{"id":340,"date":"2022-07-01T22:38:12","date_gmt":"2022-10-01T21:37:16","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/python%e3%81%aenumpy-cumsum\/"},"modified":"2025-07-31T22:48:27","modified_gmt":"2025-07-31T13:48:27","slug":"python%e3%81%aenumpy-cumsum","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/python%e3%81%aenumpy-cumsum\/","title":{"rendered":"Python\u306enumpy.cumsum()"},"content":{"rendered":"<p>Python\u306enumpy cumsum()\u95a2\u6570\u306f\u3001\u6307\u5b9a\u3057\u305f\u8ef8\u306b\u6cbf\u3063\u3066\u8981\u7d20\u306e\u7d2f\u7a4d\u548c\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<h2>Python\u306enumpy cumsum()\u306e\u69cb\u6587<\/h2>\n<p>cumsum()\u30e1\u30bd\u30c3\u30c9\u306e\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>cumsum(array, axis=None, dtype=None, out=None)\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li>The array can be ndarray or array-like objects such as nested lists.<\/li>\n<li>The axis parameter defines the axis along which the cumulative sum is calculated. If the axis is not provided then the array is flattened and the cumulative sum is calculated for the result array.<\/li>\n<li>The dtype parameter defines the output data type, such as float and int.<\/li>\n<li>The out optional parameter is used to specify the array for the result.<\/li>\n<\/ul>\n<h2>Python\u306enumpy.cumsum()\u306e\u4f8b\u3092\u65e5\u672c\u8a9e\u3067\u8ff0\u3079\u3066\u304f\u3060\u3055\u3044\u3002<\/h2>\n<p>\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u3001numpy\u914d\u5217\u306e\u8981\u7d20\u306e\u7d2f\u7a4d\u548c\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>1. \u8ef8\u306a\u3057\u3067\u306eNumPy\u914d\u5217\u8981\u7d20\u306e\u7d2f\u7a4d\u548c<\/h3>\n<pre class=\"post-pre\"><code>import numpy as np\r\n\r\narray1 = np.array(\r\n    [[1, 2],\r\n     [3, 4],\r\n     [5, 6]])\r\n\r\ntotal = np.cumsum(array1)\r\nprint(f'Cumulative Sum of all the elements is {total}')\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a\u5168\u8981\u7d20\u306e\u7d2f\u7a4d\u548c\u306f[1 3 6 10 15 21]\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u914d\u5217\u306f\u6700\u521d\u306b[1 2 3 4 5 6]\u306b\u5e73\u5766\u5316\u3055\u308c\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u305d\u306e\u5f8c\u3001\u7d2f\u7a4d\u548c\u304c\u8a08\u7b97\u3055\u308c\u3001[1 3 6 10 15 21]\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>2. \u8ef8\u306b\u6cbf\u3063\u305f\u7d2f\u7a4d\u548c<\/h3>\n<pre class=\"post-pre\"><code>import numpy as np\r\n\r\narray1 = np.array(\r\n    [[1, 2],\r\n     [3, 4],\r\n     [5, 6]])\r\n\r\ntotal_0_axis = np.cumsum(array1, axis=0)\r\nprint(f'Cumulative Sum of elements at 0-axis is:\\n{total_0_axis}')\r\n\r\ntotal_1_axis = np.cumsum(array1, axis=1)\r\nprint(f'Cumulative Sum of elements at 1-axis is:\\n{total_1_axis}')\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Cumulative Sum of elements at 0-axis is:\r\n[[ 1  2]\r\n [ 4  6]\r\n [ 9 12]]\r\nCumulative Sum of elements at 1-axis is:\r\n[[ 1  3]\r\n [ 3  7]\r\n [ 5 11]]\r\n<\/code><\/pre>\n<h3>3. \u7d2f\u7a4d\u548c\u914d\u5217\u306e\u30c7\u30fc\u30bf\u578b\u3092\u6307\u5b9a\u3059\u308b\u3002<\/h3>\n<pre class=\"post-pre\"><code>import numpy as np\r\n\r\narray1 = np.array(\r\n    [[1, 2],\r\n     [3, 4],\r\n     [5, 6]])\r\n\r\ntotal_1_axis = np.cumsum(array1, axis=1, dtype=float)\r\nprint(f'Cumulative Sum of elements at 1-axis is:\\n{total_1_axis}')\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>Cumulative Sum of elements at 1-axis is:\r\n[[ 1.  3.]\r\n [ 3.  7.]\r\n [ 5. 11.]]\r\n<\/code><\/pre>\n<p>\u53c2\u8003\uff1aAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python\u306enumpy cumsum()\u95a2\u6570\u306f\u3001\u6307\u5b9a\u3057\u305f\u8ef8\u306b\u6cbf\u3063\u3066\u8981\u7d20\u306e\u7d2f\u7a4d\u548c\u3092\u8fd4\u3057\u307e\u3059\u3002 Python\u306enumpy cumsum()\u306e\u69cb\u6587 cumsum()\u30e1\u30bd\u30c3\u30c9\u306e\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 cumsum(array, [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[31,26],"class_list":["post-340","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-python","tag-26"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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