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<h1>
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Sorting an array
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</h1>
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<time class="published" datetime="2018-11-07T22:22:00+01:00">
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07 novembre 2018
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</li>
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<li>Python</li>
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<li>Basics</li>
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</header>
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<div class='article_content'>
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<h2>Using lists</h2>
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<p>Python provides an iterator to sort an array <a href="https://www.python.org/dev/peps/pep-0322/">sorted()</a></p>
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<p>you can use it this way :</p>
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<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">random</span>
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<span class="c1"># Random lists from [0-999] interval</span>
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<span class="n">arr</span> <span class="o">=</span> <span class="p">[</span><span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1000</span><span class="p">)</span> <span class="k">for</span> <span class="n">r</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>
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<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">'Initial random list : {arr}</span><span class="se">\n</span><span class="s1">'</span><span class="p">)</span>
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<span class="n">reversed_arr</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="nb">sorted</span><span class="p">(</span><span class="n">arr</span><span class="p">))</span>
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<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">'Sorted list : {reversed_arr}'</span><span class="p">)</span>
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</pre></div>
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<div class="highlight"><pre><span></span>Initial random list : [277, 347, 976, 367, 604, 878, 148, 670, 229, 432]
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Sorted list : [148, 229, 277, 347, 367, 432, 604, 670, 878, 976]
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</pre></div>
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<p>it is also possible to use the sort function from the list object</p>
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<div class="highlight"><pre><span></span><span class="c1"># Random lists from [0-999] interval</span>
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<span class="n">arr</span> <span class="o">=</span> <span class="p">[</span><span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1000</span><span class="p">)</span> <span class="k">for</span> <span class="n">r</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)]</span>
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<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">'Initial random list : {arr}</span><span class="se">\n</span><span class="s1">'</span><span class="p">)</span>
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<span class="n">arr</span><span class="o">.</span><span class="n">sort</span><span class="p">()</span>
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<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">'Sorted list : {arr}'</span><span class="p">)</span>
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</pre></div>
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<div class="highlight"><pre><span></span>Initial random list : [727, 759, 68, 103, 23, 90, 258, 737, 791, 567]
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Sorted list : [23, 68, 90, 103, 258, 567, 727, 737, 759, 791]
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</pre></div>
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<h2>Using numpy</h2>
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<p>If you are using numpy you can sort an array by creating a view on the array:</p>
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<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
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<span class="n">arr</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">random</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span>
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<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">'Initial random array : {arr}</span><span class="se">\n</span><span class="s1">'</span><span class="p">)</span>
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<span class="n">sorted_arr</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">sort</span><span class="p">(</span><span class="n">arr</span><span class="p">)</span>
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<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">'Sorted array : {sorted_arr}'</span><span class="p">)</span>
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</pre></div>
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<div class="highlight"><pre><span></span>Initial random array : [0.40021786 0.13876208 0.19939047 0.46015169 0.43734158]
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Sorted array : [0.13876208 0.19939047 0.40021786 0.43734158 0.46015169]
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</pre></div>
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