{"id":21446,"date":"2021-09-22T17:36:49","date_gmt":"2021-09-22T12:06:49","guid":{"rendered":"https:\/\/python-programs.com\/?p=21446"},"modified":"2021-11-22T18:35:42","modified_gmt":"2021-11-22T13:05:42","slug":"python-program-to-find-sum-of-all-even-frequency-elements-in-matrix","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-program-to-find-sum-of-all-even-frequency-elements-in-matrix\/","title":{"rendered":"Python Program to Find Sum of all Even Frequency Elements in Matrix"},"content":{"rendered":"<p>In the previous article, we have discussed <a href=\"https:\/\/python-programs.com\/python-program-to-find-elements-larger-than-half-of-the-elements-in-an-array-list\/\">Python Program to Find Elements Larger than Half of the Elements in an Array\/List<\/a><\/p>\n<p>Given a matrix, the task is to find the sum of all r Frequency elements of the given Matrix in Python.<\/p>\n<p><strong>What is a matrix:<\/strong><\/p>\n<p>A matrix is a rectangular sequence of numbers divided into columns and rows. A matrix element or entry is a number that appears in a matrix.<\/p>\n<p><strong>Example:<\/strong><\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-7021 aligncenter\" src=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/matrix.jpg\" alt=\"\" width=\"561\" height=\"426\" srcset=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/matrix.jpg 561w, https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/matrix-300x228.jpg 300w\" sizes=\"(max-width: 561px) 100vw, 561px\" \/><\/p>\n<p>Above is the matrix which contains 5 rows and 4 columns and having elements from 1 to 20.<\/p>\n<p>In this order, the dimensions of a matrix indicate the number of rows and columns.<\/p>\n<div class=\"google-auto-placed ap_container\">Here as there are 5 rows and 4 columns it is called a 5*4 matrix.<\/div>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Example1:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given Matrix : \r\n1 2 2\r\n3 4 2\r\n5 1 5<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The sum of all the even frequency elements in the given matrix is = { 6 }<\/pre>\n<p><strong>Explanation:<\/strong><\/p>\n<pre>Here the even Frequency elements in the given matrix are 1,5 so sum=1+5=6<\/pre>\n<p><strong>Example2:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given Matrix : \r\n2 2 3 3\r\n1 7 8 3\r\n8 9 1 7\r\n5 6 7 8<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>The sum of all the even frequency elements in the given matrix is = { 3 }<\/pre>\n<h2>Program to Find Sum of all Even Frequency Elements in Matrix in Python<\/h2>\n<p>Below are the ways to find the sum of all the even Frequency elements of the given Matrix in Python.<\/p>\n<ul>\n<li><a href=\"#Using_Counter()_function_(Hashing,_User_Input)\">Using Counter() function (Hashing, User Input)<\/a><\/li>\n<li><a href=\"#Using_Counter()_function_(Hashing,_User_Input)\">Using Counter() function (Hashing, User Input)<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_Counter()_function_(Hashing,_User_Input)\">Method #1: Using Counter() function (Hashing, Static Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the Counter Function from collections using the import keyword.<\/li>\n<li>Give the matrix as static input and store it in a variable.<\/li>\n<li>Calculate the number of rows of the given matrix by calculating the length of the nested list using the len() function and store it in a variable mtrxrows.<\/li>\n<li>Calculate the number of columns of the given matrix by calculating the length of the first list in the nested list using the len() function and store it in a variable mtrxcolums.<\/li>\n<li>Take a list and initialize it to empty using [] or list() function.<\/li>\n<li>Loop till the given number of rows using the For loop.<\/li>\n<li>Inside the For loop, Iterate till the given number of columns using another Nested For loop(Inner For loop).<\/li>\n<li>Add the gvnmatrix[n][m] value to the list using the append() function where n is the iterator value of the parent For loop and m is the iterator\u00a0value of the inner For loop.<\/li>\n<li>Apply the Counter function to the matrix elements list which stores the matrix element as key and its frequency as value<\/li>\n<li>Take a variable(say <strong>evenFreqSum<\/strong>) that stores the sum of all the even frequency elements of the matrix and initialize its value to 0.<\/li>\n<li>Loop in this frequency dictionary using the For loop.