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<li class="navelem"><a class="el" href="namespacefea.html">fea</a></li><li class="navelem"><a class="el" href="structfea_1_1_equation.html">Equation</a></li> </ul>
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<div class="title">fea::Equation Struct Reference</div> </div>
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<p>A linear multipoint constraint.
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<a href="structfea_1_1_equation.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="containers_8h_source.html">containers.h</a>></code></p>
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<table class="memberdecls">
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Classes</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structfea_1_1_equation_1_1_term.html">Term</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">A single term in the equation constraint. <a href="structfea_1_1_equation_1_1_term.html#details">More...</a><br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a22d1668ad3cefaea597761eebb7c8a24"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structfea_1_1_equation.html#a22d1668ad3cefaea597761eebb7c8a24">Equation</a> ()</td></tr>
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<tr class="memitem:a1b996fd725fe977202ecd15cba6254ef"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structfea_1_1_equation.html#a1b996fd725fe977202ecd15cba6254ef">Equation</a> (const std::vector< <a class="el" href="structfea_1_1_equation_1_1_term.html">Term</a> > &_terms)</td></tr>
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<tr class="memdesc:a1b996fd725fe977202ecd15cba6254ef"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <a href="#a1b996fd725fe977202ecd15cba6254ef">More...</a><br /></td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
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Public Attributes</h2></td></tr>
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<tr class="memitem:a270e2fc1882bbc16abb25e280d51141f"><td class="memItemLeft" align="right" valign="top">std::vector< <a class="el" href="structfea_1_1_equation_1_1_term.html">Term</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="structfea_1_1_equation.html#a270e2fc1882bbc16abb25e280d51141f">terms</a></td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>A linear multipoint constraint. </p>
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<p><a class="el" href="structfea_1_1_equation.html" title="A linear multipoint constraint. ">Equation</a> constraints are defined by a series of terms that sum to zero, e.g. <code>t1 + t2 + t3 ... = 0</code>, where <code>tn</code> is the <code>n</code>th term. Each term specifies the node number, degree of freedom and coefficient. The node number and degree of freedom specify which nodal variable (either nodal displacement or rotation) is involved with the equation constraint, and coefficient is multiplied by the specified nodal variable when forming the equation. Note, the equation sums to zero, so in order to specify that 2 nodal degrees of freedom are equal their coefficients should be equal and opposite.</p>
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<div class="fragment"><div class="line"><span class="comment">// Create an empty equation</span></div>
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<div class="line"><a class="code" href="structfea_1_1_equation.html">fea::Equation</a> eqn;</div>
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<div class="line"></div>
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<div class="line"><span class="comment">// Stipulate that the x and y displacement for the first node must be equal</span></div>
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<div class="line"><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> node_number = 0;</div>
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<div class="line">eqn.<a class="code" href="structfea_1_1_equation.html#a270e2fc1882bbc16abb25e280d51141f">terms</a>.push_back(<a class="code" href="structfea_1_1_equation_1_1_term.html">fea::Equation::Term</a>(node_number, <a class="code" href="namespacefea.html#aeaca75d33e81b79c9282f3e69a238d72a0bfcf6fc693c952c376a1d9eb9cf03fb">fea::DOF::DISPLACEMENT_X</a>, 1.0));</div>
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<div class="line">eqn.<a class="code" href="structfea_1_1_equation.html#a270e2fc1882bbc16abb25e280d51141f">terms</a>.push_back(<a class="code" href="structfea_1_1_equation_1_1_term.html">fea::Equation::Term</a>(node_number, <a class="code" href="namespacefea.html#aeaca75d33e81b79c9282f3e69a238d72ad39e7a11a71cac64252cb1fb1d94c7f9">fea::DOF::DISPLACEMENT_Y</a>, -1.0);</div>
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</div><!-- fragment --> </div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<a class="anchor" id="a22d1668ad3cefaea597761eebb7c8a24"></a>
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<td class="memname">fea::Equation::Equation </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<p>Default constructor </p>
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<td class="memname">fea::Equation::Equation </td>
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<td>(</td>
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<td class="paramtype">const std::vector< <a class="el" href="structfea_1_1_equation_1_1_term.html">Term</a> > & </td>
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<td class="paramname"><em>_terms</em></td><td>)</td>
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<p>Constructor. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">terms.</td><td><code>std::vector<<a class="el" href="structfea_1_1_equation_1_1_term.html" title="A single term in the equation constraint. ">Term</a>></code>. A list of terms that sum to zero.k </td></tr>
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</dd>
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</dl>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">std::vector<<a class="el" href="structfea_1_1_equation_1_1_term.html">Term</a>> fea::Equation::terms</td>
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<p>A list of terms that sum to zero. </p>
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<hr/>The documentation for this struct was generated from the following file:<ul>
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<li>include/<a class="el" href="containers_8h_source.html">containers.h</a></li>
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