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<article class="content wrap" id="_content" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis">
<h1 id="Lucene_Net_Queries_Mlt_MoreLikeThis" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis" class="text-break">Class MoreLikeThis
</h1>
<div class="markdown level0 summary"><p>Generate &quot;more like this&quot; similarity queries.
Based on this mail:</p>
<pre><code>Lucene does let you access the document frequency of terms, with <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DocFreq_Lucene_Net_Index_Term_">DocFreq(Term)</a>.
Term frequencies can be computed by re-tokenizing the text, which, for a single document,
is usually fast enough. But looking up the <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DocFreq_Lucene_Net_Index_Term_">DocFreq(Term)</a> of every term in the document is
probably too slow.
<p>
You can use some heuristics to prune the set of terms, to avoid calling <a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DocFreq_Lucene_Net_Index_Term_">DocFreq(Term)</a> too much,
or at all. Since you&apos;re trying to maximize a tf*idf score, you&apos;re probably most interested
in terms with a high tf. Choosing a tf threshold even as low as two or three will radically
reduce the number of terms under consideration. Another heuristic is that terms with a
high idf (i.e., a low df) tend to be longer. So you could threshold the terms by the
number of characters, not selecting anything less than, e.g., six or seven characters.
With these sorts of heuristics you can usually find small set of, e.g., ten or fewer terms
that do a pretty good job of characterizing a document.
<p>
It all depends on what you&apos;re trying to do. If you&apos;re trying to eek out that last percent
of precision and recall regardless of computational difficulty so that you can win a TREC
competition, then the techniques I mention above are useless. But if you&apos;re trying to
provide a &quot;more like this&quot; button on a search results page that does a decent job and has
good performance, such techniques might be useful.
<p>
An efficient, effective &quot;more-like-this&quot; query generator would be a great contribution, if
anyone&apos;s interested. I&apos;d imagine that it would take a Reader or a String (the document&apos;s
text), analyzer Analyzer, and return a set of representative terms using heuristics like those
above. The frequency and length thresholds could be parameters, etc.
<p>
Doug</code></pre>
<p><p>
<p>
<p>
<strong>Initial Usage</strong>
<p>
This class has lots of options to try to make it efficient and flexible.
The simplest possible usage is as follows. The bold
fragment is specific to this class.
<p>
<pre><code>IndexReader ir = ...
IndexSearcher is = ...
MoreLikeThis mlt = new MoreLikeThis(ir);
TextReader target = ... // orig source of doc you want to find similarities to
Query query = mlt.Like(target);
Hits hits = is.Search(query);
// now the usual iteration thru &apos;hits&apos; - the only thing to watch for is to make sure
//you ignore the doc if it matches your &apos;target&apos; document, as it should be similar to itself</code></pre>
<p><p>
Thus you:
<ul><li>do your normal, Lucene setup for searching,</li><li>create a MoreLikeThis,</li><li>get the text of the doc you want to find similarities to</li><li>then call one of the <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_Like_System_IO_TextReader_System_String_">Like(TextReader, String)</a> calls to generate a similarity query</li><li>call the searcher to find the similar docs</li></ul>
<p>
<strong>More Advanced Usage</strong>
<p>
You may want to use the setter for <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_FieldNames">FieldNames</a> so you can examine
multiple fields (e.g. body and title) for similarity.
