{"id":3739,"date":"2022-09-01T17:00:41","date_gmt":"2022-09-01T11:30:41","guid":{"rendered":"https:\/\/btechgeeks.com\/?p=3739"},"modified":"2022-09-01T17:37:26","modified_gmt":"2022-09-01T12:07:26","slug":"python-convert-a-1d-array-to-a-2d-numpy-array-or-matrix","status":"publish","type":"post","link":"https:\/\/btechgeeks.com\/python-convert-a-1d-array-to-a-2d-numpy-array-or-matrix\/","title":{"rendered":"Converting 1d array to 2d array &#8211; Python: Convert a 1D array to a 2D Numpy array or Matrix"},"content":{"rendered":"<p><a href=\"https:\/\/btechgeeks.com\/numpy-array-tutorial\/\">Python NumPy<\/a> is the ultimate package in a python programming language that includes multidimensional array objects and a set of operations or routines to execute various operations on the array and process of the array. Where this numpy package is comprised of a function known as numpy.reshape() that performs converting a 1D array into a 2-D array of required dimensions (n x m). This function gives a new required shape without changing the data of the 1-D array.<\/p>\n<p>This tutorial of Convert a 1D array to a 2D Numpy array or Matrix in Python helps programmers to learn the concept precisely and implement the logic in required situations. However, you can also learn how to construct the 2D array row-wise and column-wise, from a 1D array from this tutorial.<\/p>\n<ul>\n<li><a href=\"#How_to_convert_a_1D_array_to_a_2D_Numpy_array_or_Matrix_in_Python\">How to convert a 1D array to a 2D Numpy array or Matrix in Python<\/a><\/li>\n<li><a href=\"#Reshape_1D_array_to_2D_array\">Reshape 1D array to 2D array<\/a><\/li>\n<li><a href=\"#Reshaped_2D_array_in_view_of_a_1D_array\">Reshaped 2D array in view of a 1D array<\/a><\/li>\n<li><a href=\"#Convert_a_1D_numpy_array_to_a_3D_numpy_array_using_numpy.reshape()\">Convert a 1D numpy array to a 3D numpy array using numpy.reshape()<\/a><\/li>\n<li><a href=\"#Convert_1D_numpy_array_to_a_2D_numpy_array_along_the_column\">Convert 1D numpy array to a 2D numpy array along the column<\/a><\/li>\n<li><a href=\"#Convert_2D_array_to_1D_array_as_Copy\">Convert 2D array to 1D array as Copy<\/a><\/li>\n<\/ul>\n<h2><a id=\"How_to_convert_a_1D_array_to_a_2D_Numpy_array_or_Matrix_in_Python\"><\/a>How to convert a 1D array to a 2D Numpy array or Matrix in Python<\/h2>\n<p><strong>Converting 1d array to 2d array: <\/strong>In this section, python learners will find the correct explanation on how to convert a 1D Numpy array to a 2D Numpy array or matric with the help of reshape() function.<\/p>\n<p>One dimensional array contains elements only in one dimension.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18909 aligncenter\" src=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/program-to-convert-a-1D-array-to-a-2D-Numpy-array-or-Matrix-in-Python.png\" alt=\"program to convert a 1D array to a 2D Numpy array or Matrix in Python\" width=\"740\" height=\"348\" srcset=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/program-to-convert-a-1D-array-to-a-2D-Numpy-array-or-Matrix-in-Python.png 740w, https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/program-to-convert-a-1D-array-to-a-2D-Numpy-array-or-Matrix-in-Python-300x141.png 300w\" sizes=\"(max-width: 740px) 100vw, 740px\" \/><\/p>\n<p>Let\u2019s try with an example:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#program\r\n\r\n#import required libraries\r\nimport pandas as pd\r\nimport numpy as np\r\n#create 1D numpy array\r\narr= np.array([2,3,1,8,6,4,7,0,9,5])\r\nprint(arr)\r\n<\/pre>\n<pre>Output :\r\n[2 3 1 8 6 4 7 0 9 5]<\/pre>\n<ul>\n<li><a href=\"https:\/\/btechgeeks.com\/python-programming-numpy\/\">Python Programming \u2013 NumPy<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/python-numpy-ravel-function-tutorial-with-examples\/\">Python: numpy.ravel() function Tutorial with examples<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/sorting-2d-numpy-array-by-column-or-row-in-python\/\">Sorting 2D Numpy Array by column or row in Python | How to sort the\u00a0NumPy array by column or row in Python?