{"id":3429,"date":"2021-08-18T13:53:05","date_gmt":"2021-08-18T08:23:05","guid":{"rendered":"https:\/\/python-programs.com\/?p=3429"},"modified":"2021-11-22T18:39:34","modified_gmt":"2021-11-22T13:09:34","slug":"how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python","status":"publish","type":"post","link":"https:\/\/python-programs.com\/how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python\/","title":{"rendered":"How to save Numpy Array to a CSV File using numpy.savetxt() in Python? | Savetxt Function&#8217;s Working in Numpy with Examples"},"content":{"rendered":"<p>NumPy arrays are very essential data structures for working with data in Python, machine learning models. Python\u2019s Numpy module provides a function to save a numpy array to a txt file with custom delimiters and other custom options. In this tutorial, we will discuss the procedure of how to save Numpy Array to a CSV File with clear steps.<\/p>\n<ul>\n<li><a href=\"#numpy.savetxt()_Function\">numpy.savetxt() Function<\/a><\/li>\n<li><a href=\"#How_to_save_Numpy_Array_to_a_CSV_File_using_numpy.savetxt()_in_Python?\">How to save Numpy Array to a CSV File using numpy.savetxt() in Python?<\/a><\/li>\n<li><a href=\"#Example_Program_for_Saving_a_Numpy_Array_to_a_CSV_File\">Example Program for Saving a Numpy Array to a CSV File<\/a><\/li>\n<li><a href=\"#Save_1D_Numpy_array_to_CSV_file_with_Header_and_Footer\">Save 1D Numpy array to CSV file with Header and Footer<\/a><\/li>\n<\/ul>\n<h2><a id=\"numpy.savetxt()_Function\"><\/a>numpy.savetxt() Function<\/h2>\n<p>The <code>numpy.savetxt()<\/code> function is the counterpart of the NumPy <code>loadtxt()<\/code> function and can save arrays in delimited file formats such as CSV. Save the array we created with the following function call:<\/p>\n<pre><span class=\"enlighter-text\">Synatx : numpy.<\/span><span class=\"enlighter-m1\">savetxt<\/span><span class=\"enlighter-g1\">(<\/span><span class=\"enlighter-text\">fname, array_name, fmt=<\/span><span class=\"enlighter-s0\">'%.18e'<\/span><span class=\"enlighter-text\">, delimiter=<\/span><span class=\"enlighter-s0\">' '<\/span><span class=\"enlighter-text\">, newline=<\/span><span class=\"enlighter-s0\">'\\n'<\/span><span class=\"enlighter-text\">, header=<\/span><span class=\"enlighter-s0\">''<\/span><span class=\"enlighter-text\">, footer=<\/span><span class=\"enlighter-s0\">''<\/span><span class=\"enlighter-text\">, comments=<\/span><span class=\"enlighter-s0\">'# '<\/span><span class=\"enlighter-text\">, encoding=<\/span><span class=\"enlighter-e1\">None<\/span><span class=\"enlighter-g1\">)<\/span><\/pre>\n<p>Where,<\/p>\n<ul>\n<li><strong>fname: <\/strong>If the filename ends in .gz, the file is automatically saved in compressed gzip format. The loadtxt() function can understand gzipped files transparently.<\/li>\n<li><strong>arr_name<\/strong>: It indicates data to be saved like 1D or 2D numpy array.<\/li>\n<li><strong>fmt<\/strong>: It refers to a formatting pattern or sequence of patterns, which will be used while saving elements to file.<\/li>\n<li><strong>delimiter<\/strong>: It is optional, refers to string or character to be used as element separator<\/li>\n<li><strong>newline<\/strong>: It is optional, refers to string or character to be used as line separator<\/li>\n<li><strong>header<\/strong>: It refers to a string that is written at the beginning of the file.<\/li>\n<li><strong>footer<\/strong>: It refers to a string that to be written at the end of the txt file.<\/li>\n<li><strong>comments<\/strong>: It refers to a custom comment marker, where the default is \u2018#\u2019. It will be pre-appended to the header and footer.<\/li>\n<\/ul>\n<h2><a id=\"How_to_save_Numpy_Array_to_a_CSV_File_using_numpy.savetxt()_in_Python?\"><\/a>How to save Numpy Array to a CSV File using numpy.savetxt() in Python?<\/h2>\n<p>One of the most common file formats for storing numerical data in files is the comma-separated variable format or CSV in Short. Usually, input data are stored in CSV Files as it is one of the most convenient ways for storing data.<\/p>\n<p>Savetxt function is used to save Numpy Arrays as CSV Files. The function needs a filename and array as arguments to save an array to CSV File. In addition, you need to mention the delimiter; for separating each variable in the file or most commonly comma. You can set via the &#8220;delimiter&#8221; argument.