<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >IDFFactor</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="mnoGoSearch 3.3.9 reference manual" HREF="index.html"><LINK REL="UP" TITLE="mnoGoSearch command reference" HREF="msearch-cmdref.html"><LINK REL="PREVIOUS" TITLE="HTTPHeader" HREF="msearch-cmdref-httpheader.html"><LINK REL="NEXT" TITLE="ImportEnv" HREF="msearch-cmdref-importenv.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="mnogo.css"><META NAME="Description" CONTENT="mnoGoSearch - Full Featured Web site Open Source Search Engine Software over the Internet and Intranet Web Sites Based on SQL Database. It is a Free search software covered by GNU license."><META NAME="Keywords" CONTENT="shareware, freeware, download, internet, unix, utilities, search engine, text retrieval, knowledge retrieval, text search, information retrieval, database search, mining, intranet, webserver, index, spider, filesearch, meta, free, open source, full-text, udmsearch, website, find, opensource, search, searching, software, udmsearch, engine, indexing, system, web, ftp, http, cgi, php, SQL, MySQL, database, php3, FreeBSD, Linux, Unix, mnoGoSearch, MacOS X, Mac OS X, Windows, 2000, NT, 95, 98, GNU, GPL, url, grabbing"></HEAD ><BODY CLASS="refentry" BGCOLOR="#EEEEEE" TEXT="#000000" LINK="#000080" VLINK="#800080" ALINK="#FF0000" ><!--#include virtual="body-before.html"--><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" ><SPAN CLASS="application" >mnoGoSearch</SPAN > 3.3.9 reference manual: Full-featured search engine software</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="msearch-cmdref-httpheader.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="msearch-cmdref-importenv.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="cmdref-idffactor" ></A >IDFFactor</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN9614" ></A ><H2 >Name</H2 ><B CLASS="command" >IDFFactor</B > -- changes the effect of inverse document frequency<P ><B ></B ><TT CLASS="filename" >search.htm</TT ></P ></DIV ><DIV CLASS="refsynopsisdiv" ><A NAME="AEN9620" ></A ><H2 >Synopsis</H2 ><P ><B CLASS="command" >IDFFactor</B > {number}</P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN9624" ></A ><H2 ></H2 ><P > The <CODE CLASS="varname" >number</CODE > parameter is a number in the range <TT CLASS="literal" >0..255</TT > defining the effect of the <I CLASS="firstterm" >inverse word frequency (IDF)</I >, which diminishes the weight of words that occur very frequently in the document collection (such as <TT CLASS="literal" >the</TT >, <TT CLASS="literal" >a</TT >, etc) and increases the weight of words that occur rarely. </P ><P > The default value is 255. </P >Please have a look into <A HREF="http://en.wikipedia.org/wiki/Tf-idf" TARGET="_top" >TF-IDF page at Wikipedia</A >to get more information about <ACRONYM CLASS="acronym" >IDF</ACRONYM >. <P > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN9636" ></A ><H2 >Examples</H2 ><DIV CLASS="informalexample" ><P ></P ><A NAME="AEN9638" ></A ><PRE CLASS="programlisting" > IDFFactor 40 </PRE ><P ></P ></DIV ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN9640" ></A ><H2 >See also</H2 ><P > <A HREF="msearch-cmdref-docsizeweight.html" >DocSizeWeight</A > <A HREF="msearch-cmdref-mincoordfactor.html" >MinCoordFactor</A > <A HREF="msearch-cmdref-numdistinctwordfactor.html" >NumDistinctWordFactor</A > <A HREF="msearch-cmdref-numwordfactor.html" >NumWordFactor</A > <A HREF="msearch-cmdref-wordformfactor.html" >WordFormFactor</A > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="msearch-cmdref-httpheader.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="msearch-cmdref-importenv.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >HTTPHeader</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="msearch-cmdref.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >ImportEnv</TD ></TR ></TABLE ></DIV ><!--#include virtual="body-after.html"--></BODY ></HTML >