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| [261] | 61 | </div> |
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| 62 | <div class="contents"> |
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| 63 | <h1><a class="anchor" name="vector_and_matrix">A very simple tutorial about vectors and matrixes </a></h1>Let's start with a really simple example. Try to complile the following program:<p> |
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| [354] | 64 | <div class="fragment"><pre class="fragment"><span class="preprocessor">#include <itpp/itbase.h></span> |
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| [261] | 65 | |
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| 66 | <span class="keyword">using namespace </span>itpp; |
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| 67 | |
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| 68 | <span class="comment">//These lines are needed for use of cout and endl</span> |
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| 69 | <span class="keyword">using</span> std::cout; |
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| 70 | <span class="keyword">using</span> std::endl; |
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| 71 | |
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| 72 | <span class="keywordtype">int</span> main() |
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| 73 | { |
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| 74 | <span class="comment">//Declare vectors and matricies:</span> |
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| 75 | vec a, b, c; |
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| 76 | mat A, B; |
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| 77 | |
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| 78 | <span class="comment">//Use the function linspace to define a vector:</span> |
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| [354] | 79 | a = linspace(1.0, 2.0, 10); |
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| [261] | 80 | |
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| 81 | <span class="comment">//Use a string of values to define a vector:</span> |
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| 82 | b = <span class="stringliteral">"0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0"</span>; |
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| 83 | |
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| 84 | <span class="comment">//Add two vectors:</span> |
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| 85 | c = a + b; |
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| 86 | |
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| 87 | <span class="comment">//Print results:</span> |
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| 88 | cout << <span class="stringliteral">"a = "</span> << a << endl; |
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| 89 | cout << <span class="stringliteral">"b = "</span> << b << endl; |
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| 90 | cout << <span class="stringliteral">"c = "</span> << c << endl; |
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| 91 | |
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| 92 | <span class="comment">//Use a string to define a matrix:</span> |
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| 93 | A = <span class="stringliteral">"1.0 2.0;3.0 4.0"</span>; |
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| 94 | |
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| 95 | <span class="comment">//Calculate the inverse of matrix A:</span> |
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| [354] | 96 | B = inv(A); |
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| [261] | 97 | |
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| 98 | <span class="comment">//Print results:</span> |
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| 99 | cout << <span class="stringliteral">"A = "</span> << A << endl; |
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| 100 | cout << <span class="stringliteral">"B = "</span> << B << endl; |
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| 101 | |
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| 102 | <span class="comment">//Exit program:</span> |
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| 103 | <span class="keywordflow">return</span> 0; |
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| 104 | |
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| 105 | } |
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| 106 | </pre></div><p> |
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| 107 | When you run this program, the output shall look like this<p> |
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| 108 | <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] |
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| 109 | b = [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1] |
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| 110 | c = [1.1 1.31111 1.52222 1.73333 1.94444 2.15556 2.36667 2.57778 2.78889 3] |
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| 111 | A = [[1 2] |
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| 112 | [3 4]] |
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| 113 | B = [[-2 1] |
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| 114 | [1.5 -0.5]] |
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| 115 | </pre></div><p> |
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| 116 | If this is what you see, then congratulations! You have managed to compile your first it++ program! </div> |
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| [401] | 117 | <hr size="1"><address style="text-align: right;"><small>Generated on Wed Jul 1 13:05:56 2009 for mixpp by |
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| [398] | 119 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.8 </small></address> |
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| [261] | 120 | </body> |
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