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href="685571bd-e7ad-c241-6ec0-418010782d42.htm">DefaultSimilarity Class</a> <a href="#seeAlsoToggle" onclick="OpenSection(seeAlsoToggle)">See Also</a> <span id="headfeedbackarea" class="feedbackhead"><a href="javascript:SubmitFeedback('','Lucene.Net Class Libraries','','','','%0\dYour%20feedback%20is%20used%20to%20improve%20the%20documentation%20and%20the%20product.%20Your%20e-mail%20address%20will%20not%20be%20used%20for%20any%20other%20purpose%20and%20is%20disposed%20of%20after%20the%20issue%20you%20report%20is%20resolved.%20%20While%20working%20to%20resolve%20the%20issue%20that%20you%20report,%20you%20may%20be%20contacted%20via%20e-mail%20to%20get%20further%20details%20or%20clarification%20on%20the%20feedback%20you%20sent.%20After%20the%20issue%20you%20report%20has%20been%20addressed,%20you%20may%20receive%20an%20e-mail%20to%20let%20you%20know%20that%20your%20feedback%20has%20been%20addressed.%0\A%0\d','Customer%20Feedback');">Send Feedback</a></span></td></tr></table><table id="gradientTable"><tr><td class="nsrBottom" background="../icons/gradient.gif" /></tr></table></div><div id="mainSection"><div id="mainBody"><div id="allHistory" class="saveHistory" onsave="saveAll()" onload="loadAll()" /><span style="color: DarkGray"></span><p>The <a href="685571bd-e7ad-c241-6ec0-418010782d42.htm">DefaultSimilarity</a> type exposes the following members.</p><h1 class="heading"><span onclick="ExpandCollapse(methodTableToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(methodTableToggle, event)" tabindex="0"><img id="methodTableToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Methods</span></h1><div id="methodTableSection" class="section" name="collapseableSection" style=""><table id="memberList" class="members" frame="lhs" cellpadding="2"><col width="10%" /><tr><th class="iconColumn">
 
</th><th class="nameColumn">Name</th><th class="descriptionColumn">Description</th></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="c18ddc6e-6c9a-cfe0-bc28-85941426e73d.htm">ComputeNorm</a></td><td><div class="summary">Implemented as
<span id="cbc_1" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">state.getBoost()*lengthNorm(numTerms)</pre></div></span>, where
<span id="cbc_2" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">numTerms</pre></div></span> is {@link FieldInvertState#GetLength()} if {@link
#setDiscountOverlaps} is false, else it's {@link
FieldInvertState#GetLength()} - {@link
FieldInvertState#GetNumOverlap()}.
<p /><b>WARNING</b>: This API is new and experimental, and may suddenly
change.<p /></div> (Overrides <a href="14300f11-cbe3-7d6e-4e98-3912270d4980.htm">Similarity<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>ComputeNorm(String, FieldInvertState)</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="031ef32b-cff3-a03a-72ab-7b78b752b680.htm">Coord</a></td><td><div class="summary">Implemented as <span id="cbc_3" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">overlap / maxOverlap</pre></div></span>. </div> (Overrides <a href="b9e2973a-6945-72aa-4299-da7acb7e0268.htm">Similarity<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>Coord(Int32, Int32)</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="http://msdn2.microsoft.com/en-us/library/bsc2ak47" target="_blank">Equals</a></td><td><div class="summary">Determines whether the specified <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a> is equal to the current <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.</div> (Inherited from <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.)</td></tr><tr data="protected;inherited;notNetfw;"><td><img src="../icons/protmethod.gif" alt="Protected method" title="Protected method" /></td><td><a href="http://msdn2.microsoft.com/en-us/library/4k87zsw7" target="_blank">Finalize</a></td><td><div class="summary">Allows an <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a> to attempt to free resources and perform other cleanup operations before the <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a> is reclaimed by garbage collection.</div> (Inherited from <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="38e8332e-5371-bb7c-219b-ab76efb99acf.htm">GetDiscountOverlaps</a></td><td /></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="http://msdn2.microsoft.com/en-us/library/zdee4b3y" target="_blank">GetHashCode</a></td><td><div class="summary">Serves as a hash function for a particular type. </div> (Inherited from <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="http://msdn2.microsoft.com/en-us/library/dfwy45w9" target="_blank">GetType</a></td><td><div class="summary">Gets the <a href="http://msdn2.microsoft.com/en-us/library/42892f65" target="_blank">Type</a> of the current instance.</div> (Inherited from <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="6967f467-9447-eb40-f97c-f2b20f43641c.htm">Idf(Int32, Int32)</a></td><td><div class="summary">Implemented as <span id="cbc_4" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">log(numDocs/(docFreq<span class="highlight-number">+1</span>)) + <span class="highlight-number">1</span></pre></div></span>. </div> (Overrides <a href="410fa404-3495-ce90-175b-cee704aad82e.htm">Similarity<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>Idf(Int32, Int32)</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="ba20a748-0bb9-ed5b-58b7-bd367a6d0203.htm">Idf(ICollection, Searcher)</a></td><td> <font color="red"><b>Obsolete. </b></font><div class="summary">Computes a score factor for a phrase.
