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<!DOCTYPE html> <html lang="en"> <head> <title>chordalNet -- constructs a chordal network from a polynomial set</title> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <link type="text/css" rel="stylesheet" href="../../../../Macaulay2/Style/doc.css"> <link rel="stylesheet" href="../../../../Macaulay2/Style/katex/katex.min.css"> <script defer="defer" src="../../../../Macaulay2/Style/katex/katex.min.js"></script> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/auto-render.min.js"></script> <script> var macros = { "\\break": "\\\\", "\\ZZ": "\\mathbb{Z}", "\\NN": "\\mathbb{N}", "\\QQ": "\\mathbb{Q}", "\\RR": "\\mathbb{R}", "\\CC": "\\mathbb{C}", "\\PP": "\\mathbb{P}" }, delimiters = [ { left: "$$", right: "$$", display: true}, { left: "\\[", right: "\\]", display: true}, { left: "$", right: "$", display: false}, { left: "\\(", right: "\\)", display: false} ], ignoredTags = [ "kbd", "var", "samp", "script", "noscript", "style", "textarea", "pre", "code", "option" ]; document.addEventListener("DOMContentLoaded", function() { renderMathInElement(document.body, { delimiters: delimiters, macros: macros, ignoredTags: ignoredTags, trust: true }); }); </script> <style>.katex { font-size: 1em; }</style> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/copy-tex.min.js"></script> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/render-a11y-string.min.js"></script> <script src="../../../../Macaulay2/Style/prism.js"></script> <script>var current_version = '1.25.06';</script> <script src="../../../../Macaulay2/Style/version-select.js"></script> <link type="image/x-icon" rel="icon" href="../../../../Macaulay2/Style/icon.gif"> </head> <body> <div id="buttons"> <div> <a href="https://macaulay2.com/">Macaulay2</a> <span id="version-select-container"></span> » <a title="Macaulay2 documentation" href="../../Macaulay2Doc/html/index.html">Documentation </a> <br><a href="../../Macaulay2Doc/html/_packages_spprovided_spwith_sp__Macaulay2.html">Packages</a> » <span><a title="exploiting chordal structure in polynomial ideals" href="index.html">Chordal</a> :: <a title="constructs a chordal network from a polynomial set" href="_chordal__Net.html">chordalNet</a></span> </div> <div class="right"> <form method="get" action="https://www.google.com/search"> <input placeholder="Search" type="text" name="q" value=""> <input type="hidden" name="q" value="site:macaulay2.com/doc"> </form> <a href="_chordal__Net_lp__Hash__Table_cm__Hash__Table_cm__Elim__Tree_cm__Digraph_rp.html">next</a> | <a href="___Chordal__Net.html">previous</a> | <a href="_chordal__Net_lp__Hash__Table_cm__Hash__Table_cm__Elim__Tree_cm__Digraph_rp.html">forward</a> | <a href="___Chordal__Net.html">backward</a> | up | <a href="master.html">index</a> | <a href="toc.html">toc</a> </div> </div> <hr> <div> <h1>chordalNet -- constructs a chordal network from a polynomial set</h1> <ul> <li> <dl class="element"> <dt>Usage: </dt> <dd><code class="language-macaulay2">chordalNet I</code></dd> <dd><code class="language-macaulay2">chordalNet (I, X)</code></dd> <dd><code class="language-macaulay2">chordalNet (I, "SuggestOrder")</code></dd> </dl> </li> <li>Inputs: <ul> <li><span><span class="tt">I</span>, <span>an <a title="the class of all ideals" href="../../Macaulay2Doc/html/___Ideal.html">ideal</a></span>, </span></li> <li><span><span class="tt">X</span>, <span>a <a title="the class of all lists -- {...