{"id":4753,"date":"2020-10-25T09:53:55","date_gmt":"2020-10-25T04:23:55","guid":{"rendered":"http:\/\/www.pythonpool.com\/?p=4753"},"modified":"2021-06-14T15:00:20","modified_gmt":"2021-06-14T09:30:20","slug":"numpy-count","status":"publish","type":"post","link":"https:\/\/www.pythonpool.com\/numpy-count\/","title":{"rendered":"Numpy Count | Practical Explanation of Occurrence Finder"},"content":{"rendered":"\n<p>Numpy one of the best and most widely used modules.Because it makes the computation easy and simple with faster speed. Similarly, we have a <strong>numpy count<\/strong>, a method to find a substring occurrence in a given array or list. This is easy to use, and simple is working. But like Numpy, the behind the scenes things are complex.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #990303;color:#990303\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #990303;color:#990303\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#What_is_Numpy_Count\" >What is Numpy Count?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#Syntax_of_Numpy_Count\" >Syntax of Numpy Count<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#Parameters_of_Numpy_Count\" >Parameters of Numpy Count<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#Return_Value\" >Return Value<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#Examples_of_Numpy_Count\" >Examples of Numpy Count<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#Strcount_vs_Numpy_Count\" >Str.count vs Numpy Count<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#numpycount_nonzero\" >numpy.count_nonzero<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#Whats_Next\" >What\u2019s Next?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-what-is-numpy-count\"><span class=\"ez-toc-section\" id=\"What_is_Numpy_Count\"><\/span>What is Numpy Count?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The actual function is num.char.count(). So the syntax changes a little. But function work remains the same: to find the count of occurrence of a particular string. That, too, from a given list of words without overlapping the occurrence in each word of the list.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-syntax-of-numpy-count\"><span class=\"ez-toc-section\" id=\"Syntax_of_Numpy_Count\"><\/span>Syntax of Numpy Count<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The following is the syntax of using numpy count function:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>numpy.core.defchararray.count(arr, substring, start=0, end=None)<\/code><\/pre>\n\n\n\n<p><strong>While the usual way of writing it is : <\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>np.char.count(array, substring)<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-parameters-of-numpy-count\"><span class=\"ez-toc-section\" id=\"Parameters_of_Numpy_Count\"><\/span>Parameters of Numpy Count<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Parameter<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Mandatory or Not<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">arr<\/td><td class=\"has-text-align-center\" data-align=\"center\">Mandatory<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">substring<\/td><td class=\"has-text-align-center\" data-align=\"center\">Mandatory<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">start<\/td><td class=\"has-text-align-center\" data-align=\"center\">optional<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">end<\/td><td class=\"has-text-align-center\" data-align=\"center\">optional<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-arr-array\"><strong>arr : array<\/strong><\/h3>\n\n\n\n<p>arr or (array) is the base of our function. Because this parameter provides the list of strings. While it is a ndarray, it is easily traversed by function. And the count is done for each string separately. The data type used is either array-like or string only.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-substring\"><strong>substring<\/strong><\/h3>\n\n\n\n<p>substring tells the combination of the characters to be searched in the array provided. That is to say, it is mandatory to be used. The function considers all the characters as one. So it becomes easier to traverse and count. The data type used should be str or Unicode.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-start-end\"><strong>start \/ end<\/strong><\/h3>\n\n\n\n<p>They define the boundaries of search. Because they are the positions of search in a string. They are optional to use and usually not used. They have an int data type. Start and end both are used individually as per the demand. While the position by the end is not included, the start is included. The limits they make are for each string irrespective of others.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-return-value\"><span class=\"ez-toc-section\" id=\"Return_Value\"><\/span>Return Value<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>As per the <a rel=\"noreferrer noopener nofollow\" href=\"https:\/\/numpy.org\/doc\/stable\/reference\/generated\/numpy.char.count.html?highlight=numpy%20count#numpy.char.count\" target=\"_blank\">numpy.org, <\/a>This&nbsp;function returns an array. That contains the number of non-overlapping occurrences of substring sub in the range [start, end]. In other words, An integer array with the number of non-overlapping occurrences of the substring<strong>.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-examples-of-numpy-count\"><span class=\"ez-toc-section\" id=\"Examples_of_Numpy_Count\"><\/span>Examples of Numpy Count<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Before we start coding we need to import the module &#8211; numpy:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nimport numpy as np\n<\/pre><\/div>\n\n\n<p>Now we are ready to code. So we create an array:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\narr = np.array(&#x5B;'ahhert','bhherta','hhertab','jhahhertb'])\narr\narray(&#x5B;'ahhert', 'bahherta', 'hhertab', 'jhahhertb'], dtype='&lt;U9')\n<\/pre><\/div>\n\n\n<p>Now we use the function on it:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nnp.char.count(arr,'hhe')\narray(&#x5B;1, 1, 1, 1])\nnp.char.count(arr,'ab')\narray(&#x5B;0, 0, 1, 0])\n<\/pre><\/div>\n\n\n<p>Here, we searched two different substrings without defining limits. And the result shows the working. There are four strings and in each, we have &#8216;hhe&#8217; only once. While there were more &#8216;h&#8217; it only considered the combined ones. The same goes for the second example, &#8216;ab&#8217; occur together twice. But only once is &#8216;b&#8217; after &#8216;a&#8217;.