<p>
<p>
Depending on the size of your index and the size and makeup of your documents you
may want to call the other set methods to control how the similarity queries are
generated:
<ul><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MinTermFreq">MinTermFreq</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MinDocFreq">MinDocFreq</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxDocFreq">MaxDocFreq</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_SetMaxDocFreqPct_System_Int32_">SetMaxDocFreqPct(Int32)</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MinWordLen">MinWordLen</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxWordLen">MaxWordLen</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxQueryTerms">MaxQueryTerms</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxNumTokensParsed">MaxNumTokensParsed</a></li><li><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_StopWords">StopWords</a></li></ul></p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><span class="xref">MoreLikeThis</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">System.Object.Equals(System.Object)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetHashCode()</span>
</div>
<div>
<span class="xref">System.Object.GetType()</span>
</div>
<div>
<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.ToString()</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Queries.Mlt.html">Lucene.Net.Queries.Mlt</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Queries.dll</h6>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public sealed class MoreLikeThis</code></pre>
</div>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_remarks"><strong>Remarks</strong></h5>
<div class="markdown level0 remarks"><p>Changes: Mark Harwood 29/02/04
Some bugfixing, some refactoring, some optimisation.</p>
<ul>
<li>bugfix: retrieveTerms(int docNum) was not working for indexes without a termvector -added missing code</li>
<li>bugfix: No significant terms being created for fields with a termvector - because
was only counting one occurrence per term/field pair in calculations(ie not including frequency info from TermVector)</li>
<li>refactor: moved common code into isNoiseWord()</li>
<li>optimise: when no termvector support available - used maxNumTermsParsed to limit amount of tokenization</li>
</ul>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis__ctor_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.#ctor*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis__ctor_Lucene_Net_Index_IndexReader_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.#ctor(Lucene.Net.Index.IndexReader)">MoreLikeThis(IndexReader)</h4>
<div class="markdown level1 summary"><p>Constructor requiring an <span class="xref">Lucene.Net.Index.IndexReader</span>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public MoreLikeThis(IndexReader ir)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Index.IndexReader</span></td>
<td><span class="parametername">ir</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis__ctor_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.#ctor*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis__ctor_Lucene_Net_Index_IndexReader_Lucene_Net_Search_Similarities_TFIDFSimilarity_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.#ctor(Lucene.Net.Index.IndexReader,Lucene.Net.Search.Similarities.TFIDFSimilarity)">MoreLikeThis(IndexReader, TFIDFSimilarity)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public MoreLikeThis(IndexReader ir, TFIDFSimilarity sim)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Index.IndexReader</span></td>
<td><span class="parametername">ir</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Search.Similarities.TFIDFSimilarity</span></td>
<td><span class="parametername">sim</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="fields">Fields
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_BOOST.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_BOOST%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_BOOST" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_BOOST">DEFAULT_BOOST</h4>
<div class="markdown level1 summary"><p>Boost terms in query based on score.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly bool DEFAULT_BOOST</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_BOOST_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_ApplyBoost">ApplyBoost</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_FIELD_NAMES" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_FIELD_NAMES">DEFAULT_FIELD_NAMES</h4>
<div class="markdown level1 summary"><p>Default field names. Null is used to specify that the field names should be looked
up at runtime from the provided reader.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly string[] DEFAULT_FIELD_NAMES</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span>[]</td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_DOC_FREQ" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_MAX_DOC_FREQ">DEFAULT_MAX_DOC_FREQ</h4>
<div class="markdown level1 summary"><p>Ignore words which occur in more than this many docs.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly int DEFAULT_MAX_DOC_FREQ</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_DOC_FREQ_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxDocFreq">MaxDocFreq</a></div>
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_SetMaxDocFreqPct_System_Int32_">SetMaxDocFreqPct(Int32)</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_NUM_TOKENS_PARSED" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_MAX_NUM_TOKENS_PARSED">DEFAULT_MAX_NUM_TOKENS_PARSED</h4>
<div class="markdown level1 summary"><p>Default maximum number of tokens to parse in each example doc field that is not stored with TermVector support.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly int DEFAULT_MAX_NUM_TOKENS_PARSED</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_NUM_TOKENS_PARSED_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxNumTokensParsed">MaxNumTokensParsed</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_QUERY_TERMS" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_MAX_QUERY_TERMS">DEFAULT_MAX_QUERY_TERMS</h4>
<div class="markdown level1 summary"><p>Return a Query with no more than this many terms.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly int DEFAULT_MAX_QUERY_TERMS</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_QUERY_TERMS_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Search.BooleanQuery.html#Lucene_Net_Search_BooleanQuery_MaxClauseCount">MaxClauseCount</a></div>
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxQueryTerms">MaxQueryTerms</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_WORD_LENGTH" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_MAX_WORD_LENGTH">DEFAULT_MAX_WORD_LENGTH</h4>
<div class="markdown level1 summary"><p>Ignore words greater than this length or if 0 then this has no effect.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly int DEFAULT_MAX_WORD_LENGTH</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_WORD_LENGTH_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxWordLen">MaxWordLen</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_DOC_FREQ" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_MIN_DOC_FREQ">DEFAULT_MIN_DOC_FREQ</h4>
<div class="markdown level1 summary"><p>Ignore words which do not occur in at least this many docs.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly int DEFAULT_MIN_DOC_FREQ</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_DOC_FREQ_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MinDocFreq">MinDocFreq</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_TERM_FREQ" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_MIN_TERM_FREQ">DEFAULT_MIN_TERM_FREQ</h4>
<div class="markdown level1 summary"><p>Ignore terms with less than this frequency in the source doc.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly int DEFAULT_MIN_TERM_FREQ</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_TERM_FREQ_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MinTermFreq">MinTermFreq</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_WORD_LENGTH" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_MIN_WORD_LENGTH">DEFAULT_MIN_WORD_LENGTH</h4>
<div class="markdown level1 summary"><p>Ignore words less than this length or if 0 then this has no effect.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly int DEFAULT_MIN_WORD_LENGTH</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_WORD_LENGTH_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MinWordLen">MinWordLen</a></div>
</div>
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</span>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_STOP_WORDS" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DEFAULT_STOP_WORDS">DEFAULT_STOP_WORDS</h4>
<div class="markdown level1 summary"><p>Default set of stopwords.
