{"id":4835,"date":"2023-10-28T15:16:25","date_gmt":"2023-10-28T09:46:25","guid":{"rendered":"https:\/\/python-programs.com\/?p=4835"},"modified":"2023-11-10T12:04:19","modified_gmt":"2023-11-10T06:34:19","slug":"count-occurrences-of-a-value-in-numpy-array-in-python","status":"publish","type":"post","link":"https:\/\/python-programs.com\/count-occurrences-of-a-value-in-numpy-array-in-python\/","title":{"rendered":"Count occurrences of a value in NumPy array in Python | numpy.count() in Python"},"content":{"rendered":"<p><strong>Count Occurences of a Value in Numpy Array in Python:<\/strong> In this article, we have seen different methods to count the number of occurrences of a value in a NumPy array in Python. Check out the below given direct links and gain the information about Count occurrences of a value in a NumPy array in Python.<\/p>\n<ul>\n<li><a href=\"#numpy.count()_Function_in_Python\">numpy.count() Function in Python<\/a><\/li>\n<li><a href=\"#Example_Code_for_Python_numpy.count()_Function\">Example Code for Python numpy.count() Function<\/a><\/li>\n<li><a href=\"#How_to_count_the_occurrences_of_a_value_in_a_NumPy_array_in_Python?\">How to count the occurrences of a value in a NumPy array in Python?<\/a><\/li>\n<li><a href=\"#Use_count_nonzero()\">Use count_nonzero()<\/a><\/li>\n<li><a href=\"#Use_sum()\">Use sum()<\/a><\/li>\n<li><a href=\"#Use_bincount()\">Use bincount()<\/a><\/li>\n<li><a href=\"#Convert_numpy_array_to_list_and_count_occurrences_of_a_value_in_an_array\">Convert numpy array to list and count occurrences of a value in an array<\/a><\/li>\n<li><a href=\"#Select_elements_from_the_array_that_matches_the_value_and_count_them\">Select elements from the array that matches the value and count them<\/a><\/li>\n<li><a href=\"#Count_occurrences_of_a_value_in_2D_NumPy_Array\">Count occurrences of a value in 2D NumPy Array<\/a><\/li>\n<li><a href=\"#Count_occurrences_of_a_value_in_each_row_of_2D_NumPy_Array\">Count occurrences of a value in each row of 2D NumPy Array<\/a><\/li>\n<li><a href=\"#Count_occurrences_of_a_value_in_each_column_of_2D_NumPy_Array\">Count occurrences of a value in each column of 2D NumPy Array<\/a><\/li>\n<\/ul>\n<h2><a id=\"numpy.count()_Function_in_Python\"><\/a>Python numpy.count() Function<\/h2>\n<p>The function of <code>numpy.count()<\/code>in python aid in the counts for the non-overlapping occurrence of sub-string in the specified range. The syntax for phyton numpy.count() function is as follows:<\/p>\n<h3>Syntax:<\/h3>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">numpy.core.defchararray.count(arr, substring, start=0, end=None)<\/code><\/p>\n<h3>Parameters:<\/h3>\n<ul>\n<li><em><strong>arr:<\/strong><\/em> array-like or string to be searched.<\/li>\n<li><em><strong>substring:<\/strong><\/em> substring to search for.<\/li>\n<li><em><strong>start, end:<\/strong> <\/em>[int, optional] Range to search in.<\/li>\n<\/ul>\n<h3>Returns:<\/h3>\n<p>An integer array with the number of non-overlapping occurrences of the substring.<\/p>\n<h2><a id=\"Example_Code_for_Python_numpy.count()_Function\"><\/a>Example Code for numpy.count() Function in Python<\/h2>\n<p><img loading=\"lazy\" class=\"aligncenter wp-image-17759\" src=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/numpy.count-function-in-python-300x180.png\" alt=\"numpy.count() function in python\" width=\"640\" height=\"384\" srcset=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/numpy.count-function-in-python-300x180.png 300w, https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/numpy.count-function-in-python-768x460.png 768w, https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/numpy.count-function-in-python.png 791w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Python Program illustrating \r\n# numpy.char.count() method \r\nimport numpy as np \r\n  \r\n# 2D array \r\narr = ['vdsdsttetteteAAAa', 'AAAAAAAaattttds', 'AAaaxxxxtt', 'AAaaXDSDdscz']\r\n  \r\nprint (\"arr : \", arr)\r\n  \r\nprint (\"Count of 'Aa'\", np.char.count(arr, 'Aa'))\r\nprint (\"Count of 'Aa'\", np.char.count(arr, 'Aa', start = 8))<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>arr : ['vdsdsttetteteAAAa', 'AAAAAAAaattttds', 'AAaaxxxxtt', 'AAaaXDSDdscz']\r\n\r\nCount of 'Aa' [1 1 1 1]\r\nCount of 'Aa' [1 0 0 0]<\/pre>\n<p><span style=\"color: #ff6600;\">Also Check:<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/how-to-sort-a-numpy-array-in-python\/\">How to sort a Numpy Array in Python?