{"id":805,"date":"2024-02-09T16:47:30","date_gmt":"2023-08-08T03:27:45","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/r%e7%bc%96%e7%a8%8b%e4%b8%ad%e7%9a%84which%e5%87%bd%e6%95%b0\/"},"modified":"2025-08-03T09:10:29","modified_gmt":"2025-08-03T01:10:29","slug":"r%e7%bc%96%e7%a8%8b%e4%b8%ad%e7%9a%84which%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/r%e7%bc%96%e7%a8%8b%e4%b8%ad%e7%9a%84which%e5%87%bd%e6%95%b0\/","title":{"rendered":"R\u8bed\u8a00which()\u51fd\u6570\u5168\u9762\u89e3\u6790\uff1a\u9ad8\u6548\u6570\u636e\u7b5b\u9009\u4e0e\u4f4d\u7f6e\u7d22\u5f15\u6280\u5de7"},"content":{"rendered":"<p>R\u4e2d\u7684which()\u51fd\u6570\u8fd4\u56de\u6ee1\u8db3\u7ed9\u5b9a\u6761\u4ef6\u7684\u503c\u7684\u4f4d\u7f6e\u6216\u7d22\u5f15\u3002R\u4e2d\u7684Which()\u51fd\u6570\u7ed9\u51fa\u4e86\u903b\u8f91\u5411\u91cf\u4e2d\u8be5\u503c\u7684\u4f4d\u7f6e\u3002\u4f4d\u7f6e\u53ef\u4ee5\u662f\u884c\u3001\u5217\uff0c\u751a\u81f3\u53ef\u4ee5\u662f\u5411\u91cf\u3002<\/p>\n<h2>R\u4e2dwhich()\u51fd\u6570\u7684\u8bed\u6cd5<\/h2>\n<p>which()\uff1aR\u4e2d\u7684which\u51fd\u6570\u8fd4\u56de\u903b\u8f91\u5411\u91cf\u4e2d\u503c\u7684\u4f4d\u7f6e\u3002<\/p>\n<pre class=\"post-pre\"><code>which<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span>arr.ind <span class=\"token operator\">=<\/span> F<span class=\"token punctuation\">,<\/span>useNames <span class=\"token operator\">=<\/span> F<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>x = \u8f93\u5165\u7684\u903b\u8f91\u5411\u91cf\u3002<\/li>\n<li>arr.ind = \u5982\u679cx\u662f\u6570\u7ec4\uff0c\u5219\u8fd4\u56de\u6570\u7ec4\u7d22\u5f15\u3002<\/li>\n<li>useNames = \u8868\u793a\u6570\u7ec4\u7684\u7ef4\u5ea6\u540d\u79f0\u3002<\/li>\n<\/ul>\n<h2>which()\u51fd\u6570\u7684\u7b80\u5355\u793a\u4f8b<\/h2>\n<p>\u597d\u7684\uff0c\u4f60\u5f97\u5230\u4e86which\u51fd\u6570\u7684\u5b9a\u4e49\u4ee5\u53ca\u5b83\u7684\u5de5\u4f5c\u6027\u8d28\u3002\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u628a\u5b66\u5230\u7684\u4e1c\u897f\u5b9e\u9645\u5e94\u7528\u8d77\u6765\u3002<\/p>\n<p>\u6211\u4eec\u770b\u770b\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code>which<span class=\"token punctuation\">(<\/span>letters<span class=\"token operator\">==<\/span><span class=\"token string\">\"p\"<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>16<\/p>\n<pre class=\"post-pre\"><code>which<span class=\"token punctuation\">(<\/span>letters<span class=\"token operator\">==<\/span><span class=\"token string\">\"n\"<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>14<\/p>\n<pre class=\"post-pre\"><code>which<span class=\"token punctuation\">(<\/span>letters<span class=\"token operator\">==<\/span><span class=\"token string\">\"l\"<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>12<\/p>\n<p>&#8220;letters&#8221; \u662f\u4e00\u4e2a\u5185\u7f6e\u5e38\u91cf\uff0c\u5305\u542b\u4e86\u82f1\u8bed\u5b57\u6bcd\u8868\u768426\u4e2a\u5b57\u6bcd\uff0c\u6309\u987a\u5e8f\u8fdb\u884c\u6392\u5217\u3002<\/p>\n<p>\u4f60\u5728\u4e0a\u9762\u770b\u5230\u7684\u8f93\u51fa\u8868\u793a\u4e86\u6570\u636e\u6846\u4e2d\u6bcf\u4e2a\u5b57\u6bcd\u5728\u5b57\u6bcd\u8868\u4e2d\u7684\u4f4d\u7f6e\u3002\u6b63\u5982\u4f60\u6240\u89c1\uff0c\u5b57\u6bcd&#8221;p&#8221;\u5728\u5b57\u6bcd\u8868\u4e2d\u6392\u7b2c16\u4f4d\uff0c\u800c&#8221;