{"id":911,"date":"2023-12-08T15:43:01","date_gmt":"2022-09-20T12:56:05","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/python%e3%81%aenumpy-sum%ef%bc%88%ef%bc%89\/"},"modified":"2025-08-01T03:28:31","modified_gmt":"2025-07-31T18:28:31","slug":"python%e3%81%aenumpy-sum%ef%bc%88%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/python%e3%81%aenumpy-sum%ef%bc%88%ef%bc%89\/","title":{"rendered":"Python\u306enumpy.sum\uff08\uff09"},"content":{"rendered":"<p>Python numpy\u306esum()\u95a2\u6570\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u8ef8\u306b\u6cbf\u3063\u3066\u914d\u5217\u8981\u7d20\u306e\u5408\u8a08\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>Python\u306enumpy\u306esum()\u95a2\u6570\u306e\u69cb\u6587<\/h2>\n<p>Python\u306eNumPy\u306esum()\u30e1\u30bd\u30c3\u30c9\u306e\u69cb\u6587\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>sum(array, axis, dtype, out, keepdims, initial)\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li>The array elements are used to calculate the sum.<\/li>\n<li>If the axis is not provided, the sum of all the elements is returned. If the axis is a tuple of ints, the sum of all the elements in the given axes is returned.<\/li>\n<li>We can specify dtype to specify the returned output data type.<\/li>\n<li>The out variable is used to specify the array to place the result. It\u2019s an optional parameter.<\/li>\n<li>The keepdims is a boolean parameter. If this is set to True, the axes which are reduced are left in the result as dimensions with size one.<\/li>\n<li>The initial parameter specifies the starting value for the sum.<\/li>\n<\/ul>\n<h2>Python\u306enumpy\u306esum()\u95a2\u6570\u306e\u4f8b\u3092\u4e00\u3064\u793a\u3057\u307e\u3059\u3002<\/h2>\n<p>\u300cnumpy\u306esum()\u95a2\u6570\u306e\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u300d<\/p>\n<h3>\u914d\u5217\u306e\u8981\u7d20\u306e\u5408\u8a08<\/h3>\n<p>sum()\u95a2\u6570\u306b\u914d\u5217\u306e\u307f\u3092\u6e21\u3059\u3068\u3001\u914d\u5217\u304c\u30d5\u30e9\u30c3\u30c8\u5316\u3055\u308c\u3001\u3059\u3079\u3066\u306e\u8981\u7d20\u306e\u5408\u8a08\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\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.sum(array1)\r\nprint(f'Sum of all the elements is {total}')\r\n<\/code><\/pre>\n<p>\u7d50\u679c\uff1a\u5168\u3066\u306e\u8981\u7d20\u306e\u5408\u8a08\u306f21\u3067\u3059\u3002<\/p>\n<h3>\uff12\uff0e\u914d\u5217\u8981\u7d20\u306e\u8ef8\u306b\u6cbf\u3063\u305f\u5408\u8a08<\/h3>\n<p>\u8ef8\u306e\u5024\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u3001\u305d\u306e\u8ef8\u306b\u6cbf\u3063\u305f\u8981\u7d20\u306e\u5408\u8a08\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u914d\u5217\u306e\u5f62\u72b6\u304c(X, Y)\u306e\u5834\u5408\u30010\u8ef8\u306b\u6cbf\u3063\u305f\u5408\u8a08\u306f\u5f62\u72b6(1, Y)\u306b\u306a\u308a\u307e\u3059\u30021\u8ef8\u306b\u6cbf\u3063\u305f\u5408\u8a08\u306f\u5f62\u72b6(1, X)\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\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.sum(array1, axis=0)\r\nprint(f'Sum of elements at 0-axis is {total_0_axis}')\r\n\r\ntotal_1_axis = np.sum(array1, axis=1)\r\nprint(f'Sum of elements at 1-axis is {total_1_axis}')\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Sum of elements at 0-axis is [ 9 12]\r\nSum of elements at 1-axis is [ 3  7 11]\r\n<\/code><\/pre>\n<h3>3. \u5408\u8a08\u306e\u51fa\u529b\u30c7\u30fc\u30bf\u578b\u306e\u6307\u5b9a<\/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\r\ntotal_1_axis = np.sum(array1, axis=1, dtype=float)\r\nprint(f'Sum of elements at 1-axis is {total_1_axis}')\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a1\u8ef8\u306e\u8981\u7d20\u306e\u5408\u8a08\u306f [3. 7.] \u3067\u3059\u3002<\/p>\n<h3>4. \u5408\u8a08\u306e\u521d\u671f\u5024<\/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\r\ntotal_1_axis = np.sum(array1, axis=1, initial=10)\r\nprint(f'Sum of elements at 1-axis is {total_1_axis}')\r\n<\/code><\/pre>\n<p>\u51fa\u529b\u7d50\u679c\uff1a1\u8ef8\u306e\u8981\u7d20\u306e\u5408\u8a08\u306f[13 17]\u3067\u3059\u3002\u53c2\u8003\uff1aAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python numpy\u306esum()\u95a2\u6570\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u8ef8\u306b\u6cbf\u3063\u3066\u914d\u5217\u8981\u7d20\u306e\u5408\u8a08\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 Python\u306enumpy\u306esum()\u95a2\u6570\u306e\u69cb\u6587 Python\u306eNumPy\u306esum()\u30e1\u30bd\u30c3\u30c9\u306e\u69cb\u6587\u306f\u6b21\u306e\u3088\u3046\u306b [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[31,26],"class_list":["post-911","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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