{"id":2855,"date":"2023-10-17T09:38:58","date_gmt":"2023-10-17T04:08:58","guid":{"rendered":"https:\/\/python-programs.com\/?p=2855"},"modified":"2023-11-10T11:45:02","modified_gmt":"2023-11-10T06:15:02","slug":"find-the-index-of-value-in-numpy-array-using-numpy-where","status":"publish","type":"post","link":"https:\/\/python-programs.com\/find-the-index-of-value-in-numpy-array-using-numpy-where\/","title":{"rendered":"Find the index of value in Numpy Array using numpy.where()"},"content":{"rendered":"<h2>How to find the index of value in Numpy array using numpy.where() in Python ?<\/h2>\n<p>NumPy or Numerical Python which is a general purpose array processing package and it is used for working with arrays. In python there <code>numpy.where( )<\/code> function which is used to select elements from a numpy array, based on a condition and if the condition is satisfied we perform some operations.<\/p>\n<pre>Syntax : <span class=\"hljs-selector-tag\">numpy<\/span><span class=\"hljs-selector-class\">.where<\/span>(<span class=\"hljs-selector-tag\">condition[ , x, y ]<\/span>)<\/pre>\n<p>Where<\/p>\n<ul>\n<li>condition is a conditional expression which returns the Numpy array of bool<\/li>\n<li>x,y are two optional arrays i.e either both are passed or not passed<\/li>\n<\/ul>\n<p>In this article we will discuss about how to get the index of an element in a Numpy array (both 1D &amp; 2D) using this function. So, let&#8217;s explore the concept well.<\/p>\n<h3>1. Find index of a value in 1D Numpy array :<\/h3>\n<p>Suppose <code>array_one<\/code> is an 1D Numpy array, So it will look like<\/p>\n<pre><span class=\"enlighter-text\">array_one = np.<\/span><span class=\"enlighter-m1\">array<\/span><span class=\"enlighter-g1\">([<\/span><span class=\"enlighter-n1\">10<\/span><span class=\"enlighter-text\">, 15<\/span><span class=\"enlighter-text\">, 2<\/span><span class=\"enlighter-n1\">0<\/span><span class=\"enlighter-text\">, 25<\/span><span class=\"enlighter-text\">, 30<\/span><span class=\"enlighter-text\">, 35<\/span><span class=\"enlighter-text\">, 4<\/span><span class=\"enlighter-n1\">0<\/span><span class=\"enlighter-text\">, 45<\/span><span class=\"enlighter-text\">, 50<\/span><span class=\"enlighter-text\">, 30<\/span><span class=\"enlighter-text\">, 60<\/span><span class=\"enlighter-text\">, 6<\/span><span class=\"enlighter-n1\">5<\/span><span class=\"enlighter-text\">, 70<\/span><span class=\"enlighter-text\">, 75, 80, 85, 30, 95<\/span><span class=\"enlighter-g1\">])<\/span><\/pre>\n<p>Now, let&#8217;s find the index number of 30 in this Numpy array.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">Program :\r\n\r\nimport numpy as np\r\n# numpy array created with a list of numbers\r\narray_one = np.array([10, 15, 20, 25, 30, 35, 40, 45, 50, 30, 60, 65, 70, 75, 80, 85, 30, 95])\r\n# Get the index of elements with value 30\r\noutput = np.where(array_one == 30)\r\n#printing the indices where the element 30 is present\r\nprint('Tuple of arrays returned : ', output)\r\nprint(\"Elements with value 30 exists at following indices\", output[0], sep='\\n')<\/pre>\n<div class=\"\">\n<pre><span class=\"enlighter-text\">Output :\r\nTuple of arrays returned :  (array([4, 9, 16]), )\r\nElements with value 30 exists at following indices \r\n[4 9 16]\r\n<\/span><\/pre>\n<\/div>\n<p>As result is a tuple of arrays which contains the indices where value 30 exists in array array_one i.e. so it returned<\/p>\n<pre><span class=\"enlighter-text\">(array([4, 9, 16]), )<\/span><\/pre>\n<p>And as a flat 1D array it returned<\/p>\n<pre><span class=\"enlighter-text\">[4 9 16]<\/span><\/pre>\n<p>And if the element is not present in the Numpy