390 lines
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390 lines
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<h2>C++ Reference</h2>
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<li><a href="../cpp_algorithms/annotated.html">Algorithms</a></li>
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<li><a href="../cpp_linear/annotated.html">Linear solver</a></li>
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<h1 style="color: #145A32;">C++ Reference: Linear solver</h1>
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<li class="navelem"><a class="el" href="namespaceoperations__research.html">operations_research</a></li><li class="navelem"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a></li> </ul>
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<div class="header">
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<a href="#pub-methods">Public Member Functions</a> |
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<a href="#pub-static-methods">Static Public Member Functions</a> |
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<a href="classoperations__research_1_1LinearExpr-members.html">List of all members</a> </div>
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<div class="headertitle">
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<div class="title">LinearExpr</div> </div>
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</div><!--header-->
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<div class="contents">
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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 class="el" href="classoperations__research_1_1LinearExpr.html" title="LinearExpr models a quantity that is linear in the decision variables (MPVariable) of an optimization...">LinearExpr</a> models a quantity that is linear in the decision variables (<a class="el" href="classoperations__research_1_1MPVariable.html" title="The class for variables of a Mathematical Programming (MP) model.">MPVariable</a>) of an optimization problem, i.e. </p>
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<p>offset + sum_{i in S} a_i*x_i,</p>
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<p>where the a_i and offset are constants and the x_i are MPVariables. You can use a <a class="el" href="classoperations__research_1_1LinearExpr.html" title="LinearExpr models a quantity that is linear in the decision variables (MPVariable) of an optimization...">LinearExpr</a> "linear_expr" with an <a class="el" href="classoperations__research_1_1MPSolver.html" title="This mathematical programming (MP) solver class is the main class though which users build and solve ...">MPSolver</a> "solver" to:</p><ul>
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<li><p class="startli">Set as the objective of your optimization problem, e.g.</p>
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<p class="startli">solver.MutableObjective()->MaximizeLinearExpr(linear_expr);</p>
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</li>
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<li><p class="startli">Create a constraint in your optimization, e.g.</p>
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<p class="startli">solver.MakeRowConstraint(linear_expr1 <= linear_expr2);</p>
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</li>
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<li><p class="startli">Get the value of the quantity after solving, e.g.</p>
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<p class="startli">solver.Solve(); linear_expr.SolutionValue();</p>
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</li>
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</ul>
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<p><a class="el" href="classoperations__research_1_1LinearExpr.html" title="LinearExpr models a quantity that is linear in the decision variables (MPVariable) of an optimization...">LinearExpr</a> is allowed to delete variables with coefficient zero from the map, but is not obligated to do so. </p>
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<p class="definition">Definition at line <a class="el" href="linear__expr_8h_source.html#l00114">114</a> of file <a class="el" href="linear__expr_8h_source.html">linear_expr.h</a>.</p>
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</div><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:a708e7b52aae1fa3c440ef7ced3f06cd9"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a708e7b52aae1fa3c440ef7ced3f06cd9">LinearExpr</a> ()</td></tr>
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<tr class="separator:a708e7b52aae1fa3c440ef7ced3f06cd9"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7b163def8264a8ab405bb6069340d2c6"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a7b163def8264a8ab405bb6069340d2c6">LinearExpr</a> (double constant)</td></tr>
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<tr class="memdesc:a7b163def8264a8ab405bb6069340d2c6"><td class="mdescLeft"> </td><td class="mdescRight">Possible implicit conversions are intentional. <a href="classoperations__research_1_1LinearExpr.html#a7b163def8264a8ab405bb6069340d2c6">More...</a><br /></td></tr>
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<tr class="separator:a7b163def8264a8ab405bb6069340d2c6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab2ca0acd2e70df1dbf8ec0d516bc7fcc"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#ab2ca0acd2e70df1dbf8ec0d516bc7fcc">LinearExpr</a> (const <a class="el" href="classoperations__research_1_1MPVariable.html">MPVariable</a> *var)</td></tr>
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<tr class="separator:ab2ca0acd2e70df1dbf8ec0d516bc7fcc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:af45a590e01bfd8bf93c5f41a296f7b9a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#af45a590e01bfd8bf93c5f41a296f7b9a">operator+=</a> (const <a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> &rhs)</td></tr>
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<tr class="separator:af45a590e01bfd8bf93c5f41a296f7b9a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad5070ceea6bb6c91e5ead49dd67696e4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#ad5070ceea6bb6c91e5ead49dd67696e4">operator-=</a> (const <a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> &rhs)</td></tr>
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<tr class="separator:ad5070ceea6bb6c91e5ead49dd67696e4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5a3e5b8fa7c10e4b347e9757ba54360c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a5a3e5b8fa7c10e4b347e9757ba54360c">operator*=</a> (double rhs)</td></tr>
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<tr class="separator:a5a3e5b8fa7c10e4b347e9757ba54360c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad77266a8988cfa2f5dcb9d25276cd4dc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#ad77266a8988cfa2f5dcb9d25276cd4dc">operator/=</a> (double rhs)</td></tr>
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<tr class="separator:ad77266a8988cfa2f5dcb9d25276cd4dc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a32985ab0882c48b374e1d26e0fdf9ce6"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a32985ab0882c48b374e1d26e0fdf9ce6">operator-</a> () const</td></tr>
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<tr class="separator:a32985ab0882c48b374e1d26e0fdf9ce6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a96ffc785b7b2135c7980c985883ffdd3"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a96ffc785b7b2135c7980c985883ffdd3">offset</a> () const</td></tr>
