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<div class="textblock"><div class="fragment"><div class="line"><span class="preprocessor">#include &lt;Eigen/Sparse&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;QImage&gt;</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">typedef</span> <a class="code" href="classEigen_1_1SparseMatrix.html">Eigen::SparseMatrix&lt;double&gt;</a> SpMat; <span class="comment">// declares a column-major sparse matrix type of double</span></div>
<div class="line"><span class="keyword">typedef</span> <a class="code" href="classEigen_1_1Triplet.html">Eigen::Triplet&lt;double&gt;</a> T;</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> insertCoefficient(<span class="keywordtype">int</span> <span class="keywordtype">id</span>, <span class="keywordtype">int</span> i, <span class="keywordtype">int</span> j, <span class="keywordtype">double</span> w, std::vector&lt;T&gt;&amp; coeffs,</div>
<div class="line">                       <a class="code" href="classEigen_1_1Matrix.html">Eigen::VectorXd</a>&amp; b, <span class="keyword">const</span> <a class="code" href="classEigen_1_1Matrix.html">Eigen::VectorXd</a>&amp; boundary)</div>
<div class="line">{</div>
<div class="line">  <span class="keywordtype">int</span> n = boundary.size();</div>
<div class="line">  <span class="keywordtype">int</span> id1 = i+j*n;</div>
<div class="line"></div>
<div class="line">        <span class="keywordflow">if</span>(i==-1 || i==n) b(<span class="keywordtype">id</span>) -= w * boundary(j); <span class="comment">// constrained coeffcieint</span></div>
<div class="line">  <span class="keywordflow">else</span>  <span class="keywordflow">if</span>(j==-1 || j==n) b(<span class="keywordtype">id</span>) -= w * boundary(i); <span class="comment">// constrained coeffcieint</span></div>
<div class="line">  <span class="keywordflow">else</span>  coeffs.push_back(T(<span class="keywordtype">id</span>,id1,w));              <span class="comment">// unknown coefficient</span></div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> buildProblem(std::vector&lt;T&gt;&amp; coefficients, <a class="code" href="classEigen_1_1Matrix.html">Eigen::VectorXd</a>&amp; b, <span class="keywordtype">int</span> n)</div>
<div class="line">{</div>
<div class="line">  b.<a class="code" href="classEigen_1_1PlainObjectBase.html#a04abe84a9a894de335a232681d9a0722">setZero</a>();</div>
<div class="line">  Eigen::ArrayXd boundary = Eigen::ArrayXd::LinSpaced(n, 0,M_PI).sin().pow(2);</div>
<div class="line">  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j=0; j&lt;n; ++j)</div>
<div class="line">  {</div>
<div class="line">    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i&lt;n; ++i)</div>
<div class="line">    {</div>
<div class="line">      <span class="keywordtype">int</span> <span class="keywordtype">id</span> = i+j*n;</div>
<div class="line">      insertCoefficient(<span class="keywordtype">id</span>, i-1,j, -1, coefficients, b, boundary);</div>
<div class="line">      insertCoefficient(<span class="keywordtype">id</span>, i+1,j, -1, coefficients, b, boundary);</div>
<div class="line">      insertCoefficient(<span class="keywordtype">id</span>, i,j-1, -1, coefficients, b, boundary);</div>
<div class="line">      insertCoefficient(<span class="keywordtype">id</span>, i,j+1, -1, coefficients, b, boundary);</div>
<div class="line">      insertCoefficient(<span class="keywordtype">id</span>, i,j,    4, coefficients, b, boundary);</div>
<div class="line">    }</div>
<div class="line">  }</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> saveAsBitmap(<span class="keyword">const</span> <a class="code" href="classEigen_1_1Matrix.html">Eigen::VectorXd</a>&amp; x, <span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">char</span>* filename)</div>
<div class="line">{</div>
<div class="line">  <a class="code" href="classEigen_1_1Array.html">Eigen::Array&lt;unsigned char,Eigen::Dynamic,Eigen::Dynamic&gt;</a> bits = (x*255).cast&lt;unsigned char&gt;();</div>
<div class="line">  QImage img(bits.<a class="code" href="classEigen_1_1PlainObjectBase.html#a40dcc334db75411e168691d9bce08c3a">data</a>(), n,n,QImage::Format_Indexed8);</div>
<div class="line">  img.setColorCount(256);</div>
<div class="line">  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0;i&lt;256;i++) img.setColor(i,qRgb(i,i,i));</div>
<div class="line">  img.save(filename);</div>
<div class="line">}</div>
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