l&#8221;\u548c&#8221;n&#8221;\u5206\u522b\u6392\u5728\u7b2c12\u4f4d\u548c\u7b2c14\u4f4d\u3002<\/p>\n<p>\u73b0\u5728\u8ba9\u6211\u4eec\u5b66\u4e60\u5982\u4f55\u4f7f\u7528which\u51fd\u6570\u3002<\/p>\n<h2>\u4f7f\u7528which()\u51fd\u6570\u4e0e\u5411\u91cf\u8fdb\u884c\u64cd\u4f5c<\/h2>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u4f7f\u7528R\u8bed\u8a00\u521b\u5efa\u4e00\u4e2a\u5411\u91cf\uff0c\u7136\u540e\u901a\u8fc7\u4f7f\u7528which\u51fd\u6570\u8fdb\u884c\u4f4d\u7f6e\u8ddf\u8e2a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token comment\">#\u521b\u5efa\u4e00\u4e2a\u5411\u91cf<\/span>\r\ndf<span class=\"token operator\"><-<\/span>c<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"token comment\">#5\u7684\u4f4d\u7f6e<\/span>\r\nwhich<span class=\"token punctuation\">(<\/span>df<span class=\"token operator\">==<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>1<\/p>\n<pre class=\"post-pre\"><code><span class=\"token comment\">#1\u7684\u4f4d\u7f6e<\/span>\r\nwhich<span class=\"token punctuation\">(<\/span>df<span class=\"token operator\">==<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>5<\/p>\n<pre class=\"post-pre\"><code><span class=\"token comment\">#\u5927\u4e8e2\u7684\u503c\u7684\u4f4d\u7f6e<\/span>\r\nwhich<span class=\"token punctuation\">(<\/span>df<span class=\"token operator\">><\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>1 2 3<\/p>\n<p>\u592a\u597d\u4e86\uff01\u5728R\u4e2d\u7684which()\u51fd\u6570\u8fd4\u56de\u7ed9\u5b9a\u8f93\u5165\u503c\u7684\u4f4d\u7f6e\u3002\u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u51fd\u6570\u6765\u4f20\u9012\u7279\u5b9a\u7684\u6761\u4ef6\uff0c\u5e76\u5f97\u5230\u4e0e\u6761\u4ef6\u5339\u914d\u7684\u8f93\u51fa\u4f4d\u7f6e\uff0c\u5c31\u50cf\u6211\u4eec\u5728\u4e0a\u4e00\u4e2a\u4f8b\u5b50\u4e2d\u770b\u5230\u7684\u90a3\u6837\u3002<\/p>\n<h2>\u5728\u6570\u636e\u6846\u4e2d\u4f7f\u7528which()\u51fd\u6570<\/h2>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u5728R\u8bed\u8a00\u4e2d\u5c06which\u51fd\u6570\u5e94\u7528\u4e8e\u6570\u636e\u6846\u3002<\/p>\n<pre class=\"post-pre\"><code>df<span class=\"token operator\"><-<\/span>datasets<span class=\"token operator\">::<\/span>BOD\r\ndf\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>    Time  demand\r\n1    1    8.3\r\n2    2   10.3\r\n3    3   19.0\r\n4    4   16.0\r\n5    5   15.6\r\n6    7   19.8\r\n<\/code><\/pre>\n<p>\u4e3a\u6b64\uff0c\u6211\u4eec\u4f7f\u7528\u4e86BOD\u6570\u636e\u96c6\uff0c\u8be5\u6570\u636e\u96c6\u5305\u542b\u4e24\u5217\uff0c\u5373\u65f6\u95f4\u548c\u9700\u6c42\u3002\u8fd9\u662f\u53e6\u4e00\u4e2a\u5185\u7f6e\u6570\u636e\u96c6\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u4f7f\u7528 which \u51fd\u6570\uff0c\u5e76\u5c1d\u8bd5\u627e\u51fa\u6570\u636e\u4e2d\u503c\u7684\u4f4d\u7f6e\u3002<\/p>\n<pre class=\"post-pre\"><code>which<span class=\"token punctuation\">(<\/span>df<span class=\"token operator\">$<\/span>demand<span class=\"token operator\">==<\/span><span class=\"token string\">'10.3'<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>2\r\n<\/code><\/pre>\n<p>\u60a8\u8fd8\u53ef\u4ee5\u5c06\u4e00\u7cfb\u5217\u6570\u503c\u8f93\u5165which()\u51fd\u6570\u4e2d\u3002\u770b\u4e0b\u9762\u7684\u793a\u4f8b\uff0c\u6211\u6b63\u5728\u5c1d\u8bd5\u4ece\u6570\u636e\u6846\u4e2d\u627e\u5230\u4e24\u4e2a\u6570\u503c\u7684\u4f4d\u7f6e\u3002<\/p>\n<pre class=\"post-pre\"><code>which<span class=\"token punctuation\">(<\/span>df<span class=\"token operator\">$<\/span>demand<span class=\"token operator\">==<\/span>c<span class=\"token punctuation\">(<\/span><span class=\"token number\">8.3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">16.