From 641834d695a65708feb05eafe8e1791e11939d66 Mon Sep 17 00:00:00 2001
From: redoules <guillaume.redoules@gadz.org>
Date: Wed, 7 Nov 2018 23:03:58 +0100
Subject: [PATCH] added an article

counting elements in a list
---
 jupyter/clear_cell.html                       |   2 +-
 linux/bashrc.html                             |   2 +-
 linux/directory_size.html                     |   2 +-
 linux/free_disk_space_linux.html              |   2 +-
 linux/get_ip_linux.html                       |   2 +-
 linux/linux_process_information.html          |   2 +-
 linux/simple_bash_function.html               |   2 +-
 linux/version_kernel.html                     |   2 +-
 mathematics/Number_edges_Complete_graph.html  |   2 +-
 ...of_eigenvalues_from_a_list_of_tensors.html |   2 +-
 python/Optimized_numpy_random_intel.html      |   2 +-
 python/counting.html                          | 230 ++++++++++++++++++
 python/dask_infiniband.html                   |   2 +-
 python/design_own_libs.html                   |   2 +-
 python/dict_comprehension.html                |   2 +-
 python/ensure_dir.html                        |   2 +-
 python/list_files_directory.html              |   2 +-
 python/reverse.html                           |   2 +-
 python/sorting.html                           |   2 +-
 python/unique.html                            |   2 +-
 20 files changed, 249 insertions(+), 19 deletions(-)
 create mode 100644 python/counting.html

diff --git a/jupyter/clear_cell.html b/jupyter/clear_cell.html
index a61d7bf..4c2798b 100644
--- a/jupyter/clear_cell.html
+++ b/jupyter/clear_cell.html
@@ -149,7 +149,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/linux/bashrc.html b/linux/bashrc.html
index 225e0f7..45bdeb5 100644
--- a/linux/bashrc.html
+++ b/linux/bashrc.html
@@ -203,7 +203,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/linux/directory_size.html b/linux/directory_size.html
index 9fd6235..e24e60b 100644
--- a/linux/directory_size.html
+++ b/linux/directory_size.html
@@ -148,7 +148,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/linux/free_disk_space_linux.html b/linux/free_disk_space_linux.html
index b06e5fc..540829d 100644
--- a/linux/free_disk_space_linux.html
+++ b/linux/free_disk_space_linux.html
@@ -167,7 +167,7 @@ none               0     0     0    - /config
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/linux/get_ip_linux.html b/linux/get_ip_linux.html
index 418fd6b..e71b6d7 100644
--- a/linux/get_ip_linux.html
+++ b/linux/get_ip_linux.html
@@ -256,7 +256,7 @@ wifi0     Link encap:UNSPEC  HWaddr 5C-51-4F-41-7A-AD-00-00-00-00-00-00-00-00-00
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/linux/linux_process_information.html b/linux/linux_process_information.html
index 36b5609..991463b 100644
--- a/linux/linux_process_information.html
+++ b/linux/linux_process_information.html
@@ -172,7 +172,7 @@ USER;PID;%CPU;%MEM;VSZ;RSS;TTY;STAT;START;TIME;COMMAND</p>
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/linux/simple_bash_function.html b/linux/simple_bash_function.html
index 4278fc2..6022203 100644
--- a/linux/simple_bash_function.html
+++ b/linux/simple_bash_function.html
@@ -208,7 +208,7 @@ The secret number is 126
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/linux/version_kernel.html b/linux/version_kernel.html
index a5056a6..d9b3020 100644
--- a/linux/version_kernel.html
+++ b/linux/version_kernel.html
@@ -160,7 +160,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/mathematics/Number_edges_Complete_graph.html b/mathematics/Number_edges_Complete_graph.html
index fd86fd6..58bddac 100644
--- a/mathematics/Number_edges_Complete_graph.html
+++ b/mathematics/Number_edges_Complete_graph.html
@@ -141,7 +141,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/Efficient_extraction_of_eigenvalues_from_a_list_of_tensors.html b/python/Efficient_extraction_of_eigenvalues_from_a_list_of_tensors.html
index 76b2691..35cdaa4 100644
--- a/python/Efficient_extraction_of_eigenvalues_from_a_list_of_tensors.html
+++ b/python/Efficient_extraction_of_eigenvalues_from_a_list_of_tensors.html
@@ -241,7 +241,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/Optimized_numpy_random_intel.html b/python/Optimized_numpy_random_intel.html
index 8c68fb0..b8ccdfb 100644
--- a/python/Optimized_numpy_random_intel.html
+++ b/python/Optimized_numpy_random_intel.html
@@ -176,7 +176,7 @@ conda install numpy --channel intel --override-channels
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/counting.html b/python/counting.html
new file mode 100644
index 0000000..1442aeb
--- /dev/null
+++ b/python/counting.html
@@ -0,0 +1,230 @@
+<!DOCTYPE html>
+<html lang="fr">
+
+<head>
+      <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
+    <meta name="description" content="Data Science for Political and Social Phenomena">
+    <meta name="author" content="Guillaume Redoulès">
+    <link rel="icon" href="../favicon.ico">
+
+    <title>Counting values in an array - Python</title>
+
+    <!-- JQuery -->
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+    <script>
+        window.jQuery || document.write('<script src="../theme/js/jquery.min.js"><\/script>')
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+                            <input class="form-control search-query" name="q" id="tipue_search_input" placeholder="e.g. scikit KNN, pandas merge" required autocomplete="off" type="text">
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+<!-- <div class="alert alert-warning" role="alert">
+    Did you find this page useful? Please do me a quick favor and <a href="#" class="alert-link">endorse me for data science on LinkedIn</a>.
