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sort an array
extract unique values from an array
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redoules 2018-11-07 22:39:48 +01:00
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index.html
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<ul>
<li><a href="./python/unique.html">Extracting unique values from a list or an array</a></li>
<li><a href="./python/sorting.html">Sorting an array</a></li>
<li><a href="./python/reverse.html">Reverse an array</a></li>
<li><a href="./python/design_own_libs.html">Advice for designing your own libraries</a></li>
<li><a href="./python/ensure_dir.html">Safely creating a folder if it doesn't exist</a></li>
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<h2>Using lists</h2>
<p>Python provides an iterator to sort an array <a href="https://www.python.org/dev/peps/pep-0322/">sorted()</a></p>
<p>you can use it this way :</p>
<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">random</span>
<span class="c1"># Random lists from [0-999] interval</span>
<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>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Initial random list : {arr}</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)</span>
<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>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Sorted list : {reversed_arr}&#39;</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span>Initial random list : [277, 347, 976, 367, 604, 878, 148, 670, 229, 432]
Sorted list : [148, 229, 277, 347, 367, 432, 604, 670, 878, 976]
</pre></div>
<p>it is also possible to use the sort function from the list object</p>
<div class="highlight"><pre><span></span><span class="c1"># Random lists from [0-999] interval</span>
<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>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Initial random list : {arr}</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)</span>
<span class="n">arr</span><span class="o">.</span><span class="n">sort</span><span class="p">()</span>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Sorted list : {arr}&#39;</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span>Initial random list : [727, 759, 68, 103, 23, 90, 258, 737, 791, 567]
Sorted list : [23, 68, 90, 103, 258, 567, 727, 737, 759, 791]
</pre></div>
<h2>Using numpy</h2>
<p>If you are using numpy you can sort an array by creating a view on the array:</p>
<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>
<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>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Initial random array : {arr}</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)</span>
<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>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Sorted array : {sorted_arr}&#39;</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span>Initial random array : [0.40021786 0.13876208 0.19939047 0.46015169 0.43734158]
Sorted array : [0.13876208 0.19939047 0.40021786 0.43734158 0.46015169]
</pre></div>
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Extracting unique values from a list or an array
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<h2>Using lists</h2>
<p>An easy way to extract the unique values of a list in python is to convert the list to a set. A set is an unordered collection of items. Every element is unique (no duplicates) and must be immutable. </p>
<div class="highlight"><pre><span></span><span class="n">my_list</span> <span class="o">=</span> <span class="p">[</span><span class="mi">10</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">30</span><span class="p">,</span> <span class="mi">40</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="mi">40</span><span class="p">]</span>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s2">&quot;Original List : {my_list}&quot;</span><span class="p">)</span>
<span class="n">my_set</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">my_list</span><span class="p">)</span>
<span class="n">my_new_list</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">my_set</span><span class="p">)</span> <span class="c1"># the set is converted back to a list with the list() function</span>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s2">&quot;List of unique numbers : {my_new_list}&quot;</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span>Original List : [10, 20, 30, 40, 20, 50, 60, 40]
List of unique numbers : [40, 10, 50, 20, 60, 30]
</pre></div>
<h2>Using numpy</h2>
<p>If you are using numpy you can extract the unique values of an array with the unique function builtin numpy:</p>
<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>
<span class="n">arr</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">(</span><span class="n">my_list</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Initial numpy array : {arr}</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)</span>
<span class="n">unique_arr</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">unique</span><span class="p">(</span><span class="n">arr</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Numpy array with unique values : {unique_arr}&#39;</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span>Initial numpy array : [10 20 30 40 20 50 60 40]
Numpy array with unique values : [10 20 30 40 50 60]
</pre></div>
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<p class="text-muted">
<center>This project contains 42 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 44 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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