<\/li>\n<li>Check if any key has frequency even using the if conditional statement.<\/li>\n<li>If it is true then add the key(Matrix Element) to the\u00a0<strong>evenFreqSum.<\/strong><\/li>\n<li>Print the\u00a0<strong>evenFreqSum.<\/strong><\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># import the Counter Function from collections using the import keyword\r\nfrom collections import Counter\r\n# Give the matrix as static input and store it in a variable.\r\nmtrx = [[1, 2, 2], [3, 4, 2], [5, 1, 5]]\r\n# Calculate the number of rows of the given matrix by\r\n# calculating the length of the nested list using the len() function\r\n# and store it in a variable mtrxrows.\r\nmtrxrows = len(mtrx)\r\n# Calculate the number of columns of the given matrix by\r\n# calculating the length of the first list in the nested list\r\n# using the len() function and store it in a variable mtrxcols.\r\nmtrxcols = len(mtrx[0])\r\n# take a list and initialize it to empty using [] or list() function\r\nmtrxlist = []\r\n# Loop till the given number of rows using the For loop.\r\nfor n in range(mtrxrows):\r\n    # Inside the For loop, Iterate till the given number of columns using another\r\n    # Nested For loop(Inner For loop).\r\n    for m in range(mtrxcols):\r\n        # add the gvnmatrix[n][m] value to the list using the append() function\r\n        # where n is the iterator value of the parent For loop and m is the iterator\r\n        # value of the inner For loop.\r\n        mtrxlist.append(mtrx[n][m])\r\n# Apply the Counter function to the matrix elements list which stores the matrix element\r\n# as key and its frequency as value\r\nmtrxfreq = Counter(mtrxlist)\r\n# Take a variable(say evenFreqSum) that stores the sum of all the even frequency elements\r\n# of the matrix and initialize its value to 0.\r\nevenFreqSum = 0\r\n# Loop in this frequency dictionary using the For loop.\r\nfor key in mtrxfreq:\r\n    # Check if any key has frequency even using the if conditional statement.\r\n    if(mtrxfreq[key] % 2 == 0):\r\n        # If it is true then add the key(Matrix Element) to the\u00a0evenFreqSum.\r\n        evenFreqSum = evenFreqSum+key\r\n# Print the\u00a0evenFreqSum.\r\nprint(\r\n    'The sum of all the even frequency elements in the given matrix is = {', evenFreqSum, '}')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The sum of all the even frequency elements in the given matrix is = { 6 }<\/pre>\n<h3 id=\"Using_Counter()_function_(Hashing,_User_Input)\">Method #2: Using Counter() function (Hashing, User Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the Counter Function from collections using the import keyword.<\/li>\n<li>Give the number of rows of the matrix as user input using the int(input()) function and store it in a variable.<\/li>\n<li>Give the number of columns of the matrix as user input using the int(input()) function and store it in another variable.<\/li>\n<li>Take a list and initialize it with an empty value using [] or list() to say\u00a0<strong>gvnmatrix<\/strong>.<\/li>\n<li>Loop till the given number of rows using the For loop<\/li>\n<li>Inside the For loop, Give all the row elements of the given Matrix as a list using the list(),map(),int(),split() functions and store it in a variable.<\/li>\n<li>Add the above row elements list to\u00a0<strong>gvnmatrix<\/strong>\u00a0using the append() function.<\/li>\n<li>Take a list and initialize it to empty using [] or list() function.<\/li>\n<li>Loop till the given number of rows using the For loop.<\/li>\n<li>Inside the For loop, Iterate till the given number of columns using another Nested For loop(Inner For loop).<\/li>\n<li>Add the gvnmatrix[n][m] value to the list using the append() function where n is the iterator value of the parent For loop and m is the iterator\u00a0value of the inner For loop.<\/li>\n<li>Apply the Counter function to the matrix elements list which stores the matrix element as key and its frequency as value<\/li>\n<li>Take a variable(say <strong>evenFreqSum<\/strong>) that stores the sum of all the even frequency elements of the matrix and initialize its value to 0.<\/li>\n<li>Loop in this frequency dictionary using the For loop.<\/li>\n<li>Check if any key has frequency even using the if conditional statement.<\/li>\n<li>If it is true then add the key(Matrix Element) to the\u00a0<strong>evenFreqSum.<\/strong><\/li>\n<li>Print the\u00a0<strong>evenFreqSum.