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>1    4\r\n<\/code><\/pre>\n<h2>\u4f7f\u7528which()\u51fd\u6570\u67e5\u627e\u6570\u636e\u6846\u4e2d\u5177\u6709\u6570\u503c\u7684\u5217<\/h2>\n<p>\u751a\u81f3\u53ef\u4ee5\u4f7f\u7528which()\u51fd\u6570\u5728\u5305\u542b\u6570\u503c\u6570\u636e\u7684\u6570\u636e\u4e2d\u67e5\u627e\u5217\u540d\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u770b\u770b\u5728R\u8bed\u8a00\u4e2d\u5982\u4f55\u8fd0\u4f5c\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u4f7f\u7528\u4e86&#8221;\u9e22\u5c3e\u82b1&#8221;\u6570\u636e\u96c6\u3002<\/p>\n<pre class=\"post-pre\"><code>df<span class=\"token operator\"><-<\/span>datasets<span class=\"token operator\">::<\/span>iris\r\ndf\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>   Sepal.Length  Sepal.Width   Petal.Length   Petal.Width  Species\r\n1            5.1         3.5          1.4         0.2     setosa\r\n2            4.9         3.0          1.4         0.2     setosa\r\n3            4.7         3.2          1.3         0.2     setosa\r\n4            4.6         3.1          1.5         0.2     setosa\r\n5            5.0         3.6          1.4         0.2     setosa\r\n6            5.4         3.9          1.7         0.4     setosa\r\n7            4.6         3.4          1.4         0.3     setosa\r\n8            5.0         3.4          1.5         0.2     setosa\r\n9            4.4         2.9          1.4         0.2     setosa\r\n10           4.9         3.1          1.5         0.1     setosa\r\n11           5.4         3.7          1.5         0.2     setosa\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>test<span class=\"token operator\"><-<\/span>which<span class=\"token punctuation\">(<\/span>sapply<span class=\"token punctuation\">(<\/span>df<span class=\"token punctuation\">,<\/span>is.numeric<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\ncolnames<span class=\"token punctuation\">(<\/span>df<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span>test<span class=\"token punctuation\">]<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>\"Sepal.Length\" \"Sepal.Width\"  \"Petal.Length\" \"Petal.Width\" \r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u663e\u793a\uff0c\u8679\u819c\u6570\u636e\u96c6\u4e2d\u67095\u4e2a\u5217\u3002\u5176\u4e2d\uff0c4\u4e2a\u662f\u6570\u503c\u5217\uff0c1\u4e2a\u662f\u5206\u7c7b\u5217\uff08\u7269\u79cd\uff09\u3002<\/p>\n<p>\u6211\u4eec\u5728R\u4e2d\u4f7f\u7528\u4e86sapply\u51fd\u6570\u548cwhich()\u65b9\u6cd5\u3002<\/p>\n<p>\u5982\u679c\u60a8\u662f\u6570\u636e\u5206\u6790\u5e08\uff0c\u90a3\u4e48which()\u51fd\u6570\u5c06\u4f1a\u5bf9\u60a8\u975e\u5e38\u6709\u4ef7\u503c\uff0c\u5b83\u6839\u636e\u8f93\u5165\u6761\u4ef6\u4ec5\u8fd4\u56de\u6570\u5b57\u5217\u7684\u540d\u79f0\u3002<\/p>\n<h2>\u5728\u77e9\u9635\u4e2d\u4f7f\u7528which()\u51fd\u6570<\/h2>\n<p>\u6700\u540e\uff0c\u6211\u4eec\u5df2\u7ecf\u5230\u8fbe\u4e86R\u4e2d\u7684\u77e9\u9635\u3002\u5728R\u8bed\u8a00\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528which()\u51fd\u6570\u6765\u83b7\u53d6\u77e9\u9635\u4e2d\u503c\u7684\u4f4d\u7f6e\u3002\u5728\u672c\u7ae0\u8282\u4e2d\uff0c\u60a8\u8fd8\u5c06\u4e86\u89e3\u5230arr.ind\u53c2\u6570\u7684\u7528\u6cd5\u3002<\/p>\n<p>\u9996\u5148\u8981\u505a\u7684\u4e8b\u60c5\u5c31\u662f\u5efa\u7acb\u4e00\u4e2a\u77e9\u9635\u3002<\/p>\n<pre