+</div> -->
+<section id="content" class="body">
+    <header>
+    <h1>
+      Counting values in an array
+    </h1>
+<ol class="breadcrumb">
+    <li>
+        <time class="published" datetime="2018-11-07T22:57:00+01:00">
+            07 novembre 2018
+        </time>
+    </li>
+    <li>Python</li>
+    <li>Basics</li>
+</ol>
+</header>
+<div class='article_content'>
+<h2>Using lists</h2>
+<p>If you want to count the number of occurences of an element in a list you can use the .count() function of the list object</p>
+<div class="highlight"><pre><span></span><span class="n">arr</span> <span class="o">=</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">4</span><span class="p">,</span><span class="mi">5</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">6</span><span class="p">,</span><span class="mi">7</span><span class="p">,</span><span class="mi">7</span><span class="p">]</span>
+<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;Array : {arr}</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)</span>
+
+<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;The number 3 appears {arr.count(3)} times in the list&#39;</span><span class="p">)</span>
+<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;The number 7 appears {arr.count(7)} times in the list&#39;</span><span class="p">)</span>
+<span class="k">print</span><span class="p">(</span><span class="n">f</span><span class="s1">&#39;The number 4 appears {arr.count(4)} times in the list&#39;</span><span class="p">)</span>
+</pre></div>
+
+
+<div class="highlight"><pre><span></span>Array : [1, 2, 3, 3, 4, 5, 3, 6, 7, 7]
+
+The number 3 appears 3 times in the list
+The number 7 appears 2 times in the list
+The number 4 appears 1 times in the list
+</pre></div>
+
+
+<h2>Using collections</h2>
+<p>you can get a dictonnary of the number of occurences of each elements in a list thanks to the collections object like this</p>
+<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">collections</span>
+
+<span class="n">collections</span><span class="o">.</span><span class="n">Counter</span><span class="p">(</span><span class="n">arr</span><span class="p">)</span>
+</pre></div>
+
+
+<div class="highlight"><pre><span></span>Counter({1: 1, 2: 1, 3: 3, 4: 1, 5: 1, 6: 1, 7: 2})
+</pre></div>
+
+
+<h2>Using numpy</h2>
+<p>You can have a simular result with numpy by hacking the unique function </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">arr</span><span class="p">)</span>
+<span class="n">unique</span><span class="p">,</span> <span class="n">counts</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="n">return_counts</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
+<span class="nb">dict</span><span class="p">(</span><span class="nb">zip</span><span class="p">(</span><span class="n">unique</span><span class="p">,</span> <span class="n">counts</span><span class="p">))</span>
+</pre></div>
+
+
+<div class="highlight"><pre><span></span>{1: 1, 2: 1, 3: 3, 4: 1, 5: 1, 6: 1, 7: 2}
+</pre></div>
+</div>
+    <aside>
+    <div class="bug-reporting__panel">
+        <h3>Find an error or bug? Have a suggestion?</h3>
+        <p>Everything on this site is avaliable on GitHub. Head on over and <a href='https://github.com/redoules/redoules.github.io/issues/new'>submit an issue.</a> You can also message me directly by <a href='mailto:guillaume.redoules@gadz.org'>email</a>.</p>
+    </div>
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+    <!-- start of footer section -->
+    <footer class="footer">
+        <div class="container">
+            <p class="text-muted">
+                <center>This project contains 46 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>.
+                </center>
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\ No newline at end of file
diff --git a/python/dask_infiniband.html b/python/dask_infiniband.html
index 74a8aad..3e884fd 100644
--- a/python/dask_infiniband.html
+++ b/python/dask_infiniband.html
@@ -148,7 +148,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/design_own_libs.html b/python/design_own_libs.html
index 05e4d49..ac6e81c 100644
--- a/python/design_own_libs.html
+++ b/python/design_own_libs.html
@@ -232,7 +232,7 @@ The list of dependencies required to test, build and generate the doc are listed
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/dict_comprehension.html b/python/dict_comprehension.html
index bf38035..faa8084 100644
--- a/python/dict_comprehension.html
+++ b/python/dict_comprehension.html
@@ -164,7 +164,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/ensure_dir.html b/python/ensure_dir.html
index 33e1000..88907bc 100644
--- a/python/ensure_dir.html
+++ b/python/ensure_dir.html
@@ -177,7 +177,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/list_files_directory.html b/python/list_files_directory.html
index 56b6242..4a72158 100644
--- a/python/list_files_directory.html
+++ b/python/list_files_directory.html
@@ -213,7 +213,7 @@
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/reverse.html b/python/reverse.html
index c641f83..e28e622 100644
--- a/python/reverse.html
+++ b/python/reverse.html
@@ -173,7 +173,7 @@ Reversed array : [4 3 2 1 0]
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/sorting.html b/python/sorting.html
index 005f35f..c778510 100644
--- a/python/sorting.html
+++ b/python/sorting.html
@@ -192,7 +192,7 @@ Sorted array : [0.13876208 0.19939047 0.40021786 0.43734158 0.46015169]
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.
diff --git a/python/unique.html b/python/unique.html
index d3d789b..fc65dd8 100644
--- a/python/unique.html
+++ b/python/unique.html
@@ -171,7 +171,7 @@ Numpy array with unique values : [10 20 30 40 50 60]
     <footer class="footer">
         <div class="container">
             <p class="text-muted">
-                <center>This project contains 45 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 46 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>.