If null means to allow stop words.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static readonly ISet&lt;string&gt; DEFAULT_STOP_WORDS</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Collections.Generic.ISet</span>&lt;<span class="xref">System.String</span>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_STOP_WORDS_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_StopWords">StopWords</a></div>
</div>
<h3 id="properties">Properties
</h3>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_Analyzer.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.Analyzer%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_Analyzer_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Analyzer*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_Analyzer" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Analyzer">Analyzer</h4>
<div class="markdown level1 summary"><p>Gets or Sets an analyzer that will be used to parse source doc with. The default analyzer
is not set. An analyzer is not required for generating a query with the
<a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_Like_System_Int32_">Like(Int32)</a> method, all other &apos;like&apos; methods require an analyzer.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public Analyzer Analyzer { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Analysis.Analyzer</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_ApplyBoost_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.ApplyBoost*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_ApplyBoost" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.ApplyBoost">ApplyBoost</h4>
<div class="markdown level1 summary"><p>Gets or Sets whether to boost terms in query based on &quot;score&quot; or not. The default is
<a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_BOOST">DEFAULT_BOOST</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public bool ApplyBoost { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_BoostFactor_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.BoostFactor*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_BoostFactor" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.BoostFactor">BoostFactor</h4>
<div class="markdown level1 summary"><p>Gets or Sets the boost factor used when boosting terms</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public float BoostFactor { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_FieldNames_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.FieldNames*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_FieldNames" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.FieldNames">FieldNames</h4>
<div class="markdown level1 summary"><p>Gets or Sets the field names that will be used when generating the &apos;More Like This&apos; query.
The default field names that will be used is <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_FIELD_NAMES">DEFAULT_FIELD_NAMES</a>.
Set this to null for the field names to be determined at runtime from the <span class="xref">Lucene.Net.Index.IndexReader</span>
provided in the constructor.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public string[] FieldNames { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span>[]</td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxDocFreq_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxDocFreq*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxDocFreq" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxDocFreq">MaxDocFreq</h4>
<div class="markdown level1 summary"><p>Gets or Sets the maximum frequency in which words may still appear.
Words that appear in more than this many docs will be ignored. The default frequency is
<a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_DOC_FREQ">DEFAULT_MAX_DOC_FREQ</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int MaxDocFreq { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxNumTokensParsed_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxNumTokensParsed*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxNumTokensParsed" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxNumTokensParsed">MaxNumTokensParsed</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int MaxNumTokensParsed { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><p>Gets or Sets the maximum number of tokens to parse in each example doc field that is not stored with TermVector support </p>
</td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxNumTokensParsed_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_NUM_TOKENS_PARSED">DEFAULT_MAX_NUM_TOKENS_PARSED</a></div>
</div>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_MaxQueryTerms.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.MaxQueryTerms%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxQueryTerms_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxQueryTerms*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxQueryTerms" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxQueryTerms">MaxQueryTerms</h4>
<div class="markdown level1 summary"><p>Gets or Sets the maximum number of query terms that will be included in any generated query.