<\/strong><\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># import the Counter Function from collections using the import keyword\r\nfrom collections import Counter\r\n# Give the number of rows of the matrix as user input using the int(input()) function\r\n# and store it in a variable.\r\nmtrxrows = int(input('Enter some random number of rows of the matrix = '))\r\n# Give the number of columns of the matrix as user input using the int(input()) function\r\n# and store it in another variable.\r\nmtrxcols = int(input('Enter some random number of columns of the matrix = '))\r\n# Take a list and initialize it with an empty value using [] or list() to say gvnmatrix.\r\nmtrx = []\r\n# Loop till the given number of rows using the For loop\r\nfor n in range(mtrxrows):\r\n    # Inside the For loop, Give all the row elements of the given Matrix as a list using\r\n    # the list(),map(),int(),split() functions and store it in a variable.\r\n    l = list(map(int, input(\r\n        'Enter {'+str(mtrxcols)+'} elements of row {'+str(n+1)+'} separated by spaces = ').split()))\r\n    # Add the above row elements list to gvnmatrix using the append() function.\r\n    mtrx.append(l)\r\n\r\n# take a list and initialize it to empty using [] or list() function\r\nmtrxlist = []\r\n# Loop till the given number of rows using the For loop.\r\nfor n in range(mtrxrows):\r\n    # Inside the For loop, Iterate till the given number of columns using another\r\n    # Nested For loop(Inner For loop).\r\n    for m in range(mtrxcols):\r\n        # add the gvnmatrix[n][m] value to the list using the append() function\r\n        # where n is the iterator value of the parent For loop and m is the iterator\r\n        # value of the inner For loop.\r\n        mtrxlist.append(mtrx[n][m])\r\n# Apply the Counter function to the matrix elements list which stores the matrix element\r\n# as key and its frequency as value\r\nmtrxfreq = Counter(mtrxlist)\r\n# Take a variable(say evenFreqSum) that stores the sum of all the even frequency elements\r\n# of the matrix and initialize its value to 0.\r\nevenFreqSum = 0\r\n# Loop in this frequency dictionary using the For loop.\r\nfor key in mtrxfreq:\r\n    # Check if any key has frequency even using the if conditional statement.\r\n    if(mtrxfreq[key] % 2 == 0):\r\n        # If it is true then add the key(Matrix Element) to the\u00a0evenFreqSum.\r\n        evenFreqSum = evenFreqSum+key\r\n# Print the\u00a0evenFreqSum.\r\nprint(\r\n    'The sum of all the even frequency elements in the given matrix is = {', evenFreqSum, '}')\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Enter some random number of rows of the matrix = 4\r\nEnter some random number of columns of the matrix = 4\r\nEnter {4} elements of row {1} separated by spaces = 2 2 3 3\r\nEnter {4} elements of row {2} separated by spaces = 1 7 8 3\r\nEnter {4} elements of row {3} separated by spaces = 8 9 1 7\r\nEnter {4} elements of row {4} separated by spaces = 5 6 7 8\r\nThe sum of all the even frequency elements in the given matrix is = { 3 }<\/pre>\n<p>If you are learning Python then the <a href=\"https:\/\/python-programs.com\/python-programming-examples-with-output\/\">Python Programming Example<\/a> is for you and gives you a thorough description of concepts for beginners, experienced programmers.<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-remove-elements-from-the-array-list-which-occurs-more-than-k-times\/\">Python Program to Remove Elements from the Array\/List Which Occurs More than k Times<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-remove-string-elements-that-appear-strictly-less-than-k-times\/\">Python Program to Remove String Elements that Appear Strictly Less than k Times<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-for-array-list-elements-that-appear-more-than-once\/\">Python Program for Array\/List Elements that Appear More than Once<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-remove-elements-from-the-array-list-which-appear-strictly-less-than-k-times\/\">Python Program to Remove Elements from the Array\/List Which Appear Strictly Less than k Times<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In the previous article, we have discussed Python Program to Find Elements Larger than Half of the Elements in an Array\/List Given a matrix, the task is to find the sum of all r Frequency elements of the given Matrix in Python. 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