<\/a><\/li>\n<\/ul>\n<p>Now we will convert it into a 2D array of shape 5X2 i.e 5 rows and 2 columns like shown below:<\/p>\n<pre>[[0 1 2 3 4]\r\n[5 6 7 8 9]]<\/pre>\n<h3><a id=\"Reshape_1D_array_to_2D_array\"><\/a>Reshape 1D array to 2D array<\/h3>\n<p>First, import the numpy module,<\/p>\n<pre>import numpy as np<\/pre>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18910 aligncenter\" src=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Reshape-1D-array-to-2D-array.png\" alt=\"Program to Reshape 1D array to 2D array\" width=\"487\" height=\"384\" srcset=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Reshape-1D-array-to-2D-array.png 487w, https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Reshape-1D-array-to-2D-array-300x237.png 300w\" sizes=\"(max-width: 487px) 100vw, 487px\" \/><\/p>\n<p>Now to change the shape of the numpy array, we will use the reshape() function of the numpy module,<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program:Reshape\u00a01D\u00a0array\u00a0to\u00a02D\u00a0array\r\n\r\n#import required libraries\r\nimport pandas as pd\r\nimport numpy as np\r\n#create 1D numpy array\r\narr= np.array([2,3,1,8,6,4,7,0,9,5])\r\nnewarr = arr.reshape(5,2)\r\nprint(newarr)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>[[2 3]\r\n [1 8]\r\n [6 4]\r\n [7 0]\r\n\u00a0[9 5]]<\/pre>\n<p>First, we import the numpy module and then passed the 1D array as the first argument and the new shape i.e a tuple (5,2) as the second argument. It returned the 2D array.<\/p>\n<p><strong>Note:<\/strong> The new shape of the array must be compatible with the original shape of the input array, if not then it will raise ValueError.<\/p>\n<h4>numpy.reshape() function<\/h4>\n<ul>\n<li>It is used to give a new shape to an array without changing its data.<\/li>\n<li>It returns the new view object(if possible, otherwise returns a copy) of the new shape.<\/li>\n<\/ul>\n<h3><a id=\"Reshaped_2D_array_in_view_of_a_1D_array\"><\/a>Reshaped 2D array in view of a 1D array<\/h3>\n<p>If possible the function returns a view of the original and any modification in the view object will also affect the original input array.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18911 aligncenter\" src=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Reshaped-2D-array-in-view-of-a-1D-array.png\" alt=\"Program to Reshaped 2D array in view of a 1D array\" width=\"580\" height=\"402\" srcset=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Reshaped-2D-array-in-view-of-a-1D-array.png 580w, https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Reshaped-2D-array-in-view-of-a-1D-array-300x208.png 300w\" sizes=\"(max-width: 580px) 100vw, 580px\" \/><\/p>\n<p><strong>Example<\/strong>:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program:Reshaped\u00a02D\u00a0array\u00a0in\u00a0view\u00a0of\u00a0a\u00a01D\u00a0array\r\n\r\nimport pandas as pd\r\nimport numpy as np\r\narr_1 = np.array[2, 7, 5, 9, 1, 0, 8, 3]\r\narr_2 = np.reshape(arr_1, (2, 4))\r\naar_2[0][0] = 88\r\nprint(\u20181D array:\u2019)\r\nprint(arr_1)\r\nprint(\u20182D array\u2019)\r\nprint(arr_2)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>1D array:\r\n[88 7 5 9 1 0 8 3]\r\n2D array:\r\n[[88 7 5 9]\r\n[ 1 0 8 3]]<\/pre>\n<h3><a id=\"Convert_a_1D_numpy_array_to_a_3D_numpy_array_using_numpy.reshape()\"><\/a>Convert a 1D numpy array to a 3D numpy array using numpy.reshape()<\/h3>\n<p>In case, we have 12 elements in a 1D numpy array,<\/p>\n<pre>arr = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])<\/pre>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18912 aligncenter\" src=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Convert-a-1D-numpy-array-to-a-3D-numpy-array-using-numpy.reshape.png\" alt=\"Program to Convert a 1D numpy array to a 3D numpy array using numpy.reshape()\" width=\"630\" height=\"384\" srcset=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Convert-a-1D-numpy-array-to-a-3D-numpy-array-using-numpy.reshape.png 630w, https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Convert-a-1D-numpy-array-to-a-3D-numpy-array-using-numpy.reshape-300x183.png 300w\" sizes=\"(max-width: 630px) 100vw, 630px\" \/><\/p>\n<p>Now, let&#8217;s convert this 1D numpy array to a 3D numpy array:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program:Convert\u00a0a\u00a01D\u00a0numpy\u00a0array\u00a0to\u00a0a\u00a03D\u00a0numpy\u00a0array\u00a0using\u00a0numpy.reshape()\r\n\r\nimport pandas as pd\r\nimport numpy as np\r\narr = np.array([2,3,1,8,6,4,7,0,9,5,11,34])\r\narr_3 = np.reshape(arr,(2,2,3))\r\nprint(\u20183D array:\u2019)\r\nprint(arr_3)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>3D array:\r\n[[[2 3 1]\r\n[8 6 4]]\r\n[[7 0 9]\r\n[5 11 34]]]<\/pre>\n<p>Here, the first argument is a 1D array and the second argument is the tuple (2, 2, 3).<\/p>\n<p>It returned a 3D view of the passed array.<\/p>\n<h3><a id=\"Convert_1D_numpy_array_to_a_2D_numpy_array_along_the_column\"><\/a>Convert 1D numpy array to a 2D numpy array along the column<\/h3>\n<p>After converting a 1D array to a 2D array or matrix in the above example, the items from the input array will be shown row-wise i.e.<\/p>\n<ul>\n<li>1st row of a 2D array was created from items at index 0 to 2 in the input array<\/li>\n<li>2nd row of a 2D array was created from items at index 3 to 5 in the input array<\/li>\n<li>3rd row of a 2D array was created from items at index 6 to 8 in the input array<\/li>\n<\/ul>\n<p>Now suppose we want to convert a 2D array column-wise so we have to pass the order parameter as \u2018F\u2019 in the <code>reshape()<\/code> function.