{"id":894,"date":"2023-06-22T06:08:31","date_gmt":"2022-11-25T04:31:49","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/r%e3%81%a7csv%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%83%87%e3%83%bc%e3%82%bf%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e3%81%ab%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80\/"},"modified":"2025-08-01T03:20:14","modified_gmt":"2025-07-31T18:20:14","slug":"r%e3%81%a7csv%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%83%87%e3%83%bc%e3%82%bf%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e3%81%ab%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/r%e3%81%a7csv%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%83%87%e3%83%bc%e3%82%bf%e3%83%95%e3%83%ac%e3%83%bc%e3%83%a0%e3%81%ab%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80\/","title":{"rendered":"R\u3067CSV\u30d5\u30a1\u30a4\u30eb\u3092\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306b\u8aad\u307f\u8fbc\u3080"},"content":{"rendered":"<p>R\u306e\u7279\u5b9a\u306e\u6a5f\u80fd\u306e\u52a9\u3051\u3092\u501f\u308a\u3066\u3001CSV\u30d5\u30a1\u30a4\u30eb\u3092\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306b\u8aad\u307f\u8fbc\u3080\u3053\u3068\u306f\u306f\u308b\u304b\u306b\u7c21\u5358\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>CSV\u30d5\u30a1\u30a4\u30eb\u306f\u4f55\u3067\u3059\u304b\uff1f (CSV\u3075\u3041\u3044\u308b\u306f\u306a\u3093\u3067\u3059\u304b\uff1f)<\/h2>\n<p>CSV\u306fComma, Separated, Values\u306e\u7565\u3067\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3067\u306f\u3001\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u5024\u306f\u30ab\u30f3\u30de\u3067\u533a\u5207\u3089\u308c\u307e\u3059\u3002\u3053\u306e\u30c7\u30fc\u30bf\u306e\u683c\u7d0d\u30d7\u30ed\u30bb\u30b9\u306f\u975e\u5e38\u306b\u7c21\u5358\u3067\u3059\u3002<\/p>\n<hr \/>\n<h2>\u306a\u305cCSV\u304c\u30c7\u30fc\u30bf\u4fdd\u5b58\u306b\u6700\u3082\u4f7f\u7528\u3055\u308c\u308b\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u306a\u306e\u304b\uff1f<\/h2>\n<p>\u591a\u304f\u306e\u4f01\u696d\u3067\u306f\u3001\u30c7\u30fc\u30bf\u3092\u30a8\u30af\u30bb\u30eb\u30b7\u30fc\u30c8\u306b\u4fdd\u5b58\u3059\u308b\u3053\u3068\u304c\u4e00\u822c\u7684\u306a\u65b9\u6cd5\u3067\u3059\u3002\u307b\u3068\u3093\u3069\u306e\u4f01\u696d\u3067\u306f\u3001\u901a\u5e38\u306e\u30b9\u30d7\u30ec\u30c3\u30c9\u30b7\u30fc\u30c8\u4f5c\u6210\u3088\u308a\u3082\u5bb9\u6613\u306a\u30d7\u30ed\u30bb\u30b9\u3067\u3042\u308b\u30b3\u30f3\u30de\u533a\u5207\u308a\u5024\uff08CSV\uff09\u3068\u3057\u3066\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3057\u3066\u3044\u307e\u3059\u3002\u5f8c\u3067\u30c7\u30fc\u30bf\u3092R\u306e\u7d44\u307f\u8fbc\u307f\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u8aad\u307f\u8fbc\u307f\u3001\u5206\u6790\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>R\u306f\u6700\u3082\u4eba\u6c17\u3067\u5f37\u529b\u306a\u7d71\u8a08\u5206\u6790\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3042\u308a\u3001CSV\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u6574\u7406\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306b\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306e\u7279\u5b9a\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<hr \/>\n<h2>CSV\u30d5\u30a1\u30a4\u30eb\u3092\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306b\u8aad\u307f\u8fbc\u3080\u3002<\/h2>\n<p>\u77ed\u3044\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002CSV\u30d5\u30a1\u30a4\u30eb\u3092\u6574\u7406\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306b\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u306e\u6700\u521d\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u3001\u4f5c\u696d\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u53d6\u5f97\u3057\u3066\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3059\u3002CSV\u30d5\u30a1\u30a4\u30eb\u306e\u4f5c\u696d\u30d1\u30b9\u3092\u9078\u629e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>1. \u4f5c\u696d\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u8a2d\u5b9a\u3059\u308b<\/h3>\n<p>\u3053\u3053\u3067\u306f\u3001getwd()\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u4f5c\u696d\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001setwd()\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token operator\">&gt;<\/span>getwd<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">#Shows the default working directory <\/span>\r\n\r\n<span class=\"token operator\">-<\/span><span class=\"token operator\">-<\/span><span class=\"token operator\">-<\/span><span class=\"token operator\">-&gt;<\/span>   <span class=\"token string\">\"C:\/Users\/Dell\/Documents\"<\/span>\r\n\r\n<span class=\"token operator\">&gt;<\/span> setwd<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"C:\\Users\\Dell\\Documents\\R-test data\"<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">#to set the new working Directory<\/span>\r\n\r\n<span class=\"token operator\">&gt;<\/span> getwd<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">#you can see the updated working directory<\/span>\r\n\r\n<span class=\"token operator\">-<\/span><span class=\"token operator\">-<\/span><span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">\"C:\/Users\/Dell\/Documents\/R-test