<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/numpy-amin-find-minimum-value-in-numpy-array-and-its-index\/\">numpy.amin() | Find minimum value in Numpy Array and it\u2019s index<\/a><\/li>\n<\/ul>\n<h2><a id=\"How_to_count_the_occurrences_of_a_value_in_a_NumPy_array_in_Python?\"><\/a>How to count the occurrences of a value in a NumPy array in Python<\/h2>\n<p>Counting the occurrences of a value in a NumPy array means returns the frequency of the value in the array. Here are the various methods used to count the occurrences of a value in a python numpy array.<\/p>\n<h3><a id=\"Use_count_nonzero()\"><\/a>Use count_nonzero()<\/h3>\n<p>We use the <code>count_nonzero()<\/code>function to count occurrences of a value in a NumPy array, which returns the count of values in a given numpy array. If the value of the axis argument is None, then it returns the count.<\/p>\n<p>Let&#8217;s take an example, count all occurrences of value \u20186\u2019 in an array,<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import numpy as np\r\narr = np.array([9, 6, 7, 5, 6, 4, 5, 6, 5, 4, 7, 8, 6, 6, 7])\r\nprint('Numpy Array:')\r\nprint(arr)\r\n# Count occurrence of element '3' in numpy array\r\ncount = np.count_nonzero(arr == 6)\r\nprint('Total occurences of \"6\" in array: ', count)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>RESTART: C:\/Users\/HP\/Desktop\/article3.py\r\nNumpy Array:\r\n[9 6 7 5 6 4 5 6 5 4 7 8 6 6 7]\r\nTotal occurences of \"6\" in array: 5\r\n\r\n<\/pre>\n<p>In the above example, you have seen that we applied a condition to the numpy array ie., arr==6, then it applies the condition on each element of the array and stores the result as a bool value in a new array.<\/p>\n<h3><a id=\"Use_sum()\"><\/a>Use sum()<\/h3>\n<p>In this, we are using the<code>sum()<\/code>function to count occurrences of a value in an array.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\narr = np.array([9, 6, 7, 5, 6, 4, 5, 6, 5, 4, 7, 8, 6, 6, 7])\r\nprint('Numpy Array:')\r\nprint(arr)\r\n# Count occurrence of element '6' in numpy array\r\ncount = (arr == 6).sum()\r\n\r\nprint('Total occurences of \"6\" in array: ', count)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>RESTART: C:\/Users\/HP\/Desktop\/article3.py\r\nNumpy Array: [9 6 7 5 6 4 5 6 5 4 7 8 6 6 7]\r\nTotal occurences of \"6\" in array: 5\r\n<\/pre>\n<p>In the above example, we have seen if the given condition is true then it is equivalent to one in python so we can add the True values in the array to get the sum of values in the array.<\/p>\n<h3><a id=\"Use_bincount()\"><\/a>Use bincount()<\/h3>\n<p>We use<code>bincount()<\/code>function to count occurrences of a value in an array.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\narr = np.array([9, 6, 7, 5, 6, 4, 5, 6, 5, 4, 7, 8, 6, 6, 7])\r\ncount_arr = np.bincount(arr)\r\n# Count occurrence of element '6' in numpy array\r\nprint('Total occurences of \"6\" in array: ', count_arr[6])\r\n# Count occurrence of element '5' in numpy array\r\nprint('Total occurences of \"5\" in array: ', count_arr[5])<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>RESTART: C:\/Users\/HP\/Desktop\/article3.py\r\nTotal occurences of \"6\" in array: 5\r\nTotal occurences of \"5\" in array: 3\r\n<\/pre>\n<h3><a id=\"Convert_numpy_array_to_list_and_count_occurrences_of_a_value_in_an_array\"><\/a>Convert numpy array to list and count occurrences of a value in an array<\/h3>\n<p>In this method, first we convert the array to a list and then we apply<code>count()<\/code>function on the list to get the count of occurrences of an element.