class=\"post-pre\"><code>df<span class=\"token operator\"><-<\/span>matrix<span class=\"token punctuation\">(<\/span>rep<span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>nrow <span class=\"token operator\">=<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span>\r\ndf\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>       [,1] [,2] [,3]\r\n[1,]    1    0    1\r\n[2,]    0    1    1\r\n[3,]    1    1    0\r\n[4,]    1    0    1\r\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u4f7f\u7528which()\u51fd\u6570\u6765\u83b7\u53d6\u77e9\u9635\u4e2d\u503c\u4e3a&#8217;0&#8217;\u7684\u4f4d\u7f6e\u3002<\/p>\n<pre class=\"post-pre\"><code>which<span class=\"token punctuation\">(<\/span>df<span class=\"token operator\">==<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>arr.ind <span class=\"token operator\">=<\/span> T<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>      row col\r\n[1,]   2   1\r\n[2,]   1   2\r\n[3,]   4   2\r\n[4,]   3   3\r\n<\/code><\/pre>\n<p>\u597d\u7684\uff0cwhich\u51fd\u6570\u5df2\u7ecf\u8fd4\u56de\u4e86\u77e9\u9635\u4e2d\u503c\u4e3a&#8217;0&#8217;\u7684\u4f4d\u7f6e\u3002<\/p>\n<p>&#8220;0&#8221;\u7684\u7b2c\u4e00\u6b21\u51fa\u73b0\u662f\u5728\u7b2c\u4e8c\u884c\u7b2c\u4e00\u5217\u3002\u7136\u540e\u4e0b\u4e00\u6b21\u51fa\u73b0\u5728\u7b2c\u4e00\u884c\u7b2c\u4e8c\u5217\u3002\u63a5\u7740\uff0c\u662f\u5728\u7b2c\u56db\u884c\u7b2c\u4e8c\u5217\u3002\u6700\u540e\uff0c\u662f\u5728\u7b2c\u4e09\u884c\u7b2c\u4e09\u5217\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5728\u6570\u636e\u5206\u6790\u548c\u6316\u6398\u4e2d\uff0cR\u8bed\u8a00\u4e2d\u7684which()\u51fd\u6570\u662f\u6700\u5e38\u7528\u7684\u51fd\u6570\u4e4b\u4e00\u3002<\/p>\n<p>\u8fd9\u4e2a\u51fd\u6570\u7ed9\u51fa\u4e86\u6570\u636e\u4e2d\u6570\u503c\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u4f60\u6b63\u5728\u5904\u7406\u5927\u91cf\u7684\u6570\u636e\uff0c\u90a3\u4e48\u5728\u5176\u4e2d\u627e\u5230\u7279\u5b9a\u6570\u503c\u7684\u4f4d\u7f6e\u5c06\u53d8\u5f97\u56f0\u96be\uff0c\u8fd9\u5c31\u662f R \u4e2d\u7684 which() \u51fd\u6570\u53d1\u6325\u4f5c\u7528\u7684\u5730\u65b9\u3002<\/p>\n<p>\u73b0\u5728\u5c31\u8fd9\u6837\u5427\u3002\u795d\u60a8\u5b9a\u4f4d\u6109\u5feb\uff01<\/p>\n<p>\u66f4\u591a\u9605\u8bfb\uff1aR\u6587\u6863<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R\u4e2d\u7684which()\u51fd\u6570\u8fd4\u56de\u6ee1\u8db3\u7ed9\u5b9a\u6761\u4ef6\u7684\u503c\u7684\u4f4d\u7f6e\u6216\u7d22\u5f15\u3002R\u4e2d\u7684Which()\u51fd\u6570\u7ed9\u51fa\u4e86\u903b\u8f91\u5411\u91cf\u4e2d\u8be5\u503c\u7684\u4f4d\u7f6e\u3002 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2137,586,2135,567,2136],"class_list":{"0":"post-805","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-r","9":"tag-which","10":"tag-567","11":"tag-2136"},"yoast_head":"<!-- This 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