| 1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 2. |
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| 2 | Basic Model Classes |
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| 3 | </title><meta name="generator" content="DocBook XSL Stylesheets V1.66.1"><link rel="start" href="index.html" title="CLP User Guide"><link rel="up" href="index.html" title="CLP User Guide"><link rel="prev" href="ch01s02.html" title=" |
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| 4 | Prerequisites |
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| 5 | "><link rel="next" href="ch02s02.html" title=" |
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| 6 | First Example |
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| 7 | "></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 2. |
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| 8 | Basic Model Classes |
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| 9 | </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch01s02.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch02s02.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="basicmodelclasses"></a>Chapter 2. |
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| 10 | Basic Model Classes |
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| 11 | </h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="ch02.html#hierarchy"> |
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| 12 | Hierarchy |
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| 13 | </a></span></dt><dt><span class="section"><a href="ch02s02.html"> |
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| 14 | First Example |
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| 15 | </a></span></dt><dt><span class="section"><a href="ch02s03.html"> |
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| 16 | Getting at the Solution |
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| 17 | </a></span></dt><dt><span class="section"><a href="ch02s04.html"> |
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| 18 | Building and Modifying a Model |
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| 19 | </a></span></dt><dt><span class="section"><a href="ch02s05.html">Tolerances</a></span></dt><dt><span class="section"><a href="ch02s06.html">Some Useful Set and Get Methods</a></span></dt><dt><span class="section"><a href="ch02s07.html"> |
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| 20 | Simplex-specific Methods |
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| 21 | </a></span></dt><dt><span class="section"><a href="ch02s08.html"> |
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| 22 | Presolve |
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| 23 | </a></span></dt><dt><span class="section"><a href="ch02s09.html">Status Array</a></span></dt></dl></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="hierarchy"></a> |
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| 24 | Hierarchy |
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| 25 | </h2></div></div></div><p> |
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| 26 | The basic CLP model class hierarchy is simple. The top three levels of the |
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| 27 | hierarchy are depicted in the figure below. The first two levels (i.e. |
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| 28 | <tt class="classname">ClpModel</tt>, <tt class="classname">ClpSimplex</tt>, |
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| 29 | <tt class="classname">ClpInterior</tt>) contain all the problem data which define |
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| 30 | a model (that is, a problem instance). The third level contains most of the |
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| 31 | algorithmic aspects of CLP. There is a fourth level (for models with more general |
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| 32 | objectives than linear ones), but a description of it is beyond the current scope |
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| 33 | of this document. |
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| 34 | </p><div class="mediaobject"><img src="figures/clpbasicmodelhier.gif"></div><p> |
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| 35 | Most Simplex users need only concern themselves with the classes |
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| 36 | <tt class="classname">ClpModel</tt> and <tt class="classname">ClpSimplex</tt>. There |
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| 37 | are algorithm-specific classes which inherit from |
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| 38 | <tt class="classname">ClpSimplex</tt> (e.g. <tt class="classname">ClpSimplexDual</tt> |
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| 39 | and <tt class="classname">ClpSimplexPrimal</tt>), but they have no member data and |
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| 40 | rarely need be visible to the user. These classes are cast at algorithm |
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| 41 | time. So, for example, after instantiating an object |
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| 42 | <b class="userinput"><tt>model</tt></b> of type <tt class="classname">ClpSimplex</tt>, |
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| 43 | a user only need call <b class="userinput"><tt>model.dual()</tt></b> to invoke the dual |
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| 44 | simplex method. |
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| 45 | </p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch01s02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch02s02.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> |
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| 46 | Prerequisites |
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| 47 | </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> |
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| 48 | First Example |
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| 49 | </td></tr></table></div></body></html> |
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