array then returned array of indices will be empty. So let&#8217;s check that with an example<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">Program :\r\n\r\nimport numpy as np\r\n# numpy array created with a list of numbers\r\narray_one = np.array([10, 15, 20, 25, 30, 35, 40, 45, 50, 30, 60, 65, 70, 75, 80, 85, 30, 95])\r\n# Get the index of elements with value 100\r\noutput = np.where(array_one == 100)\r\nprint('Tuple of arrays returned : ', output)\r\n#printing the indices where the element 100 is present\r\n#As 100 is not present in Numpy array i.e array_one so returned array with indices is empty \r\nprint(\"Elements with value 30 exists at following indices\", output[0], sep='\\n')\r\n<\/pre>\n<pre><span class=\"enlighter-text\">Output :\r\n\r\nTuple of arrays returned : (array([  ]), )\r\nElements with value 30 exists at following indices\r\n[  ]\r\n<\/span><\/pre>\n<h3>2. Find index of a value in 2D Numpy array :<\/h3>\n<p>Suppose <code>array_two<\/code> is an 2D Numpy array, So it will look like<\/p>\n<pre><span class=\"enlighter-text\">array_two = np.<\/span><span class=\"enlighter-m1\">array<\/span><span class=\"enlighter-g1\">([ [<\/span><span class=\"enlighter-n1\">10<\/span><span class=\"enlighter-text\">, 15<\/span><span class=\"enlighter-text\">, 2<\/span><span class=\"enlighter-n1\">0],<\/span><span class=\"enlighter-text\"> [25<\/span><span class=\"enlighter-text\">, 30<\/span><span class=\"enlighter-text\">, 35]<\/span><span class=\"enlighter-text\">, [4<\/span><span class=\"enlighter-n1\">0<\/span><span class=\"enlighter-text\">, 45<\/span><span class=\"enlighter-text\">, 50]<\/span><span class=\"enlighter-text\">, [30<\/span><span class=\"enlighter-text\">, 60<\/span><span class=\"enlighter-text\">, 6<\/span><span class=\"enlighter-n1\">5]<\/span><span class=\"enlighter-text\">, [70<\/span><span class=\"enlighter-text\">, 75, 80], [85, 30, 95<\/span><span class=\"enlighter-g1\">] ])<\/span><\/pre>\n<p>Now, let&#8217;s find the index number of 30 in this Numpy array.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">Program :\r\n\r\nimport numpy as np\r\n#\u00a0numpy\u00a0array\u00a0created\u00a0with\u00a0a\u00a0list\u00a0of\u00a0numbers\r\narray_two = np.array([ [10, 15, 20], [25, 30, 35], [40, 45, 50], [30, 60, 65], [70, 75, 80], [85, 30, 95] ])\r\n# Get the index of elements with value 30\r\noutput = np.where(array_two == 30)\r\n#printing the indices where the element 30 is present\r\nprint('Tuple of arrays returned: ', output)\r\nprint(\"Elements with value 30 first exists at index:\", output[0][0])<\/pre>\n<pre><span class=\"hljs-keyword\">Output :\r\nTuple<\/span> <span class=\"hljs-keyword\">of<\/span> arrays returned: (<span class=\"hljs-keyword\">array<\/span>([1, 3, 5]), <span class=\"hljs-keyword\">array<\/span>([<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>, 1])) \r\nElements <span class=\"hljs-keyword\">with<\/span> value 30 first exists at <span class=\"hljs-keyword\">index<\/span>: 1<\/pre>\n<p>Where,<\/p>\n<p>First array [1, 3, 5] represents <strong><em>row indices<\/em><\/strong> where the element 30 is present<\/p>\n<p>And the second array [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">0<\/span>, 1] represents <em><strong>column indices<\/strong><\/em> where the element 30 is present.<\/p>\n<p><strong>3.<\/strong> <strong>Get indices of elements based on multiple conditions in Numpy :<\/strong><\/p>\n<p><strong>Example : 1<\/strong><\/p>\n<p>Get the indices of elements with value less than 20 and greater than 10.