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| 21 | <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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| 22 | <div class="fragment"><pre class="fragment"><span class="preprocessor">#include <itpp/itbase.h></span> |
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| 23 | |
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| 24 | <span class="keyword">using namespace </span>itpp; |
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| 25 | |
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| 26 | <span class="comment">//These lines are needed for use of cout and endl</span> |
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| 27 | <span class="keyword">using</span> std::cout; |
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| 28 | <span class="keyword">using</span> std::endl; |
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| 29 | |
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| 30 | <span class="keywordtype">int</span> main() |
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| 31 | { |
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| 32 | <span class="comment">//Declare vectors and matricies:</span> |
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| 33 | vec a, b, c; |
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| 34 | mat A, B; |
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| 35 | |
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| 36 | <span class="comment">//Use the function linspace to define a vector:</span> |
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| 37 | a = linspace(1.0, 2.0, 10); |
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| 38 | |
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| 39 | <span class="comment">//Use a string of values to define a vector:</span> |
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| 40 | 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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| 41 | |
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| 42 | <span class="comment">//Add two vectors:</span> |
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| 43 | c = a + b; |
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| 44 | |
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| 45 | <span class="comment">//Print results:</span> |
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| 46 | cout << <span class="stringliteral">"a = "</span> << a << endl; |
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| 47 | cout << <span class="stringliteral">"b = "</span> << b << endl; |
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| 48 | cout << <span class="stringliteral">"c = "</span> << c << endl; |
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| 49 | |
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| 50 | <span class="comment">//Use a string to define a matrix:</span> |
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| 51 | A = <span class="stringliteral">"1.0 2.0;3.0 4.0"</span>; |
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| 52 | |
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| 53 | <span class="comment">//Calculate the inverse of matrix A:</span> |
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| 54 | B = inv(A); |
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| 55 | |
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| 56 | <span class="comment">//Print results:</span> |
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| 57 | cout << <span class="stringliteral">"A = "</span> << A << endl; |
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| 58 | cout << <span class="stringliteral">"B = "</span> << B << endl; |
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| 59 | |
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| 60 | <span class="comment">//Exit program:</span> |
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| 61 | <span class="keywordflow">return</span> 0; |
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| 62 | |
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| 63 | } |
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| 64 | </pre></div><p> |
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| 65 | When you run this program, the output shall look like this<p> |
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| 66 | <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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| 67 | b = [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1] |
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| 68 | c = [1.1 1.31111 1.52222 1.73333 1.94444 2.15556 2.36667 2.57778 2.78889 3] |
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| 69 | A = [[1 2] |
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| 70 | [3 4]] |
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| 71 | B = [[-2 1] |
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| 72 | [1.5 -0.5]] |
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| 73 | </pre></div><p> |
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| 74 | If this is what you see, then congratulations! You have managed to compile your first it++ program! </div> |
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| 75 | <hr size="1"><address style="text-align: right;"><small>Generated on Fri Feb 6 15:29:47 2009 for mixpp by |
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