The default is <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_QUERY_TERMS">DEFAULT_MAX_QUERY_TERMS</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int MaxQueryTerms { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxWordLen_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxWordLen*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MaxWordLen" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MaxWordLen">MaxWordLen</h4>
<div class="markdown level1 summary"><p>Gets or Sets the maximum word length above which words will be ignored. Set this to 0 for no
maximum word length. The default is <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MAX_WORD_LENGTH">DEFAULT_MAX_WORD_LENGTH</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int MaxWordLen { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_MinDocFreq.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.MinDocFreq%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_MinDocFreq_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MinDocFreq*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MinDocFreq" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MinDocFreq">MinDocFreq</h4>
<div class="markdown level1 summary"><p>Gets or Sets the frequency at which words will be ignored which do not occur in at least this
many docs. The default frequency is <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_DOC_FREQ">DEFAULT_MIN_DOC_FREQ</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int MinDocFreq { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_MinTermFreq.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.MinTermFreq%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_MinTermFreq_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MinTermFreq*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MinTermFreq" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MinTermFreq">MinTermFreq</h4>
<div class="markdown level1 summary"><p>Gets or Sets the frequency below which terms will be ignored in the source doc. The default
frequency is the <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_TERM_FREQ">DEFAULT_MIN_TERM_FREQ</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int MinTermFreq { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_MinWordLen_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MinWordLen*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_MinWordLen" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.MinWordLen">MinWordLen</h4>
<div class="markdown level1 summary"><p>Gets or Sets the minimum word length below which words will be ignored. Set this to 0 for no
minimum word length. The default is <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_DEFAULT_MIN_WORD_LENGTH">DEFAULT_MIN_WORD_LENGTH</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public int MinWordLen { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_Similarity.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.Similarity%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_Similarity_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Similarity*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_Similarity" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Similarity">Similarity</h4>
<div class="markdown level1 summary"><p>For idf() calculations.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public TFIDFSimilarity Similarity { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Similarities.TFIDFSimilarity</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_StopWords.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.StopWords%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_StopWords_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.StopWords*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_StopWords" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.StopWords">StopWords</h4>
<div class="markdown level1 summary"><p>Gets or Sets the set of stopwords.
Any word in this set is considered &quot;uninteresting&quot; and ignored.
Even if your <span class="xref">Lucene.Net.Analysis.Analyzer</span> allows stopwords, you might want to tell the <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html">MoreLikeThis</a> code to ignore them, as
for the purposes of document similarity it seems reasonable to assume that &quot;a stop word is never interesting&quot;.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public ISet&lt;string&gt; StopWords { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Collections.Generic.ISet</span>&lt;<span class="xref">System.String</span>&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_DescribeParams.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.DescribeParams%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_DescribeParams_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DescribeParams*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_DescribeParams" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.DescribeParams">DescribeParams()</h4>
<div class="markdown level1 summary"><p>Describe the parameters that control how the &quot;more like this&quot; query is formed.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public string DescribeParams()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00010/websites/apidocs/apiSpec/new?filename=Lucene_Net_Queries_Mlt_MoreLikeThis_Like_System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Queries.Mlt.MoreLikeThis.Like(System.Int32)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_Like_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Like*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_Like_System_Int32_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Like(System.Int32)">Like(Int32)</h4>
<div class="markdown level1 summary"><p>Return a query that will return docs like the passed lucene document ID.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public Query Like(int docNum)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">docNum</span></td>
<td><p>the documentID of the lucene doc to generate the &apos;More Like This&quot; query for. </p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><p>a query that will return docs like the passed lucene document ID. </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_Like_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Like*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_Like_System_IO_TextReader_System_String_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.Like(System.IO.TextReader,System.String)">Like(TextReader, String)</h4>
<div class="markdown level1 summary"><p>Return a query that will return docs like the passed <span class="xref">System.IO.TextReader</span>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public Query Like(TextReader r, string fieldName)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.TextReader</span></td>
<td><span class="parametername">r</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">fieldName</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Search.Query</span></td>
<td><p>a query that will return docs like the passed <span class="xref">System.IO.TextReader</span>. </p>
</td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveInterestingTerms*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_System_Int32_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveInterestingTerms(System.Int32)">RetrieveInterestingTerms(Int32)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public string[] RetrieveInterestingTerms(int docNum)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">docNum</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span>[]</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_System_Int32__seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_System_IO_TextReader_System_String_">RetrieveInterestingTerms(TextReader, String)</a></div>
</div>
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</span>
<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveInterestingTerms*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_System_IO_TextReader_System_String_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveInterestingTerms(System.IO.TextReader,System.String)">RetrieveInterestingTerms(TextReader, String)</h4>
<div class="markdown level1 summary"><p>Convenience routine to make it easy to return the most interesting words in a document.