}" href="../../Macaulay2Doc/html/___List.html">list</a></span>, of variables (optional)</span></li> <li><span><span class="tt">str</span>, <span>a <a title="the class of all strings" href="../../Macaulay2Doc/html/___String.html">string</a></span>, (optional)</span></li> </ul> </li> <li>Outputs: <ul> <li><span><span>an instance of the type <a title="a chordal network" href="___Chordal__Net.html">ChordalNet</a></span>, chordal network constructed from <span class="tt">I</span></span></li> </ul> </li> </ul> <div> <h2>Description</h2> <div> <p>This method constructs a chordal network from a given polynomial set F. This chordal network is a directed graph, whose nodes define a partition of F. The arcs of the directed graph are given by the <a title="elimination tree of a chordal graph" href="_elim__Tree.html">elimination tree</a> of the associated <a title="constraint graph of a polynomial set" href="_constraint__Graph.html">constraint graph</a>.</p> <p></p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i1 : R = QQ[x_0..x_3, MonomialOrder=>Lex];</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i2 : I = ideal {x_0^3-x_0, x_0*x_2-x_2, x_1-x_2, x_2^2-x_2, x_2*x_3^2-x_3}; o2 : Ideal of R</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i3 : N = chordalNet I 3 2 o3 = ChordalNet{ x => {{x - x , x x - x , x - x }} } 0 0 0 0 2 2 2 2 2 x => {{x - x , x - x }} 1 1 2 2 2 2 x => {x x - x } 2 2 3 3 x => { } 3 o3 : ChordalNet</code></pre> </td> </tr> </table> <div> <p>Selecting a good variable ordering is very important for the complexity of chordal networks methods. The variable ordering can be specified in the input. Alternatively, the string "SuggestOrder" can be used.</p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i4 : G = cartesianProduct(cycleGraph 3, pathGraph 3);</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i5 : I = edgeIdeal G o5 = monomialIdeal (x x , x x , x x , x x , x x , x x , x x , x x , x x , 1 2 1 3 1 4 3 4 2 5 2 6 3 6 2 7 4 7 ------------------------------------------------------------------------ x x , x x , x x , x x , x x , x x ) 6 7 5 8 6 8 5 9 7 9 8 9 o5 : MonomialIdeal of QQ[x ..x ] 1 9</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i6 : N = chordalNet(I,"SuggestOrder") o6 = ChordalNet{ x => {{x x , x x , x x , x x }} } 1 1 2 1 3 1 4 3 4 x => {{x x , x x }} 3 2 6 3 6 x => {{x x , x x , x x }} 4 2 7 4 7 6 7 x => {x x } 2 2 5 x => {{x x , x x }} 6 5 8 6 8 x => {{x x , x x , x x }} 5 5 9 7 9 8 9 x => { } 7 x => { } 8 x => { } 9 o6 : ChordalNet</code></pre> </td> </tr> </table> <pre></pre> </div> <div> <h2>See also</h2> <ul> <li><span><a title="a chordal network" href="___Chordal__Net.html">ChordalNet</a> -- a chordal network</span></li> <li><span><a title="suggests a good variable ordering" href="_suggest__Variable__Order.html">suggestVariableOrder</a> -- suggests a good variable ordering</span></li> </ul> </div> <div> <div class="waystouse"> <h2>Ways to use <span class="tt">chordalNet</span>:</h2> <ul> <li><kbd>chordalNet(Ideal)</kbd></li> <li><kbd>chordalNet(Ideal,List)</kbd></li> <li><kbd>chordalNet(Ideal,String)</kbd></li> <li><span><a title="construct chordal network from a digraph" href="_chordal__Net_lp__Hash__Table_cm__Hash__Table_cm__Elim__Tree_cm__Digraph_rp.html">chordalNet(HashTable,HashTable,ElimTree,Digraph)</a> -- construct chordal network from a digraph</span></li> </ul> </div> <div class="waystouse"> <h2>For the programmer</h2> <p>The object <a title="constructs a chordal network from a polynomial set" href="_chordal__Net.html">chordalNet</a> is <span>a <a title="a type of method function" href="../../Macaulay2Doc/html/___Method__Function.html">method function</a></span>.</p> </div> <hr> <div class="waystouse"> <p>The source of this document is in <span class="tt">Chordal/ChordalDoc.m2:646:0</span>.</p> </div> </div> </div> </body> </html>
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