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https://issues.apache.org/jira/browse/LUCENENET-111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12580080#action_12580080
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Digy commented on LUCENENET-111:
--------------------------------
http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc//org/apache/lucene/search/Similarity.html
DIGY
> lucene score formula
> --------------------
>
> Key: LUCENENET-111
> URL: https://issues.apache.org/jira/browse/LUCENENET-111
> Project: Lucene.Net
> Issue Type: Bug
> Environment: ASP.NET C#
> Reporter: immanouel
>
> I´m working with lucene. net in C# and i, being quite confuse, have a
> question :
> First of all i created an IndexWriter code to insert text on lucene, then
> an indexsearcher ...
> here´s the index write code:
> /........................................................................................................
> IndexWriter writer = new IndexWriter(sIndexPath, new
> StandardAnalyzer(), false);
> Document doc = new Document();
> doc.Add(new Field("title", sHeader, Field.Store.YES,
> Field.Index.UN_TOKENIZED));
> doc.Add(new Field("link", sType, Field.Store.YES,
> Field.Index.UN_TOKENIZED));
> doc.Add(new Field("content", sContent, Field.Store.YES,
> Field.Index.TOKENIZED));
> writer.AddDocument(doc);
> writer.Optimize();
> writer.Close();
> /......................................................................................................
> here´s the IndexSearcher code:
> (As you can see there´s an - explanation - code output)
> //....................................................................................................................................
> IndexSearcher searcher = new IndexSearcher(IndexLocation());
> QueryParser oParser = new QueryParser("content", new
> StandardAnalyzer());
> string sSearchQuery = TextBox1.Text;
> Hits oHitColl = searcher.Search(oParser.Parse(sSearchQuery));
> for (int i = 0; i < oHitColl.Length(); i++)
> {
>
> Explanation explanation = searcher.Explain(query,
> oHitColl.Id(i));//generate explanation of single document for query
> // Document oDoc = oHitColl.Doc(i);
> string conteudo = oDoc.Get("content");
> if (conteudo != null)
> {
> Label1.Text = Label1.Text + explanation.ToString() +
> "<br>";//output explanation
> Label2.Text = Label2.Text + "</p>-------------<br>";
> }
> //.............................As you can see the code is nothing
> special..............................................
> Everything went well, except that i don´t understand something in the
> output... :
> 1,356585 = fieldWeight(content:açores in 448), product of: 1 =
> tf(termFreq(content:açores)=1) 2,713169 = idf(docFreq=85) 0,5 =
> fieldNorm(field=content, doc=448)
> ----------
> 0,4239327 = fieldWeight(content:açores in 253), product of: 2 =
> tf(termFreq(content:açores)=4) 2,713169 = idf(docFreq=85) 0,078125 =
> fieldNorm(field=content, doc=253)
> ----------
> 0,4153675 = fieldWeight(content:açores in 125), product of: 2,44949 =
> tf(termFreq(content:açores)=6) 2,713169 = idf(docFreq=85) 0,0625 =
> fieldNorm(field=content, doc=125)
> ----------
> 0,3791769 = fieldWeight(content:açores in 210), product of: 2,236068 =
> tf(termFreq(content:açores)=5) 2,713169 = idf(docFreq=85) 0,0625 =
> fieldNorm(field=content, doc=210)
> ----------
> 0,3671364 = fieldWeight(content:açores in 259), product of: 1,732051 =
> tf(termFreq(content:açores)=3) 2,713169 = idf(docFreq=85) 0,078125 =
> fieldNorm(field=content, doc=259)
> ----------
> 0,3634466 = fieldWeight(content:açores in 95), product of: 2,44949 =
> tf(termFreq(content:açores)=6) 2,713169 = idf(docFreq=85) 0,0546875 =
> fieldNorm(field=content, doc=95)
> etc..
> So here goes the question:
> shouldn´t the output order be based on the termFreq ?? how come termfrequecy
> = 1 be in the top order list?
> Shouldn´t the (termFreq(content:açores)=1) be the last (on the list) and
> (termFreq(content:açores)=6) at top (of the list)?
> Am i doing something wrong? Is there something about lucene score formula
> that i should know?
> Thanks!
> PS - Please response!!
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