<p />The default implementation sums the {@link #Idf(Term,Searcher)} factor
for each term in the phrase.
</div> (Inherited from <a href="cf113347-e96f-3c18-5b30-ccddb57ae08c.htm">Similarity</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="2ad62284-f5f4-afff-8353-4d04dbf9cb74.htm">Idf(Term, Searcher)</a></td><td> <font color="red"><b>Obsolete. </b></font><div class="summary">Computes a score factor for a simple term.
<p />The default implementation is:<pre>
return idf(searcher.docFreq(term), searcher.maxDoc());
</pre>
Note that {@link Searcher#MaxDoc()} is used instead of
{@link Lucene.Net.Index.IndexReader#NumDocs()} because it is proportional to
{@link Searcher#DocFreq(Term)} , i.e., when one is inaccurate,
so is the other, and in the same direction.
</div> (Inherited from <a href="cf113347-e96f-3c18-5b30-ccddb57ae08c.htm">Similarity</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="ff1f84ef-1a3d-a63c-5810-c56677132d3c.htm">idfExplain</a></td><td><div class="summary"> Computes a score factor for a phrase.
<p />
The default implementation sums the idf factor for
each term in the phrase.
</div> (Inherited from <a href="cf113347-e96f-3c18-5b30-ccddb57ae08c.htm">Similarity</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="e7e3a1c1-4b94-5051-5fdb-e04456fa115c.htm">IdfExplain</a></td><td><div class="summary"> Computes a score factor for a simple term and returns an explanation
for that score factor.
<p />
The default implementation uses:
<pre>
idf(searcher.docFreq(term), searcher.maxDoc());
</pre>
Note that {@link Searcher#MaxDoc()} is used instead of
{@link Lucene.Net.Index.IndexReader#NumDocs()} because it is
proportional to {@link Searcher#DocFreq(Term)} , i.e., when one is
inaccurate, so is the other, and in the same direction.
</div> (Inherited from <a href="cf113347-e96f-3c18-5b30-ccddb57ae08c.htm">Similarity</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="e7db44b1-4737-6700-a175-a4858cb03949.htm">LengthNorm</a></td><td><div class="summary">Implemented as <span id="cbc_5" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve"><span class="highlight-number">1</span>/sqrt(numTerms)</pre></div></span>. </div> (Overrides <a href="0aaa8507-9e42-a027-1cba-8a5d7d16aeae.htm">Similarity<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>LengthNorm(String, Int32)</a>.)</td></tr><tr data="protected;inherited;notNetfw;"><td><img src="../icons/protmethod.gif" alt="Protected method" title="Protected method" /></td><td><a href="http://msdn2.microsoft.com/en-us/library/57ctke0a" target="_blank">MemberwiseClone</a></td><td><div class="summary">Creates a shallow copy of the current <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.</div> (Inherited from <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="8b6b2bbc-e7bf-8121-003c-5d069021b02e.htm">QueryNorm</a></td><td><div class="summary">Implemented as <span id="cbc_6" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve"><span class="highlight-number">1</span>/sqrt(sumOfSquaredWeights)</pre></div></span>. </div> (Overrides <a href="61ea96d6-3abc-d096-3f63-07cd30c927c6.htm">Similarity<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>QueryNorm(Single)</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="b6002056-4139-a968-b325-bb29c383ea82.htm">ScorePayload(String, <span class="languageSpecificText"><span class="cpp">array&lt;</span></span>Byte<span class="languageSpecificText"><span class="cpp">&gt;</span><span class="cs">[]</span><span class="vb">()</span><span class="nu">[]</span><span class="fs">[]</span></span>, Int32, Int32)</a></td><td> <font color="red"><b>Obsolete. </b></font><div class="summary"> Calculate a scoring factor based on the data in the payload. Overriding implementations
are responsible for interpreting what is in the payload. Lucene makes no assumptions about
what is in the byte array.
<p />
The default implementation returns 1.
