{"id":5209,"date":"2023-10-28T16:27:36","date_gmt":"2023-10-28T10:57:36","guid":{"rendered":"https:\/\/python-programs.com\/?p=5209"},"modified":"2023-11-10T12:04:09","modified_gmt":"2023-11-10T06:34:09","slug":"sorting-2d-numpy-array-by-column-or-row-in-python","status":"publish","type":"post","link":"https:\/\/python-programs.com\/sorting-2d-numpy-array-by-column-or-row-in-python\/","title":{"rendered":"Sorting 2D Numpy Array by column or row in Python | How to sort the\u00a0NumPy array by column or row in Python?"},"content":{"rendered":"<p>In this tutorial, we are going to discuss how to sort the NumPy array by column or row in Python. Just click on the direct links available here and directly jump into the example codes on sorting 2D Numpy Array by Column or Row in Python.<\/p>\n<ul>\n<li><a href=\"#How_to_Sort_the_NumPy_array_by_Column_in_Python?\">How to Sort the NumPy array by Column in Python?<\/a>\n<ul>\n<li><a href=\"#Sorting_2D_Numpy_Array_by_column_at_index_1\">Sorting 2D Numpy Array by column at index 1<\/a><\/li>\n<li><a href=\"#Sorting_2D_Numpy_Array_by_column_at_index_0\">Sorting 2D Numpy Array by column at index 0<\/a><\/li>\n<li><a href=\"#Sorting_2D_Numpy_Array_by_the_Last_Column\">Sorting 2D Numpy Array by the Last Column<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#How_to_Sort_the_NumPy_array_by_Row_in_Python?\">How to Sort the NumPy array by Row in Python?<\/a>\n<ul>\n<li><a href=\"#Sorting_2D_Numpy_Array_by_row_at_index_position_1\">Sorting 2D Numpy Array by row at index position 1<\/a><\/li>\n<li><a href=\"#Sorting_2D_Numpy_Array_by_the_Last_Row\">Sorting 2D Numpy Array by the Last Row<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><a id=\"How_to_Sort_the_NumPy_array_by_Column_in_Python?\"><\/a>How to Sort the NumPy Array by Column in Python?<\/h2>\n<p>In this section, you will be learning the concept of Sorting 2D Numpy Array by a column<\/p>\n<p>Firstly, we have to import a numpy module ie.,<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import numpy as np<\/code><\/p>\n<p>After that, create a 2D Numpy array i.e.,<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Create a 2D Numpy array list of list\r\narr2D = np.array([[21, 22, 23, 20], [21, 17, 13, 14], [13, 10, 33, 19]])\r\nprint('2D Numpy Array')\r\nprint(arr2D)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>2D Numpy Array\r\n[[21 22 23 20]\r\n[21 17 13 14]\r\n[13 10 33 19]]\r\n<\/pre>\n<p>Suppose if we want to sort this 2D array by 2nd column like this,<\/p>\n<pre>[[21 7 23 14]\r\n[31 10 33 7]\r\n[11 12 13 22]]<\/pre>\n<p>To do that, first, we have to change the positioning of all rows in the 2D numpy array on the basis of sorted values of the 2nd column i.e. column at index 1.<\/p>\n<p><span style=\"color: #ff6600;\">Do 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\/python-convert-matrix-2d-numpy-array-to-a-1d-numpy-array\/\">Python: Convert Matrix \/ 2D Numpy Array to a 1D Numpy Array<\/a><\/li>\n<\/ul>\n<p>Let\u2019s see how to sort it,<\/p>\n<h3><a id=\"Sorting_2D_Numpy_Array_by_column_at_index_1\"><\/a>Sorting 2D Numpy Array by column at index 1<\/h3>\n<p>In this, we will use <code class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">arr2D[:,columnIndex].argsort()<\/code>which will give the array of indices that sort this column.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\n\r\n# Create a 2D Numpy array list of list\r\narr2D = np.array([[21, 22, 23, 20], [21, 17, 13, 14], [13, 10, 33, 19]])\r\nprint('2D Numpy Array')\r\nprint(arr2D)\r\ncolumnIndex = 1\r\n# Sort 2D numpy array by 2nd Column\r\nsortedArr = arr2D[arr2D[:,columnIndex].argsort()]\r\nprint('Sorted 2D Numpy Array')\r\nprint(sortedArr)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>2D Numpy Array\r\n[[21 22 23 20]\r\n[21 17 13 14]\r\n[13 10 33 19]]\r\n\r\nSorted 2D Numpy Array\r\n[[13 10 33 19]\r\n[21 17 13 14]\r\n[21 22 23 20]]\r\n\r\n<\/pre>\n<p>So in the above example, you have seen we changed the position of all rows in an array on sorted values of the 2nd column means column at index 1.<\/p>\n<h3><a id=\"Sorting_2D_Numpy_Array_by_column_at_index_0\"><\/a>Sorting 2D Numpy Array by column at index 0<\/h3>\n<p>Let&#8217;s see how it will work when we give index 0.