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import numpy as np\r\narr = np.array([9, 6, 7, 5, 6, 4, 5, 6, 5, 4, 7, 8, 6, 6, 7])\r\n# Count occurrence of element '6' in numpy array\r\ncount = arr.tolist().count(6)\r\nprint('Total occurences of \"6\" in array: ', count)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>RESTART: C:\/Users\/HP\/Desktop\/article3.py\r\nTotal occurences of \"6\" in array:<\/pre>\n<h3><a id=\"Select_elements_from_the_array_that_matches_the_value_and_count_them\"><\/a>Select elements from the array that matches the value and count them<\/h3>\n<p>We can choose only those elements from the numpy array that is similar to a presented value and then we can attain the length of this new array. It will furnish the count of occurrences of the value in the original array. For instance,<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import numpy as np\r\n# Create a 2D Numpy Array from list of lists\r\nmatrix = np.array( [[2, 3, 4],\r\n                    [5, 3, 4],\r\n                    [5, 3, 5],\r\n                    [4, 7, 8],\r\n                    [3, 6, 2]] )\r\n# Count occurrence of element '3' in each column\r\ncount = np.count_nonzero(matrix == 3, axis=0)\r\nprint('Total occurrences  of \"3\" in each column of 2D array: ', count)<\/pre>\n<p><strong>Output:\u00a0<\/strong><\/p>\n<pre>Total occurrences of \"3\" in each column of 2D array: [1 3 0]<\/pre>\n<h3><a id=\"Count_occurrences_of_a_value_in_2D_NumPy_Array\"><\/a>Count occurrences of a value in 2D NumPy Array<\/h3>\n<p>We can use the count_nonzero() function to count the occurrences of a value in a 2D array or matrix.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import numpy as np\r\n# Create a 2D Numpy Array from list of lists\r\nmatrix = np.array( [[2, 3, 4],\r\n                    [5, 3, 4],\r\n                    [5, 6, 5],\r\n                    [6, 7, 6],\r\n                    [3, 6, 2]] )\r\n# Count occurrence of element '6' in complete 2D Numpy Array\r\ncount = np.count_nonzero(matrix == 6)\r\nprint('Total occurrences of \"6\" in 2D array:')\r\nprint(count)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Total occurrences of \"6\" in 2D array: 4<\/pre>\n<h3><a id=\"Count_occurrences_of_a_value_in_each_row_of_2D_NumPy_Array\"><\/a>Count occurrences of a value in each row of 2D NumPy Array<\/h3>\n<p>To count the occurrences of a value in each row of the 2D\u00a0 array we will pass the axis value as 1 in the count_nonzero() function.<\/p>\n<p>It will return an array containing the count of occurrences of a value in each row.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\n# Create a 2D Numpy Array from list of lists\r\nmatrix = np.array( [[2, 3, 4],\r\n                    [5, 3, 4],\r\n                    [6, 6, 5],\r\n                    [4, 7, 6],\r\n                    [3, 6, 2]] )\r\n# Count occurrence of element '6' in each row\r\ncount = np.count_nonzero(matrix == 6, axis=1)\r\nprint('Total occurrences  of \"6\" in each row of 2D array: ', count)\r\n\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Total occurrences of \"6\" in each row of 2D array: [0 0 2 1 1]\r\n<\/pre>\n<h3><a id=\"Count_occurrences_of_a_value_in_each_column_of_2D_NumPy_Array\"><\/a>Count occurrences of a value in each column of 2D NumPy Array<\/h3>\n<p>In order to count the occurrences of a value in each column of the 2D NumPy array transfer the axis value as 0 in the<code>count_nonzero()<\/code>function. After that, it will result in an array including the count of occurrences of a value in each column. For instance,<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import numpy as np\r\n# Create a 2D Numpy Array from list of lists\r\nmatrix = np.array( [[2, 3, 4],\r\n                    [5, 3, 4],\r\n                    [5, 3, 5],\r\n                    [4, 7, 8],\r\n                    [3, 6, 2]] )\r\n# Count occurrence of element '3' in each column\r\ncount = np.count_nonzero(matrix == 3, axis=0)\r\nprint('Total occurrences  of \"3\" in each column of 2D array: ', count)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Total occurrences of \"3\" in each column of 2D array: [1 3 0]<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Count Occurences of a Value in Numpy Array in Python: In this article, we have seen different methods to count the number of occurrences of a value in a NumPy array in Python. 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