</div> (Inherited from <a href="cf113347-e96f-3c18-5b30-ccddb57ae08c.htm">Similarity</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="3ac980f7-36b0-f727-a40e-ec47da182d01.htm">ScorePayload(Int32, String, Int32, Int32, <span class="languageSpecificText"><span class="cpp">array&lt;</span></span>Byte<span class="languageSpecificText"><span class="cpp">&gt;</span><span class="cs">[]</span><span class="vb">()</span><span class="nu">[]</span><span class="fs">[]</span></span>, Int32, Int32)</a></td><td><div class="summary"> Calculate a scoring factor based on the data in the payload. Overriding implementations
are responsible for interpreting what is in the payload. Lucene makes no assumptions about
what is in the byte array.
<p />
The default implementation returns 1.
</div> (Inherited from <a href="cf113347-e96f-3c18-5b30-ccddb57ae08c.htm">Similarity</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="d5beec0c-1569-1a87-32de-e1846e6a60ab.htm">SetDiscountOverlaps</a></td><td><div class="summary">Determines whether overlap tokens (Tokens with
0 position increment) are ignored when computing
norm. By default this is false, meaning overlap
tokens are counted just like non-overlap tokens.
<p /><b>WARNING</b>: This API is new and experimental, and may suddenly
change.<p /></div></td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="1583f293-a740-fad2-1574-a9982f293d7d.htm">SloppyFreq</a></td><td><div class="summary">Implemented as <span id="cbc_7" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve"><span class="highlight-number">1</span> / (distance + <span class="highlight-number">1</span>)</pre></div></span>. </div> (Overrides <a href="bb6f6d1d-b92b-19f7-aac3-275540d6ced2.htm">Similarity<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>SloppyFreq(Int32)</a>.)</td></tr><tr data="public;declared;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="4e12f9bc-05c7-09b3-111c-7fe6adde9988.htm">Tf(Single)</a></td><td><div class="summary">Implemented as <span id="cbc_8" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">sqrt(freq)</pre></div></span>. </div> (Overrides <a href="6ea1125d-8619-2953-2699-639a4f33907d.htm">Similarity<span class="languageSpecificText"><span class="cs">.</span><span class="vb">.</span><span class="cpp">::</span><span class="nu">.</span><span class="fs">.</span></span>Tf(Single)</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="db5197ea-6d7f-a6cf-0bae-b95b2e5dfff5.htm">Tf(Int32)</a></td><td><div class="summary">Computes a score factor based on a term or phrase's frequency in a
document. This value is multiplied by the {@link #Idf(Term, Searcher)}
factor for each term in the query and these products are then summed to
form the initial score for a document.
<p />Terms and phrases repeated in a document indicate the topic of the
document, so implementations of this method usually return larger values
when <span id="cbc_9" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">freq</pre></div></span> is large, and smaller values when <span id="cbc_10" x-lang="CSharp" codeLanguage="CSharp"><div class="highlight-title"><span class="highlight-copycode" onkeypress="javascript:CopyColorizedCodeCheckKey(this.parentNode, event);" tabindex="0" onmouseover="CopyCodeChangeIcon(this)" onmouseout="CopyCodeChangeIcon(this)" onclick="javascript:CopyColorizedCode(this.parentNode);"><img style="margin-right: 5px;" src="../icons/CopyCode.gif" />Copy</span>C#</div><div class="code"><pre xml:space="preserve">freq</pre></div></span>
is small.
<p />The default implementation calls {@link #Tf(float)}.
</div> (Inherited from <a href="cf113347-e96f-3c18-5b30-ccddb57ae08c.htm">Similarity</a>.)</td></tr><tr data="public;inherited;notNetfw;"><td><img src="../icons/pubmethod.gif" alt="Public method" title="Public method" /></td><td><a href="http://msdn2.microsoft.com/en-us/library/7bxwbwt2" target="_blank">ToString</a></td><td><div class="summary">Returns a <a href="http://msdn2.microsoft.com/en-us/library/s1wwdcbf" target="_blank">String</a> that represents the current <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.</div> (Inherited from <a href="http://msdn2.microsoft.com/en-us/library/e5kfa45b" target="_blank">Object</a>.)</td></tr></table></div><h1 class="heading"><span onclick="ExpandCollapse(seeAlsoToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(seeAlsoToggle, event)" tabindex="0"><img id="seeAlsoToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />See Also</span></h1><div id="seeAlsoSection" class="section" name="collapseableSection" style=""><div class="seeAlsoStyle"><a href="685571bd-e7ad-c241-6ec0-418010782d42.htm">DefaultSimilarity Class</a></div><div class="seeAlsoStyle"><a href="5715bafd-c3a8-9ed0-225c-3c4cececbdc0.htm">Lucene.Net.Search Namespace</a></div></div></div><div id="footer"><div class="footerLine"><img width="100%" height="3px" src="../icons/footer.gif" alt="Footer image" title="Footer image" /></div><A NAME="feedback"></A><span id="fb" class="feedbackcss"></span></div></div></body></html>