if the 0.1 one was
put in today, it may end up being 0.7, and if the 0.9 one was 3 months
old, it may be down-graded to 0.72 - so it's not just a pure sort....
I tried a quick google (and will continue once I have this new laptop
built up), but couldn't find much. Is there a snippit somewhere?
Thanks heaps!
-----Original Message-----
From: DIGY [mailto:[EMAIL PROTECTED]
Sent: 15 January 2008 20:18
To: [email protected]
Subject: RE: Bubbling up "newer" records
Hi Nic,
CustomScoreQuery or FieldScoreQuery is introduced with Lucene 2.2.
If you don't want to wait for Lucene.Net 2.2, writing a custom sort
function
and sorting the returned results -for ex.,using the "timestamp" field
and
the Score() method of Hits class- may be a quick solution.
DIGY
-----Original Message-----
From: Nic Wise [mailto:[EMAIL PROTECTED]
Sent: Tuesday, January 15, 2008 7:46 PM
To: [email protected]
Subject: Bubbling up "newer" records
Hi there
Long time user (and reader), first time poster J
Just wondering if anyone knows of a way to bubble up (ie, increase the
score on) items which are newer - either via putting a date field in the
document, or some kind of timestamp / tick count.
I have found some references to doing it in the Java version, but I
can't find many of the the classes (FieldScoreQuery, CustomScoreQuery)
in the .NET version - I assume they are new in the Java version. I
looked into replacing the Query, Weight, Scorer set, modelling it off
the Lucene.Net.Search.Spans stuff.... But nothing so far.
Am I even looking in the right place? Is it even possible?
I'm after something with a long, flat tail (so I guess I'm going to have
to write something custom regardless) - eg stuff which is 1 day old gets
a boost of 10, 1 week old is 5, 1 month is 2, over three months is 0 etc
(with a floating scale on those - think "the long tail" diagram
(http://en.wikipedia.org/wiki/The_Long_Tail), but have it hit 0 when it
flattens out.)
Anyone done this?
Thanks heaps.
Nic Wise
Lead .NET Developer, TopGear.com redevelopment.
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