<\/p>\n<h3><a id=\"Example_Program_for_Saving_a_Numpy_Array_to_a_CSV_File\"><\/a>Example Program on How to Save a Numpy Array to a CSV File<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\nimport numpy as np\r\ndef main():\r\n   # Numpy array created with a list of numbers\r\n   array1D = np.array([9, 1, 23, 4, 54, 7, 8, 2, 11, 34, 42, 3])\r\n   print('Real Array : ', array1D)\r\n   print('&lt;** Saved 1D Numpy array to csv file **&gt;')\r\n   # Save Numpy array to csv\r\n   np.savetxt('array.csv', [array1D], delimiter=',', fmt='%d')\r\n   print('*** Saving 1D Numpy array to csv file with Header and Footer ***')\r\n   # Saving Numpy array to csv with custom header and footer\r\n   np.savetxt('array_hf.csv', [array1D], delimiter=',', fmt='%d' , header='A Sample 2D Numpy Array :: Header', footer='This is footer')\r\n\r\n   print('*** Saving 2D Numpy array to csv file ***')\r\n   # A 2D Numpy array list of list created\r\n   array2D = np.array([[111, 11, 45, 22], [121, 22, 34, 14], [131, 33, 23, 7]])\r\n   print('2D Numpy Array')\r\n   print(array2D)\r\n   # Saving 2D numpy array to csv file\r\n   np.savetxt('2darray.csv', array2D, delimiter=',', fmt='%d')\r\n   # Saving 2nd column of 2D numpy array to csv file\r\n   np.savetxt('2darray_column.csv', [array2D[:,1]], delimiter=',', fmt='%d')\r\n   # Saving 2nd row of 2D numpy array to csv file\r\n   np.savetxt('2darray_row.csv', [array2D[1] ], delimiter=',', fmt='%d')\r\n\r\n   # Creating the type of a structure\r\n   dtype = [('Name', (np.str_, 10)), ('Marks', np.float64), ('GradeLevel', np.int32)]\r\n   #Creating a Strucured Numpy array\r\n   structuredArr = np.array([('Sam', 33.3, 3), ('Mike', 44.4, 5), ('Aadi', 66.6, 6), ('Riti', 88.8, 7)], dtype=dtype)\r\n   print(structuredArr)\r\n   # Saving 2D numpy array to csv file\r\n   np.savetxt('struct_array.csv', structuredArr, delimiter=',', fmt=['%s' , '%f', '%d'], header='Name,Marks,Age', comments='')\r\nif __name__ == '__main__':\r\n  main()<\/pre>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-17959\" src=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/08\/Python-Program-for-Saving-Numpy-Array-to-a-CSV-File.png\" alt=\"Python Program for Saving Numpy Array to a CSV File\" width=\"1024\" height=\"852\" srcset=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/08\/Python-Program-for-Saving-Numpy-Array-to-a-CSV-File.png 1024w, https:\/\/python-programs.com\/wp-content\/uploads\/2021\/08\/Python-Program-for-Saving-Numpy-Array-to-a-CSV-File-300x250.png 300w, https:\/\/python-programs.com\/wp-content\/uploads\/2021\/08\/Python-Program-for-Saving-Numpy-Array-to-a-CSV-File-768x639.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p><strong>Output:<\/strong><\/p>\n<pre>Real Array :\u00a0 [ 9\u00a0 1 23\u00a0 4 54\u00a0 7\u00a0 8\u00a0 2 11 34 42\u00a0 3]\r\n&lt;** Saved 1D Numpy array to csv file **&gt;\r\n&lt;** Saved 1D Numpy array to csv file with custom\u00a0 Header and Footer **&gt;\r\n&lt;** Save 2D Numpy array to csv file **&gt;\r\n* 2D Numpy Array *\r\n[[111\u00a0 11\u00a0 45\u00a0 22]\r\n[121\u00a0 22\u00a0 34\u00a0 14]\r\n[131\u00a0 33\u00a0 23\u00a0\u00a0 7]]\r\n[('Rags', 33.3, 3) ('Punit', 44.4, 5) ('Drishti', 66.6, 6)\u00a0 ('Ritu', 88.8, 7)]<\/pre>\n<p>The Passed Delimeter &#8216;,&#8217; will change to CSV Format. In addition, the format string %d passed will store the elements as integers. By default, it will store numbers in float format. Keep in mind that if you don&#8217;t mention [] around numpy array to change it to list while passing numpy.savetxt() comma delimiter willn&#8217;t work and uses &#8216;\\n&#8217; by default. Thus, surrounding array by [] i.e. [arr] is mandatory.<\/p>\n<h3><a id=\"Save_1D_Numpy_array_to_CSV_file_with_Header_and_Footer\"><\/a>Save 1D Numpy array to CSV file with Header and Footer<\/h3>\n<p>In order to add comments to the header and footer while saving to a CSV File, we can pass the Header and Footer Parameters as such<\/p>\n<pre># Save Numpy array to csv with custom header and footer\r\nnp.savetxt('array_hf.csv', [arr], delimiter=',', fmt='%d' , header='A Sample 2D Numpy Array :: Header', footer='This is footer')<\/pre>\n<p>Usually, By default comments in both the header and footer are pre-appended by \u2018#\u2019. To change this we can pass the parameter comments like comments=\u2019@\u2019.<\/p>\n<h3>Final Words<\/h3>\n<p>Numpy savetxt can be an extremely helpful method for saving an array to CSV File. If you want to manipulate or change the existing data set this can be a great method. If you have any queries don&#8217;t hesitate to ask us via comment box so that we can get back to you at the soonest possible. Bookmark our site for the latest updates on Python, Java, C++, and Other Programming Languages.