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">Program :\r\n\r\nimport numpy as np\r\n# numpy array created with a list of numbers\r\nexample_array = np.array([11, 6, 13, 8, 15, 16, 7, 15, 1, 2, 14, 19, 4, 20])\r\n# Get the index of elements of value less than 20 and greater than 10\r\noutput = np.where((example_array  &gt; 10) &amp; (example_array  &lt; 20))\r\nprint(\"Elements which are less than 20 and greater than 10 exists at indices\",output, sep='\\n')<\/pre>\n<pre><span class=\"enlighter-text\">Output :\r\nElements which are<\/span><span class=\"enlighter-text\"> less than 20<\/span>\u00a0<span class=\"enlighter-k3\">and<\/span><span class=\"enlighter-text\"> greater than <\/span><span class=\"enlighter-n1\">10<\/span><span class=\"enlighter-text\"> exists at <\/span><span class=\"enlighter-m0\">indices \r\n<\/span><span class=\"enlighter-g1\">(<\/span><span class=\"enlighter-m0\">array<\/span><span class=\"enlighter-g1\">([<\/span> 0<span class=\"enlighter-text\">, 2<\/span><span class=\"enlighter-text\">, <\/span><span class=\"enlighter-n1\">4<\/span><span class=\"enlighter-text\">, 5<\/span><span class=\"enlighter-text\">, 7<\/span><span class=\"enlighter-text\">, <\/span><span class=\"enlighter-n1\">10, 11<\/span><span class=\"enlighter-g1\">]<\/span><span class=\"enlighter-g1\">)<\/span><span class=\"enlighter-text\">,<\/span><span class=\"enlighter-g1\">)<\/span><\/pre>\n<p><strong>Example : 2<\/strong><\/p>\n<p>Get the first index of an element in numpy array.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">Program :\r\n\r\nimport numpy as np\r\n#\u00a0numpy\u00a0array\u00a0created\u00a0with\u00a0a\u00a0list\u00a0of\u00a0numbers\r\nexample_array = np.array([15, 6, 13, 8, 15, 16, 7, 15, 1, 2, 14, 19, 4, 20])\r\n# Get the index of elements with value less than 20 and greater than 10\r\noutput = np.where(example_array == 15)\r\nif len(output) &gt; 0 and len(output[0]) &gt; 0:\r\n    print('First Index of element with value 15 is ', output[0][0])<\/pre>\n<pre>Output :\r\nFirst Index of element with value 15 is 0<\/pre>\n<p><strong>Example : 3<\/strong><\/p>\n<p>Get the indices of the elements which is less than equal to 2<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">Program :\r\n\r\nimport numpy as np \r\narr = np.arange(10)\r\n#prints the array\r\nprint(arr)\r\n#prints indices of the elements which is less than equal to 2\r\nprint(arr[arr &lt;= 2])<\/pre>\n<pre>Output :\r\n[0 1 2 3 4 5 6 7 8 9] \r\n[0 1 2]<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>How to find the index of value in Numpy array using numpy.where() in Python ? NumPy or Numerical Python which is a general purpose array processing package and it is used for working with arrays. In python there numpy.where( ) function which is used to select elements from a numpy array, based on a condition &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/find-the-index-of-value-in-numpy-array-using-numpy-where\/\"> <span class=\"screen-reader-text\">Find the index of value in Numpy Array using numpy.where()<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"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>Find the index of value in Numpy Array using numpy.where() - 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\/find-the-index-of-value-in-numpy-array-using-numpy-where\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Find the index of value in Numpy Array using numpy.where() - Python Programs\" \/>\n<meta property=\"og:description\" content=\"How to find the index of value in Numpy array using numpy.where() in Python ? 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NumPy or Numerical Python which is a general purpose array processing package and it is used for working with arrays. 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