{"id":71841,"date":"2018-09-11T15:21:33","date_gmt":"2018-09-11T06:21:33","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=71841"},"modified":"2024-05-06T11:51:44","modified_gmt":"2024-05-06T02:51:44","slug":"%e3%80%90numpy%e5%85%a5%e9%96%80-dtype%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/71841","title":{"rendered":"\u3010NumPy\u5165\u9580 np.dtype\u3011 \u914d\u5217\u8981\u7d20\u306e\u578b\u3092\u78ba\u8a8d\u30fb\u6307\u5b9a\u3057\u3066\u307f\u3088\u3046"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3001<a href=\"https:\/\/lp.sejuku.net\/lp1_blog_01\/?cid=ai_btn1_71841\">\u30a4\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc<\/a>\u306e\u30d5\u30af\u30ed\u30a6\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f<span style=\"color: #0000ff;\"><strong>np.ndarray\u306e\u8981\u7d20\u306e\u578b\u3092\u78ba\u8a8d<\/strong><\/span>\u3057\u305f\u308a\u3001<span style=\"color: #0000ff;\"><strong>\u8a2d\u5b9a<\/strong><\/span>\u3059\u308b\u305f\u3081\u306e\u30d1\u30e9\u30e1\u30fc\u30bf<span style=\"color: #008000;\"><strong>\u300cdtype\u300d<\/strong><\/span>\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\uff01<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9<\/p>\n<ol>\n<li><span style=\"color: #0000ff;\"><strong>dtype\u3092\u4f7f\u3063\u305f\u914d\u5217\u8981\u7d20\u306e\u578b\u306e\u78ba\u8a8d<\/strong><\/span><\/li>\n<li><span style=\"color: #0000ff;\"><strong>dtype\u3092\u4f7f\u3063\u305f\u578b\u6307\u5b9a\u3092\u3057\u305f\u914d\u5217\u306e\u521d\u671f\u5316<\/strong><\/span><\/li>\n<li><span style=\"color: #0000ff;\"><strong>astype\u3092\u4f7f\u3063\u305f\u6392\u5217\u8981\u7d20\u306e\u30ad\u30e3\u30b9\u30c8\u5909\u63db<\/strong><\/span><\/li>\n<\/ol>\n\n<h2 id=\"NumPy%E3%81%AEdtype%EF%BC%88%E3%83%87%E3%83%BC%E3%82%BF%E5%9E%8B%EF%BC%89%E4%B8%80%E8%A6%A7\">NumPy\u306edtype\uff08\u30c7\u30fc\u30bf\u578b\uff09\u4e00\u89a7<\/h2>\n<p>np.ndarray\u306e<span style=\"color: #0000ff;\"><strong>\u8981\u7d20\u3068\u3057\u3066\u4f7f\u3048\u308b\u4e3b\u306a\u578b<\/strong><\/span>\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"lang:python decode:true\">import numpy as np\r\n\r\ndtypes = [\r\n    np.int8,        # \u7b26\u53f7\u3042\u308a  8bit \u6574\u6570 \r\n    np.int16,       # \u7b26\u53f7\u3042\u308a 16bit \u6574\u6570\r\n    np.int32,       # \u7b26\u53f7\u3042\u308a 32bit \u6574\u6570\r\n    np.int64,       # \u7b26\u53f7\u3042\u308a 64bit \u6574\u6570\r\n    np.uint8,       # \u7b26\u53f7\u306a\u3057  8bit \u6574\u6570\r\n    np.uint16,      # \u7b26\u53f7\u306a\u3057 16bit \u6574\u6570\r\n    np.uint32,      # \u7b26\u53f7\u306a\u3057 32bit \u6574\u6570\r\n    np.uint64,      # \u7b26\u53f7\u306a\u3057 64bit \u6574\u6570\r\n    np.float16,     # \u3000\u534a\u7cbe\u5ea6 \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\r\n    np.float32,     # \u3000\u5358\u7cbe\u5ea6 \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\r\n    np.float64,     # \u3000\u500d\u7cbe\u5ea6 \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\r\n    np.float128,    # \u56db\u500d\u7cbe\u5ea6 \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570 \r\n    np.complex64,   # \u8907\u7d20\u6570 (\u5b9f\u6570\u30fb\u865a\u6570\u304c  float32)\r\n    np.complex128,  # \u8907\u7d20\u6570 (\u5b9f\u6570\u30fb\u865a\u6570\u304c  float64)\r\n    np.complex256,  # \u8907\u7d20\u6570 (\u5b9f\u6570\u30fb\u865a\u6570\u304c float128)\r\n    np.bool,        # \u771f\u507d\u5024\r\n    np.unicode,     # Unicode\u6587\u5b57\u5217\r\n    np.object       # Python\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u3078\u306e\u30dd\u30a4\u30f3\u30bf\uff09\r\n]<\/pre>\n<div class=\"p-Widget jp-Cell jp-MarkdownCell jp-Notebook-cell jp-mod-rendered jp-mod-active jp-mod-selected\">\n<div class=\"p-Widget p-Panel jp-Cell-inputWrapper\">\n<div class=\"p-Widget jp-InputArea jp-Cell-inputArea\">\n<div class=\"p-Widget jp-RenderedHTMLCommon jp-RenderedMarkdown jp-MarkdownOutput\" data-mime-type=\"text\/markdown\">\n<p>\u6574\u6570\u3084\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3060\u3051\u3067\u306a\u304f\u3001\u771f\u507d\u5024\u3084\u6587\u5b57\u5217\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><span style=\"color: #0000ff;\"><strong>np.ndarray\u306e\u4e2d\u8eab\u306f\u540c\u3058\u578b<\/strong><\/span>\u3067\u3042\u308b\u3053\u3068\u304c\u6c42\u3081\u3089\u308c\u308b\u306e\u3067\u3001Python\u306elist\u306e\u3088\u3046\u306b\u3044\u308d\u3093\u306a\u578b\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5165\u3063\u3066\u3044\u308b\u3088\u3046\u306a\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3088\uff01<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"p-Widget jp-Cell jp-MarkdownCell jp-Notebook-cell jp-mod-rendered\">\n<div class=\"p-Widget p-Panel jp-Cell-inputWrapper\">\n<div class=\"p-Widget jp-InputArea jp-Cell-inputArea\">\n<div class=\"p-Widget jp-RenderedHTMLCommon jp-RenderedMarkdown jp-MarkdownOutput\" data-mime-type=\"text\/markdown\">\n<h2 id=\"dtype%E3%81%AE%E4%BD%BF%E3%81%84%E6%96%B9\">dtype\u306e\u4f7f\u3044\u65b9<\/h2>\n<p>\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001NumPy\u306e\u578b\u306b\u307e\u3064\u308f\u308b\u6a5f\u80fd\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3 id=\"np.ndarray.dtype%E3%81%A7%E9%85%8D%E5%88%97%E3%81%AE%E8%A6%81%E7%B4%A0%E3%81%AE%E5%9E%8B%E3%82%92%E7%A2%BA%E8%AA%8D\">np.ndarray.dtype\u3067\u914d\u5217\u306e\u8981\u7d20\u306e\u578b\u3092\u78ba\u8a8d<\/h3>\n<p>\u914d\u5217\u8981\u7d20\u306e\u578b\u304c\u78ba\u8a8d\u3057\u305f\u3044\u3068\u8a00\u3046\u3068\u304d\u306b<span style=\"color: #0000ff;\"><strong>\u3001type(arr)\u3068\u3057\u3066\u3082\u300cnumpy.ndarray\u300d\u3068\u8fd4\u3055\u308c\u308b<\/strong><\/span>\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>np.ndarray\u306e<span style=\"color: #0000ff;\"><strong>\u8981\u7d20\u306e\u578b\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f\u3001dtype\u306b\u30a2\u30af\u30bb\u30b9<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:python decode:true\">intarr = np.array([1,2,3])\r\nboolarr = np.array([True, False, True])\r\npyarr = np.array([[], {}, [1,2]])\r\n\r\nprint(intarr.dtype,\r\n      boolarr.dtype,\r\n      pyarr.dtype\r\n     )\r\n\r\n# \u51fa\u529b\u7d50\u679c\r\nint64 bool object<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>\u884c\u5217\u8a08\u7b97\uff08\u4f8b\u3048\u3070\u5185\u7a4d\uff09\u3092\u3059\u308b\u3068\u304d\u306b\u3001\u3067\u304d\u308c\u3070\u8a08\u7b97\u306b\u4f7f\u3046\u914d\u5217\u306edtype\u306f\u5408\u308f\u305b\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u305d\u3046\u3067\u306a\u3044\u3068\u3001\u610f\u56f3\u3057\u306a\u3044\u30ad\u30e3\u30b9\u30c8\u5909\u63db\u304c\u8d77\u3053\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u4e8b\u524d\u306bdtype\u306a\u3069\u3067\u578b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304a\u304f\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n<div class=\"p-Widget jp-Cell jp-MarkdownCell jp-Notebook-cell jp-mod-rendered\">\n<div class=\"p-Widget p-Panel jp-Cell-inputWrapper\">\n<div class=\"p-Widget jp-InputArea jp-Cell-inputArea\">\n<div class=\"p-Widget jp-RenderedHTMLCommon jp-RenderedMarkdown jp-MarkdownOutput\" data-mime-type=\"text\/markdown\">\n<h3 id=\"%E9%85%8D%E5%88%97%E3%82%92%E5%88%9D%E6%9C%9F%E5%8C%96%E3%81%99%E3%82%8B%E9%9A%9B%E3%81%ABdtype%E3%81%A7%E5%9E%8B%E3%82%92%E6%8C%87%E5%AE%9A\">\u914d\u5217\u3092\u521d\u671f\u5316\u3059\u308b\u969b\u306bdtype\u3067\u578b\u3092\u6307\u5b9a<\/h3>\n<p><span style=\"color: #0000ff;\"><strong>np.ndarray\u3092\u4f5c\u308b\u969b\u306b\u3001dtype\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6307\u5b9a<\/strong><\/span>\u3059\u308b\u3053\u3068\u3067<span style=\"color: #0000ff;\"><strong>\u914d\u5217\u306e\u8981\u7d20\u306e\u578b\u3092\u6307\u5b9a<\/strong><\/span>\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:python decode:true\">int16arr = np.array([1,2,3], dtype=np.int16)\r\nfloat32arr = np.array([1,2,3], dtype=np.float32)\r\ncomplex256arr = np.array([1+2j, 2-3j], dtype=np.complex256)\r\n\r\nprint(int16arr.dtype,\r\n      float32arr.dtype,\r\n      pyarr.dtype\r\n     )\r\n\r\n# \u51fa\u529b\u7d50\u679c\r\nint16 float32 object<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>\u30d5\u30a1\u30a4\u30eb\uff08\u4f8b\u3048\u3070CSV\u30d5\u30a1\u30a4\u30eb\uff09\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u3068\u304d\u3001\u8aad\u307f\u8fbc\u3093\u3060\u30c7\u30fc\u30bf\u3092\u610f\u56f3\u3057\u305f\u30c7\u30fc\u30bf\u578b\u306b\u3057\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3093\u306a\u3068\u304d\u3001np.ndarray\u3092\u4f5c\u308b\u3068\u304d\u306bdtype\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6307\u5b9a\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<div class=\"p-Widget jp-Cell jp-MarkdownCell jp-Notebook-cell jp-mod-rendered\">\n<div class=\"p-Widget p-Panel jp-Cell-inputWrapper\">\n<div class=\"p-Widget jp-InputArea jp-Cell-inputArea\">\n<div class=\"p-Widget jp-RenderedHTMLCommon jp-RenderedMarkdown jp-MarkdownOutput\" data-mime-type=\"text\/markdown\">\n<h2 id=\"np.ndarray.astype%E3%81%A7%E9%85%8D%E5%88%97%E3%81%AE%E8%A6%81%E7%B4%A0%E3%81%AE%E5%9E%8B%E3%82%92%E5%A4%89%E6%9B%B4\">np.ndarray.astype\u3067\u914d\u5217\u306e\u8981\u7d20\u306e\u578b\u3092\u5909\u66f4<\/h2>\n<p>np.ndarray\u306b\u306f<span