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<h1>matrices.h</h1><div class="fragment"><pre class="fragment">00001 <span class="preprocessor">#ifndef MATRICES_H</span>
00002 <span class="preprocessor"></span><span class="preprocessor">#define MATRICES_H</span>
00003 <span class="preprocessor"></span>
00004 <span class="preprocessor">#include &lt;vector&gt;</span>
00005
00006 <span class="keyword">class </span>lower_triangular_matrix {
00007
00008 <span class="keywordtype">unsigned</span> n;
00009 std::vector&lt;double&gt; data;
00010
00011 <span class="keyword">public</span>:
00012
00013 lower_triangular_matrix(<span class="keywordtype">unsigned</span> n_ = 0) : n(n_), data(n * (n+1) / 2) {};
00014
00015 <span class="keywordtype">void</span> resize(<span class="keywordtype">unsigned</span> n_) {
00016 n = n_;
00017 data.resize(n*(n+1)/2);
00018 }
00019
00020 std::vector&lt;double&gt;::iterator operator[](<span class="keywordtype">unsigned</span> i) { <span class="keywordflow">return</span> data.begin() + i * (i+1) / 2; }
00021 std::vector&lt;double&gt;::const_iterator operator[](<span class="keywordtype">unsigned</span> i)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> data.begin() + i*(i+1)/2; }
00022 };
00023
00024 <span class="keyword">class </span>square_matrix {
00025 <span class="keywordtype">unsigned</span> n;
00026 std::vector&lt;double&gt; data;
00027
00028 <span class="keyword">public</span>:
00029
00030 square_matrix(<span class="keywordtype">unsigned</span> n_ = 0) : n(n_), data(n * n) {};
00031
00032 <span class="keywordtype">void</span> resize(<span class="keywordtype">unsigned</span> n_) {
00033 n = n_;
00034 data.resize(n*n);
00035 }
00036
00037 std::vector&lt;double&gt;::iterator operator[](<span class="keywordtype">unsigned</span> i) { <span class="keywordflow">return</span> data.begin() + i * n; }
00038 std::vector&lt;double&gt;::const_iterator operator[](<span class="keywordtype">unsigned</span> i)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> data.begin() + i*n; }
00039 };
00040
00041 <span class="preprocessor">#endif</span>
00042 <span class="preprocessor"></span>
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