{"id":4417,"date":"2024-03-14T01:26:40","date_gmt":"2024-03-14T01:26:40","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-function-of-np-vstack-in-python\/"},"modified":"2025-07-31T07:36:18","modified_gmt":"2025-07-31T07:36:18","slug":"what-is-the-function-of-np-vstack-in-python","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-function-of-np-vstack-in-python\/","title":{"rendered":"np.vstack in Python: Stack Arrays Vertically with NumPy"},"content":{"rendered":"<p>The np.vstack function in NumPy is used to stack arrays along the vertical direction (row-wise). Specifically, np.vstack stacks two or more arrays vertically to create a new array.<\/p>\n<p>For example, if there are two 2D arrays, array1 and array2, with the same number of columns, we can use np.vstack([array1, array2]) to stack them together row-wise and create a new 2D array.<\/p>\n<pre class=\"post-pre\"><code class=\"lang-python\">import numpy as np\r\n\r\narray1 = np.array([[1, 2, 3],\r\n                   [4, 5, 6]])\r\n\r\narray2 = np.array([[7, 8, 9],\r\n                   [10, 11, 12]])\r\n\r\nresult = np.vstack([array1, array2])\r\nprint(result)\r\n<\/code><\/pre>\n<p>The code above will print the following results:<\/p>\n<pre class=\"post-pre\"><code>[[ 1  2  3]\r\n [ 4  5  6]\r\n [ 7  8  9]\r\n [10 11 12]]\r\n<\/code><\/pre>\n<p>In this way, np.vstack can assist us in stacking arrays along the vertical direction while processing arrays.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The np.vstack function in NumPy is used to stack arrays along the vertical direction (row-wise). Specifically, np.vstack stacks two or more arrays vertically to create a new array. For example, if there are two 2D arrays, array1 and array2, with the same number of columns, we can use np.vstack([array1, array2]) to stack them together row-wise [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[3944,3943,73,72,3945],"class_list":["post-4417","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-array-stacking","tag-np-vstack","tag-numpy","tag-python","tag-vertical-stack"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>np.vstack in Python: Stack Arrays Vertically with NumPy - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how np.vstack in NumPy stacks arrays vertically. Simple Python examples and usage explained clearly.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/what-is-the-function-of-np-vstack-in-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"np.vstack in Python: Stack Arrays Vertically with NumPy\" \/>\n<meta property=\"og:description\" content=\"Learn how np.vstack in NumPy stacks arrays vertically. 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