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter wp-image-18913\" src=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Convert-1D-Numpy-array-to-a-3D-array-with-2-matrices-of-shape-2X3.png\" alt=\"Program to Convert 1D Numpy array to a 3D array with 2 matrices of shape 2X3\" width=\"500\" height=\"218\" srcset=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Convert-1D-Numpy-array-to-a-3D-array-with-2-matrices-of-shape-2X3.png 799w, https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Convert-1D-Numpy-array-to-a-3D-array-with-2-matrices-of-shape-2X3-300x131.png 300w, https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Program-to-Convert-1D-Numpy-array-to-a-3D-array-with-2-matrices-of-shape-2X3-768x334.png 768w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program:Convert\u00a01D\u00a0Numpy\u00a0array\u00a0to\u00a0a\u00a03D\u00a0array\u00a0with\u00a02\u00a0matrices\u00a0of\u00a0shape\u00a02X3\r\n\r\nimport\u00a0pandas\u00a0as\u00a0pd\u00a0\r\nimport\u00a0numpy\u00a0as\u00a0np\r\narr = np.array([2,3,1,8,6,4,7,0,9,5])\r\narr_2 = np.reshape(arr,(2,5),order=\u2019F\u2019)\r\nprint(\u20182D numpy array\u2019)\r\nprint(arr_2)\r\n<\/pre>\n<pre>Output:\r\n2D numpy array:\r\n[[0 2 4 6 8]\r\n\u00a0[1 3 5 7 9]]<\/pre>\n<h3><a id=\"Convert_2D_array_to_1D_array_as_Copy\"><\/a><a href=\"https:\/\/btechgeeks.com\/python-convert-matrix-2d-numpy-array-to-a-1d-numpy-array\/\">Convert 2D array to 1D<\/a> array as Copy<\/h3>\n<p>Suppose we want to create a 2D copy of the 1D numpy array then use the copy() function along with reshape() function.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18914 aligncenter\" src=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Python-Program-to-Convert-2D-array-to-1D-array-as-Copy.png\" alt=\"Python Program to Convert 2D array to 1D array as Copy\" width=\"656\" height=\"420\" srcset=\"https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Python-Program-to-Convert-2D-array-to-1D-array-as-Copy.png 656w, https:\/\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Python-Program-to-Convert-2D-array-to-1D-array-as-Copy-300x192.png 300w\" sizes=\"(max-width: 656px) 100vw, 656px\" \/><\/p>\n<p>Let\u2019s try with an example:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program:Convert\u00a02D\u00a0array\u00a0to\u00a01D\u00a0array\u00a0as\u00a0Copy\r\n\r\nimport pandas as pd \r\nimport numpy as np\r\narr_1 = np.array[2, 7, 5, 9, 1, 0, 8, 3]\r\narr_2 = np.reshape(arr_1, (2, 4).copy())\r\n#modify the 2D array that will not affect the original array\r\naar_2[0][0] = 88\r\nprint(\u20181D array:\u2019)\r\nprint(arr_1)\r\nprint(\u20182D array\u2019)\r\nprint(arr_2)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>1D array:\r\n[2 7 5 9 1 0 8 3]\r\n2D array:\r\n[[88 7 5 9]\r\n\u00a0[ 1 0 8 3]]<\/pre>\n<p>Here, the 2D array is created of the 1D array. If you want to change the 2D array without changing the original array, just use the copy() function and the reshape() function.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python NumPy is the ultimate package in a python programming language that includes multidimensional array objects and a set of operations or routines to execute various operations on the array and process of the array. Where this numpy package is comprised of a function known as numpy.reshape() that performs converting a 1D array into a &#8230; <a title=\"Converting 1d array to 2d array &#8211; Python: Convert a 1D array to a 2D Numpy array or Matrix\" class=\"read-more\" href=\"https:\/\/btechgeeks.com\/python-convert-a-1d-array-to-a-2d-numpy-array-or-matrix\/\" aria-label=\"More on Converting 1d array to 2d array &#8211; Python: Convert a 1D array to a 2D Numpy array or Matrix\">Read more<\/a><\/p>\n","protected":false},"author":9,"featured_media":18916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Converting 1d array to 2d array - Python: Convert a 1D array to a 2D Numpy array or Matrix - BTech Geeks<\/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:\/\/btechgeeks.com\/python-convert-a-1d-array-to-a-2d-numpy-array-or-matrix\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Converting 1d array to 2d array - Python: Convert a 1D array to a 2D Numpy array or Matrix - BTech Geeks\" \/>\n<meta property=\"og:description\" content=\"Python NumPy is the ultimate package in a python programming language that includes multidimensional array objects and a set of operations or routines to execute various operations on the array and process of the array. 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