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66
67<h1><a class="anchor" id="vector_and_matrix">A very simple tutorial about vectors and matrixes </a></h1><p>Let's start with a really simple example. Try to complile the following program:</p>
[354]68<div class="fragment"><pre class="fragment"><span class="preprocessor">#include &lt;itpp/itbase.h&gt;</span>
[261]69
70<span class="keyword">using namespace </span>itpp;
71
72<span class="comment">//These lines are needed for use of cout and endl</span>
73<span class="keyword">using</span> std::cout;
74<span class="keyword">using</span> std::endl;
75
[538]76<span class="keywordtype">int</span> main() {
77        <span class="comment">//Declare vectors and matricies:</span>
78        vec a, b, c;
79        mat A, B;
[261]80
[538]81        <span class="comment">//Use the function linspace to define a vector:</span>
82        a = linspace ( 1.0, 2.0, 10 );
[261]83
[538]84        <span class="comment">//Use a string of values to define a vector:</span>
[591]85        b = <span class="stringliteral">&quot;0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0&quot;</span>;
[261]86
[538]87        <span class="comment">//Add two vectors:</span>
88        c = a + b;
[261]89
[538]90        <span class="comment">//Print results:</span>
[591]91        cout &lt;&lt; <span class="stringliteral">&quot;a = &quot;</span> &lt;&lt; a &lt;&lt; endl;
92        cout &lt;&lt; <span class="stringliteral">&quot;b = &quot;</span> &lt;&lt; b &lt;&lt; endl;
93        cout &lt;&lt; <span class="stringliteral">&quot;c = &quot;</span> &lt;&lt; c &lt;&lt; endl;
[261]94
[538]95        <span class="comment">//Use a string to define a matrix:</span>
[591]96        A = <span class="stringliteral">&quot;1.0 2.0;3.0 4.0&quot;</span>;
[261]97
[538]98        <span class="comment">//Calculate the inverse of matrix A:</span>
99        B = inv ( A );
[261]100
[538]101        <span class="comment">//Print results:</span>
[591]102        cout &lt;&lt; <span class="stringliteral">&quot;A = &quot;</span> &lt;&lt; A &lt;&lt; endl;
103        cout &lt;&lt; <span class="stringliteral">&quot;B = &quot;</span> &lt;&lt; B &lt;&lt; endl;
[261]104
[538]105        <span class="comment">//Exit program:</span>
106        <span class="keywordflow">return</span> 0;
[261]107
108}
[591]109</pre></div><p>When you run this program, the output shall look like this</p>
[261]110<div class="fragment"><pre class="fragment">a = [1 1.11111 1.22222 1.33333 1.44444 1.55556 1.66667 1.77778 1.88889 2]
111b = [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1]
112c = [1.1 1.31111 1.52222 1.73333 1.94444 2.15556 2.36667 2.57778 2.78889 3]
113A = [[1 2]
114 [3 4]]
115B = [[-2 1]
116 [1.5 -0.5]]
[591]117</pre></div><p>If this is what you see, then congratulations! You have managed to compile your first it++ program! </p>
118</div>
119<hr size="1"/><address style="text-align: right;"><small>Generated on Sun Aug 30 22:10:50 2009 for mixpp by&nbsp;
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