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<tr class="separator:a96ffc785b7b2135c7980c985883ffdd3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a665001590f89bb9446d0030e2ef8047b"><td class="memItemLeft" align="right" valign="top">const absl::flat_hash_map< const <a class="el" href="classoperations__research_1_1MPVariable.html">MPVariable</a> *, double > & </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a665001590f89bb9446d0030e2ef8047b">terms</a> () const</td></tr>
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<tr class="separator:a665001590f89bb9446d0030e2ef8047b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1953d5ae154875095008836cd15ab348"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a1953d5ae154875095008836cd15ab348">SolutionValue</a> () const</td></tr>
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<tr class="memdesc:a1953d5ae154875095008836cd15ab348"><td class="mdescLeft"> </td><td class="mdescRight">Evaluates the value of this expression at the solution found. <a href="classoperations__research_1_1LinearExpr.html#a1953d5ae154875095008836cd15ab348">More...</a><br /></td></tr>
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<tr class="separator:a1953d5ae154875095008836cd15ab348"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a19c380b03cea21d7ac7325136a131ff0"><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a19c380b03cea21d7ac7325136a131ff0">ToString</a> () const</td></tr>
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<tr class="memdesc:a19c380b03cea21d7ac7325136a131ff0"><td class="mdescLeft"> </td><td class="mdescRight">A human readable representation of this. <a href="classoperations__research_1_1LinearExpr.html#a19c380b03cea21d7ac7325136a131ff0">More...</a><br /></td></tr>
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<tr class="separator:a19c380b03cea21d7ac7325136a131ff0"><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-static-methods"></a>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:a11dac3cad352ecca7e70e1c82b93a419"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1LinearExpr.html#a11dac3cad352ecca7e70e1c82b93a419">NotVar</a> (<a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> var)</td></tr>
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<tr class="memdesc:a11dac3cad352ecca7e70e1c82b93a419"><td class="mdescLeft"> </td><td class="mdescRight">Returns 1-var. <a href="classoperations__research_1_1LinearExpr.html#a11dac3cad352ecca7e70e1c82b93a419">More...</a><br /></td></tr>
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<tr class="separator:a11dac3cad352ecca7e70e1c82b93a419"><td class="memSeparator" colspan="2"> </td></tr>
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<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<a id="a708e7b52aae1fa3c440ef7ced3f06cd9"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a708e7b52aae1fa3c440ef7ced3f06cd9">◆ </a></span>LinearExpr() <span class="overload">[1/3]</span></h2>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> </td>
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<td>(</td>
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<h2 class="memtitle"><span class="permalink"><a href="#a7b163def8264a8ab405bb6069340d2c6">◆ </a></span>LinearExpr() <span class="overload">[2/3]</span></h2>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> </td>
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<td>(</td>
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<p>Possible implicit conversions are intentional. </p>
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<a id="ab2ca0acd2e70df1dbf8ec0d516bc7fcc"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ab2ca0acd2e70df1dbf8ec0d516bc7fcc">◆ </a></span>LinearExpr() <span class="overload">[3/3]</span></h2>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classoperations__research_1_1MPVariable.html">MPVariable</a> * </td>
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<td class="paramname"><em>var</em></td><td>)</td>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a11dac3cad352ecca7e70e1c82b93a419">◆ </a></span>NotVar()</h2>
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<td class="memname">static <a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> NotVar </td>
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<td class="paramtype"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> </td>
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<p>Returns 1-var. </p>
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<p>NOTE(user): if var is binary variable, this corresponds to the logical negation of var. Passing by value is intentional, see the discussion on binary ops. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a96ffc785b7b2135c7980c985883ffdd3">◆ </a></span>offset()</h2>
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<p class="definition">Definition at line <a class="el" href="linear__expr_8h_source.html#l00141">141</a> of file <a class="el" href="linear__expr_8h_source.html">linear_expr.h</a>.</p>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a>& operator*= </td>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a>& operator+= </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a32985ab0882c48b374e1d26e0fdf9ce6">◆ </a></span>operator-()</h2>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> operator- </td>
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<h2 class="memtitle"><span class="permalink"><a href="#ad5070ceea6bb6c91e5ead49dd67696e4">◆ </a></span>operator-=()</h2>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a>& operator-= </td>
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<td class="paramtype">const <a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a> & </td>
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<h2 class="memtitle"><span class="permalink"><a href="#ad77266a8988cfa2f5dcb9d25276cd4dc">◆ </a></span>operator/=()</h2>
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<td class="memname"><a class="el" href="classoperations__research_1_1LinearExpr.html">LinearExpr</a>& operator/= </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a1953d5ae154875095008836cd15ab348">◆ </a></span>SolutionValue()</h2>
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<p>Evaluates the value of this expression at the solution found. </p>
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<p>It must be called only after calling <a class="el" href="classoperations__research_1_1MPSolver.html#a9f55f5e7a62b45961982063ebc1e9945" title="Solves the problem using the default parameter values.">MPSolver::Solve</a>. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a665001590f89bb9446d0030e2ef8047b">◆ </a></span>terms()</h2>
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<td class="memname">const absl::flat_hash_map<const <a class="el" href="classoperations__research_1_1MPVariable.html">MPVariable</a>*, double>& terms </td>
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<p class="definition">Definition at line <a class="el" href="linear__expr_8h_source.html#l00142">142</a> of file <a class="el" href="linear__expr_8h_source.html">linear_expr.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a19c380b03cea21d7ac7325136a131ff0">◆ </a></span>ToString()</h2>
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<td class="memname">std::string ToString </td>
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<p>A human readable representation of this. </p>
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<p>Variables will be printed in order of lowest index first. </p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="linear__expr_8h_source.html">linear_expr.h</a></li>
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