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\n\r\n# Create a 2D Numpy array list of list\r\narr2D = np.array([[21, 22, 23, 20], [21, 17, 13, 14], [13, 10, 33, 19]])\r\nprint('2D Numpy Array')\r\nprint(arr2D)\r\n# Sort 2D numpy array by first column\r\nsortedArr = arr2D[arr2D[:,0].argsort()]\r\nprint('Sorted 2D Numpy Array')\r\nprint(sortedArr)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>2D Numpy Array\r\n[[21 22 23 20]\r\n[21 17 13 14]\r\n[13 10 33 19]]\r\n\r\nSorted 2D Numpy Array\r\n[[13 10 33 19]\r\n[21 22 23 20]\r\n[21 17 13 14]]\r\n<\/pre>\n<h3><a id=\"Sorting_2D_Numpy_Array_by_the_Last_Column\"><\/a>Sorting 2D Numpy Array by the Last Column<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\n\r\n# Create a 2D Numpy array list of list\r\narr2D = np.array([[21, 22, 23, 20], [21, 17, 13, 14], [13, 10, 33, 19]])\r\nprint('2D Numpy Array')\r\nprint(arr2D)\r\n# Sort 2D numpy array by last column\r\nsortedArr = arr2D[arr2D[:, -1].argsort()]\r\nprint('Sorted 2D Numpy Array')\r\nprint(sortedArr)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>2D Numpy Array\r\n[[21 22 23 20]\r\n[21 17 13 14]\r\n[13 10 33 19]]\r\n\r\nSorted 2D Numpy Array\r\n[[21 17 13 14]\r\n[13 10 33 19]\r\n[21 22 23 20]]\r\n<\/pre>\n<h2><a id=\"How_to_Sort_the_NumPy_array_by_Row_in_Python?\"><\/a>How to Sort the NumPy array by Row in Python?<\/h2>\n<p>By using similar logic, we can also sort a 2D Numpy array by a single row i.e. mix-up the columns of the 2D numpy array to get the furnished row sorted.<\/p>\n<p>Look at the below examples and learn how it works easily,<\/p>\n<p>Let&#8217;s assume, we have a 2D Numpy array i.e.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Create a 2D Numpy array list of list\r\narr2D = np.array([[11, 12, 13, 22], [21, 7, 23, 14], [31, 10, 33, 7]])\r\nprint('2D Numpy Array')\r\nprint(arr2D)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>2D Numpy Array\r\n[[11 12 13 22]\r\n[21 7 23 14]\r\n[31 10 33 7]]<\/pre>\n<h3><a id=\"Sorting_2D_Numpy_Array_by_row_at_index_position_1\"><\/a>Sorting 2D Numpy Array by row at index position 1<\/h3>\n<p>So we are going to use the above example to show how we sort an array by row.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\n\r\n# Create a 2D Numpy array list of list\r\narr2D = np.array([[21, 22, 23, 20], [21, 17, 13, 14], [13, 10, 33, 19]])\r\nprint('2D Numpy Array')\r\nprint(arr2D)\r\n# Sort 2D numpy array by 2nd row\r\nsortedArr = arr2D [ :, arr2D[1].argsort()]\r\nprint('Sorted 2D Numpy Array')\r\nprint(sortedArr)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>2D Numpy Array\r\n[[21 22 23 20]\r\n[21 17 13 14]\r\n[13 10 33 19]]\r\n\r\nSorted 2D Numpy Array\r\n[[23 20 22 21]\r\n[13 14 17 21]\r\n[33 19 10 13]]\r\n\r\n<\/pre>\n<p>So you can see that it changed column value, as we selected row at given index position using [] operator and using <code>argsort()<\/code>we got sorted indices after that we have changed the position of the column to sort our row.<\/p>\n<h3><a id=\"Sorting_2D_Numpy_Array_by_the_Last_Row\"><\/a>Sorting 2D Numpy Array by the Last Row<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import numpy as np\r\n\r\n# Create a 2D Numpy array list of list\r\narr2D = np.array([[21, 22, 23, 20], [21, 17, 13, 14], [13, 10, 33, 19]])\r\nprint('2D Numpy Array')\r\nprint(arr2D)\r\n# Sort 2D numpy array by last row\r\nsortedArr = arr2D[:, arr2D[-1].argsort()]\r\nprint('Sorted 2D Numpy Array')\r\nprint(sortedArr)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>2D Numpy Array\r\n[[21 22 23 20]\r\n[21 17 13 14]\r\n[13 10 33 19]]\r\n\r\nSorted 2D Numpy Array\r\n[[22 21 20 23]\r\n[17 21 14 13]\r\n[10 13 19 33]]\r\n<\/pre>\n<h3>Conclusion:<\/h3>\n<p>So in this article, I have shown you different ways to sorting 2D Numpy Array by column or row in Python.<\/p>\n<p>Happy learning guys!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, we are going to discuss how to sort the NumPy array by column or row in Python. Just click on the direct links available here and directly jump into the example codes on sorting 2D Numpy Array by Column or Row in Python. How to Sort the NumPy array by Column in &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/sorting-2d-numpy-array-by-column-or-row-in-python\/\"> <span class=\"screen-reader-text\">Sorting 2D Numpy Array by column or row in Python | How to sort the\u00a0NumPy array by column or row in Python?<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":5788,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sorting 2D Numpy Array by column or row in Python | How to sort the\u00a0NumPy array by column or row in Python? - Python Programs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/python-programs.com\/sorting-2d-numpy-array-by-column-or-row-in-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sorting 2D Numpy Array by column or row in Python | How to sort the\u00a0NumPy array by column or row in Python? - Python Programs\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, we are going to discuss how to sort the NumPy array by column or row in Python. 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