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NumPy arrays are very essential data structures for working with data in Python, machine learning models. Python\u2019s Numpy module provides a function to save a numpy array to a txt file with custom delimiters and other custom options. In this tutorial, we will discuss the procedure of how to save Numpy Array to a CSV &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python\/\"> <span class=\"screen-reader-text\">How to save Numpy Array to a CSV File using numpy.savetxt() in Python? | Savetxt Function&#8217;s Working in Numpy with Examples<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":17960,"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>How to save Numpy Array to a CSV File using numpy.savetxt() in Python? | Savetxt Function&#039;s Working in Numpy with Examples - 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\/how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to save Numpy Array to a CSV File using numpy.savetxt() in Python? | Savetxt Function&#039;s Working in Numpy with Examples - Python Programs\" \/>\n<meta property=\"og:description\" content=\"NumPy arrays are very essential data structures for working with data in Python, machine learning models. 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Python\u2019s Numpy module provides a function to save a numpy array to a txt file with custom delimiters and other custom options. In this tutorial, we will discuss the procedure of how to save Numpy Array to a CSV &hellip; How to save Numpy Array to a CSV File using numpy.savetxt() in Python? | Savetxt Function&#8217;s Working in Numpy with Examples Read More &raquo;","og_url":"https:\/\/python-programs.com\/how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python\/","og_site_name":"Python Programs","article_publisher":"https:\/\/www.facebook.com\/btechgeeks","article_published_time":"2021-08-18T08:23:05+00:00","article_modified_time":"2021-11-22T13:09:34+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/08\/How-to-save-Numpy-Array-to-a-CSV-File-using-numpy.savetxt-in-Python.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_creator":"@btech_geeks","twitter_site":"@btech_geeks","twitter_misc":{"Written by":"Satyabrata Jena","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/python-programs.com\/#organization","name":"BTech Geeks","url":"https:\/\/python-programs.com\/","sameAs":["https:\/\/www.instagram.com\/btechgeeks\/","https:\/\/www.linkedin.com\/in\/btechgeeks","https:\/\/in.pinterest.com\/btechgeek\/","https:\/\/www.youtube.com\/channel\/UC9MlCqdJ3lKqz2p5114SDIg","https:\/\/www.facebook.com\/btechgeeks","https:\/\/twitter.com\/btech_geeks"],"logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/python-programs.com\/#\/schema\/logo\/image\/","url":"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png","contentUrl":"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png","width":350,"height":70,"caption":"BTech Geeks"},"image":{"@id":"https:\/\/python-programs.com\/#\/schema\/logo\/image\/"}},{"@type":"WebSite","@id":"https:\/\/python-programs.com\/#website","url":"https:\/\/python-programs.com\/","name":"Python Programs","description":"Python Programs with Examples, How To Guides on Python","publisher":{"@id":"https:\/\/python-programs.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/python-programs.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/python-programs.com\/how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python\/#primaryimage","url":"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/08\/How-to-save-Numpy-Array-to-a-CSV-File-using-numpy.savetxt-in-Python.png","contentUrl":"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/08\/How-to-save-Numpy-Array-to-a-CSV-File-using-numpy.savetxt-in-Python.png","width":1280,"height":720,"caption":"How to save Numpy Array to a CSV File using numpy.savetxt() in Python"},{"@type":"WebPage","@id":"https:\/\/python-programs.com\/how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python\/#webpage","url":"https:\/\/python-programs.com\/how-to-save-numpy-array-to-a-csv-file-using-numpy-savetxt-in-python\/","name":"How to save Numpy Array to a CSV File using numpy.savetxt() in Python? 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