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\nnp.char.count(arr,'h',2)\narray(&#x5B;1, 2, 0, 2])\nnp.char.count(arr,'b',start=2)\narray(&#x5B;0, 0, 1, 1])\nnp.char.count(arr,'a',end=4)\narray(&#x5B;1, 0, 0, 1])\nnp.char.count(arr,'a',3,7)\narray(&#x5B;0, 0, 1, 0])\nnp.char.count(arr,'h',start=3,end=6)\narray(&#x5B;0, 1, 0, 2])\n<\/pre><\/div>\n\n\n<p>Here, you can see the start and end can be used individually. And even without using the word start and end, we can assign positions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-str-count-vs-numpy-count\"><span class=\"ez-toc-section\" id=\"Strcount_vs_Numpy_Count\"><\/span>Str.count vs Numpy Count<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The count is used in one more way in basic python as string.count(). As per W3schools, The method returns the number of times a specified value appears in the string. That is similar to numpy count but a little different.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: python; title: ; notranslate\" title=\"\">\narr.count('hh')\nTraceback (most recent call last):\n  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;\nAttributeError: 'numpy.ndarray' object has no attribute 'count'\na = ' i love to play football'\na.count('pla')\n1\na.count('o')\n4\n<\/pre><\/div>\n\n\n<p>If we use count directly it gives a traceback error. Because &#8216;arr&#8217; is an N-dimensional array with multiple string array. While if we use a simple string like &#8216;a&#8217;, it gives similar results. So in numpy count function is called for each string separately and rest is same<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-numpy-count_nonzero\"><span class=\"ez-toc-section\" id=\"numpycount_nonzero\"><\/span>numpy.count_nonzero<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>When you search for numpy count, you may get this function as well. This Counts the number of non-zero values in the array\u00a0<code>a<\/code>. With the syntax: <code><a href=\"http:\/\/www.pythonpool.com\/numpy-count_nonzero\/\" target=\"_blank\" rel=\"noreferrer noopener\">numpy.count_nonzero<\/a><\/code><strong>(<\/strong><em>a<\/em><strong>,\u00a0<\/strong><em>axis=None<\/em><strong>,\u00a0<\/strong><em>*<\/em><strong>,\u00a0<\/strong><em>keepdims=False<\/em>)<\/p>\n\n\n\n<p>It counts the number of <a href=\"http:\/\/www.pythonpool.com\/numpy-count_nonzero\/\" target=\"_blank\" rel=\"noreferrer noopener\">nonzero<\/a> values in an N-dimensional array. Without an axis, it tells for the whole array. With axis, it tells results as a row or column.<\/p>\n\n\n\n<p class=\"has-white-color has-luminous-vivid-orange-background-color has-text-color has-background\"><strong>Read more<\/strong> >> <a href=\"http:\/\/www.pythonpool.com\/numpy-count_nonzero\/\"><em><span class=\"has-inline-color has-white-color\"><span style=\"text-decoration: underline;\">4 Examples to Use Numpy count_nonzero() Function<\/span><\/span><\/em><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-s-next\"><span class=\"ez-toc-section\" id=\"Whats_Next\"><\/span><strong>What\u2019s Next?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>NumPy is very powerful and incredibly essential for information science in Python. That being true, if you are interested in <a href=\"http:\/\/www.pythonpool.com\/data-science-internship\/\" >data science<\/a> in Python, you really ought to find out more about Python.<\/p>\n\n\n\n<p>You might like our following tutorials on numpy.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"http:\/\/www.pythonpool.com\/numpy-mean\/\">Mean: Implementation and Importance<\/a><\/li><li><a href=\"http:\/\/www.pythonpool.com\/numpy-random\/\">Using&nbsp;<\/a><a href=\"http:\/\/www.pythonpool.com\/numpy-random\/\">Random Function to Create Random Data<\/a><\/li><li><a href=\"http:\/\/www.pythonpool.com\/numpy-reshape\/\">Reshape: Reshaping Arrays With Ease<\/a><\/li><li><a href=\"http:\/\/www.pythonpool.com\/numpy-power\/\">In-depth Explanation of np.power() With Examples<\/a><\/li><li><a href=\"http:\/\/www.pythonpool.com\/numpy-clip\/\">Clip Function<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In conclusion, we can say that <a href=\"http:\/\/www.pythonpool.com\/category\/numpy\/\" target=\"_blank\" rel=\"noreferrer noopener\">numpy<\/a> count is commonly used and easily understood. So everyone can use it with comfort and make the computation easier. <\/p>\n\n\n\n<p>Still have any doubts or questions do let me know in the comment section below. I will try to help you as soon as possible.<\/p>\n\n\n\n<p><strong><em>Happy Pythoning!<\/em><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Numpy one of the best and most widely used modules.Because it makes the computation easy and simple with faster speed. Similarly, we have a numpy &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Numpy Count | Practical Explanation of Occurrence Finder\" class=\"read-more button\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/#more-4753\" aria-label=\"More on Numpy Count | Practical Explanation of Occurrence Finder\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":4805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1495],"tags":[2372,2371,2367,2362,2370,2365,2369,2360,2363,2366,2358,2359],"class_list":["post-4753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-numpy","tag-count-numpy","tag-numpy-array-count","tag-numpy-count","tag-numpy-count-function","tag-numpy-count-nonzero","tag-numpy-count-occurrences","tag-numpy-count-true","tag-numpy-count-unique","tag-numpy-count-values","tag-numpy-count-zero","tag-numpy-count-zeros","tag-python-count-occurrences-in-numpy-array","infinite-scroll-item"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.1 (Yoast SEO v25.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Numpy Count | Practical Explanation of Occurrence Finder - Python Pool<\/title>\n<meta name=\"description\" content=\"numpy count, a method to find a substring occurrence in a given array or list. numpy count is easy to use, and simple is working.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pythonpool.com\/numpy-count\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Numpy Count | Practical Explanation of Occurrence Finder\" \/>\n<meta property=\"og:description\" content=\"Numpy one of the best and most widely used modules.Because it makes the computation easy and simple with faster speed. 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