data\"<\/span>\r\n<\/code><\/pre>\n<h3>2. \u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\/CSV\u30d5\u30a1\u30a4\u30eb\u306e\u53d6\u308a\u8fbc\u307f\u3068\u8aad\u307f\u8fbc\u307f<\/h3>\n<p>\u52b4\u50cd\u30d1\u30b9\u306e\u8a2d\u5b9a\u5f8c\u3001\u4ee5\u4e0b\u306b\u793a\u3059\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u307e\u305f\u306fCSV\u30d5\u30a1\u30a4\u30eb\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token operator\">&gt;<\/span> readfile <span class=\"token operator\">&lt;-<\/span> read.csv<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"testdata.txt\"<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>R\u30b9\u30bf\u30b8\u30aa\u3067\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u3001\u4ee5\u4e0b\u306b\u793a\u3059\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u53d6\u5f97\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564a33cdaa94e2bdf7c30f6\/18-0.png\" alt=\"loading csv files in R\" \/><\/div>\n<p>\u5909\u6570\u300creadfile\u300d\u306e\u30af\u30e9\u30b9\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token operator\">&gt;<\/span> class<span class=\"token punctuation\">(<\/span>readfile<span class=\"token punctuation\">)<\/span>\r\n\r\n<span class=\"token operator\">-<\/span><span class=\"token operator\">-<\/span><span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">\"data.frame\"<\/span>            \r\n\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u753b\u50cf\u3067\u306f\u3001\u5b66\u751f\u306e\u540d\u524d\u3001ID\u3001\u5b66\u90e8\u3001\u6027\u5225\u3001\u6210\u7e3e\u306a\u3069\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\uff13\uff0eCSV\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u751f\u5f92\u306e\u60c5\u5831\u3092\u62bd\u51fa\u3059\u308b\u3002<\/h3>\n<p>\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092\u53d6\u5f97\u3057\u305f\u5f8c\u3001\u30c7\u30fc\u30bf\u3092\u5206\u6790\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u304b\u3089\u7279\u5b9a\u306e\u60c5\u5831\u3092\u62bd\u51fa\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5b66\u751f\u304c\u53d6\u5f97\u3057\u305f\u6700\u9ad8\u5f97\u70b9\u3092\u62bd\u51fa\u3059\u308b\u305f\u3081\u306b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token operator\">&gt;<\/span>marks <span class=\"token operator\">&lt;-<\/span> max<span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">$<\/span>Marks.Scored<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">#this will give you the highest marks<\/span>\r\n\r\n<span class=\"token comment\">#To extract the details of a student who scored the highest marks,<\/span>\r\n\r\n<span class=\"token operator\">&gt;<\/span> data <span class=\"token operator\">&lt;-<\/span> read.csv<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"traindata.csv\"<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\n<span class=\"token operator\">&gt;<\/span> Marks <span class=\"token operator\">&lt;-<\/span> max<span class=\"token punctuation\">(<\/span>data<span class=\"token operator\">$<\/span>Marks.Scored<span class=\"token punctuation\">)<\/span>\r\n\r\n<span class=\"token operator\">&gt;<\/span> retval <span class=\"token operator\">&lt;-<\/span> subset<span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">,<\/span> Marks.Scored <span class=\"token operator\">==<\/span> max<span class=\"token punctuation\">(<\/span>Marks.Scored<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>   <span class=\"token comment\">#This will<\/span>\r\n extract the details of the student who secured highest marks \r\n\r\n<span class=\"token operator\">&gt;<\/span> View<span class=\"token punctuation\">(<\/span>retval<span class=\"token punctuation\">)<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564a33cdaa94e2bdf7c30f6\/26-0.png\" alt=\"reading csv files into dataframe in R\" \/><\/div>\n<p>\u300c\u5316\u5b66\u300d\u5b66\u79d1\u306b\u5728\u7c4d\u3057\u3066\u3044\u308b\u5b66\u751f\u306e\u8a73\u7d30\u3092\u62bd\u51fa\u3059\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a00\u3044\u63db\u3048\u307e\u3059\u3002<\/p>\n<p>\u300c\u300e\u5316\u5b66\u300f\u5b66\u79d1\u306b\u5728\u7c4d\u3057\u3066\u3044\u308b\u5b66\u751f\u306e\u8a73\u7d30\u3092\u62bd\u51fa\u3059\u308b\u305f\u3081\u300d<\/p>\n<pre class=\"post-pre\"><code><span class=\"token operator\">&gt;<\/span> readfile <span class=\"token operator\">&lt;-<\/span> read.csv<span class=\"token punctuation\">(<\/span><span class=\"token string\">\"traindata.csv\"<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\n<span class=\"token operator\">&gt;<\/span> retval <span class=\"token operator\">&lt;-<\/span> subset<span class=\"token punctuation\">(<\/span> data<span class=\"token punctuation\">,<\/span> Department <span class=\"token operator\">==<\/span> <span class=\"token string\">\"chemistry\"<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># This will extract the student details who are in Biochemistry department <\/span>\r\n \r\n<span class=\"token operator\">&gt;<\/span> View<span class=\"token punctuation\">(<\/span>retval<span class=\"token punctuation\">)<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564a33cdaa94e2bdf7c30f6\/29-0.png\" alt=\"extracting student information from csv files in R\" \/><\/div>\n<hr \/>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u4f7f\u3063\u3066\u3001read.csv\uff08\u201c 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