More advanced users will call <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveTerms_System_IO_TextReader_System_String_">RetrieveTerms(TextReader, String)</a> directly.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public string[] RetrieveInterestingTerms(TextReader r, string fieldName)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.TextReader</span></td>
<td><span class="parametername">r</span></td>
<td><p>the source document </p>
</td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">fieldName</span></td>
<td><p>field passed to analyzer to use when analyzing the content </p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span>[]</td>
<td><p>the most interesting words in the document </p>
</td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_System_IO_TextReader_System_String__seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveTerms_System_IO_TextReader_System_String_">RetrieveTerms(TextReader, String)</a></div>
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_MaxQueryTerms">MaxQueryTerms</a></div>
</div>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveTerms_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveTerms*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveTerms_System_Int32_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveTerms(System.Int32)">RetrieveTerms(Int32)</h4>
<div class="markdown level1 summary"><p>Find words for a more-like-this query former.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public PriorityQueue&lt;object[]&gt; RetrieveTerms(int docNum)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">docNum</span></td>
<td><p>the id of the lucene document from which to find terms </p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Util.PriorityQueue</span>&lt;<span class="xref">System.Object</span>[]&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="exceptions">Exceptions</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Condition</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.IOException</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveTerms_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveTerms*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveTerms_System_IO_TextReader_System_String_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.RetrieveTerms(System.IO.TextReader,System.String)">RetrieveTerms(TextReader, String)</h4>
<div class="markdown level1 summary"><p>Find words for a more-like-this query former.
The result is a priority queue of arrays with one entry for <strong>every word</strong> in the document.
Each array has 6 elements.
The elements are:
<ul><li>The word (<span class="xref">System.String</span>)</li><li>The top field that this word comes from (<span class="xref">System.String</span>)</li><li>The score for this word (<span class="xref">System.Single</span>)</li><li>The IDF value (<span class="xref">System.Single</span>)</li><li>The frequency of this word in the index (<span class="xref">System.Int32</span>)</li><li>The frequency of this word in the source document (<span class="xref">System.Int32</span>)</li></ul>
This is a somewhat &quot;advanced&quot; routine, and in general only the 1st entry in the array is of interest.
This method is exposed so that you can identify the &quot;interesting words&quot; in a document.
For an easier method to call see <a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_System_IO_TextReader_System_String_">RetrieveInterestingTerms(TextReader, String)</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public PriorityQueue&lt;object[]&gt; RetrieveTerms(TextReader r, string fieldName)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.TextReader</span></td>
<td><span class="parametername">r</span></td>
<td><p>the reader that has the content of the document </p>
</td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">fieldName</span></td>
<td><p>field passed to the analyzer to use when analyzing the content </p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Util.PriorityQueue</span>&lt;<span class="xref">System.Object</span>[]&gt;</td>
<td><p>the most interesting words in the document ordered by score, with the highest scoring, or best entry, first </p>
</td>
</tr>
</tbody>
</table>
<h5 class="exceptions">Exceptions</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Condition</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.IOException</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveTerms_System_IO_TextReader_System_String__seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Queries.Mlt.MoreLikeThis.html#Lucene_Net_Queries_Mlt_MoreLikeThis_RetrieveInterestingTerms_System_IO_TextReader_System_String_">RetrieveInterestingTerms(TextReader, String)</a></div>
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<a id="Lucene_Net_Queries_Mlt_MoreLikeThis_SetMaxDocFreqPct_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.SetMaxDocFreqPct*"></a>
<h4 id="Lucene_Net_Queries_Mlt_MoreLikeThis_SetMaxDocFreqPct_System_Int32_" data-uid="Lucene.Net.Queries.Mlt.MoreLikeThis.SetMaxDocFreqPct(System.Int32)">SetMaxDocFreqPct(Int32)</h4>
<div class="markdown level1 summary"><p>Set the maximum percentage in which words may still appear. Words that appear
in more than this many percent of all docs will be ignored.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public void SetMaxDocFreqPct(int maxPercentage)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">maxPercentage</span></td>
<td><p>the maximum percentage of documents (0-100) that a term may appear
in to be still considered relevant </p>
</td>
</tr>
</tbody>
</table>
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