style=\"color: #008000;\"><strong>astype\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u3066\u3001\u3053\u308c\u3092\u4f7f\u3046\u3068<span style=\"color: #0000ff;\"><strong>\u65e2\u5b58\u306e\u914d\u5217\u306e\u8981\u7d20\u306e\u578b\u3092\u5909\u3048\u305f\u65b0\u3057\u3044\u914d\u5217\u304c\u4f5c\u308c\u307e\u3059<\/strong><\/span>\u3002<\/p>\n<p>\u203b\u5909\u66f4\u3057\u305f\u3044\u914d\u5217\u81ea\u4f53\u306e\u578b\u304c\u5909\u308f\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\uff01<\/p>\n<pre class=\"lang:python decode:true\">int16arr_ = int16arr.astype(np.float16)\r\nfloat32arr_ = float32arr.astype(np.float128)\r\ncomplex256arr_ = complex256arr.astype(np.complex64)\r\n\u200b\r\nprint(int16arr_, int16arr_.dtype)\r\nprint(float32arr_, float32arr_.dtype)\r\nprint(complex256arr_, complex256arr_.dtype)\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>[\u51fa\u529b\u7d50\u679c]<\/p>\n<pre class=\"\">[1. 2. 3.] float16\r\n[1. 2. 3.] float128\r\n[1.+2.j 2.-3.j] complex64<\/pre>\n<p>scikit-learn\u3067\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u8aad\u307f\u8fbc\u3093\u3060\u3068\u304d\u3001\u30c7\u30fc\u30bf\u304c\u65e2\u306bnp.ndarray\u306b\u306a\u3063\u3066\u3044\u308b\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u8aad\u307f\u8fbc\u3093\u3060\u914d\u5217\u304c\u610f\u56f3\u3057\u306a\u3044\u30c7\u30fc\u30bf\u578b\u306b\u306a\u3063\u3066\u3044\u305f\u306a\u3089\u3070\u3001astype\u30e1\u30bd\u30c3\u30c9\u3067\u30c7\u30fc\u30bf\u578b\u3092\u5909\u66f4\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<span style=\"color: #0000ff;\"><strong>NumPy\u306e\u914d\u5217\u306e\u578b\u3092\u8a2d\u5b9a\u30fb\u78ba\u8a8d\u3059\u308bdtype\u30d1\u30e9\u30e1\u30fc\u30bf<\/strong><\/span>\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u52b9\u7387\u7684\u306a\u884c\u5217\u8a08\u7b97\u3092\u884c\u3046\u306b\u306f\u3001\u914d\u5217\u8981\u7d20\u306e\u30c7\u30fc\u30bf\u578b\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u5927\u5207\u3067\u3059\uff01<\/p>\n<p>type\u95a2\u6570\u3067\u306f\u914d\u5217\u306e\u8981\u7d20\u306e\u578b\u307e\u3067\u306f\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u3001dtype\u3092\u9069\u5207\u306b\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3001\u30a4\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u306e\u30d5\u30af\u30ed\u30a6\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306fnp.ndarray\u306e\u8981\u7d20\u306e\u578b\u3092\u78ba\u8a8d\u3057\u305f\u308a\u3001\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u300cdtype\u300d\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\uff01 \u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9 dtype\u3092\u4f7f\u3063\u305f\u914d\u5217\u8981\u7d20\u306e\u578b\u306e\u78ba\u8a8d dty [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":71983,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2350],"tags":[1888],"class_list":["post-71841","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python-study","tag-ai-python-numpy"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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