{"id":471,"date":"2023-07-29T19:32:18","date_gmt":"2023-07-29T19:32:18","guid":{"rendered":"https:\/\/statorials.org\/cn\/r-max-%e5%af%b9%e5%9b%a0%e5%ad%90%e4%b8%8d%e6%98%be%e7%9d%80\/"},"modified":"2023-07-29T19:32:18","modified_gmt":"2023-07-29T19:32:18","slug":"r-max-%e5%af%b9%e5%9b%a0%e5%ad%90%e4%b8%8d%e6%98%be%e7%9d%80","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r-max-%e5%af%b9%e5%9b%a0%e5%ad%90%e4%b8%8d%e6%98%be%e7%9d%80\/","title":{"rendered":"R \u4e2d\u9519\u8bef\u7684\u89e3\u91ca\uff1a\u201cmax\u201d\u5bf9\u4e8e\u56e0\u5b50\u800c\u8a00\u4e0d\u663e\u7740"},"content":{"rendered":"

<\/p>\n

\n

\u6709\u65f6\uff0c\u60a8\u53ef\u80fd\u4f1a\u5728 R \u4e2d\u9047\u5230\u4ee5\u4e0b\u9519\u8bef\uff1a<\/span><\/p>\n

 'max' not meaningful for factors<\/strong><\/pre>\n
\u8fd9\u53ea\u662f\u8868\u660e\u60a8\u6b63\u5728\u5c1d\u8bd5\u83b7\u53d6\u5c5e\u4e8e\u7c7b\u56e0\u5b50\u7684<\/strong>\u53d8\u91cf\u7684\u201c\u6700\u5927\u503c\u201d\u3002<\/span><\/p>\n
\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u5c1d\u8bd5\u53d6\u4ee5\u4e0b\u5411\u91cf\u7684\u6700\u5927\u503c\uff0c\u5c31\u4f1a\u751f\u6210\u6b64\u9519\u8bef\uff1a<\/span><\/p>\n
 #create a vector of class vector\n<\/em><\/span>factor_vector <- as.factor(c(1, 7, 12, 14, 15))\n\n#attempt to find max value in the vector<\/span>\nmax(factor_vector)\n\n#Error in Summary.factor(1:5, na.rm = FALSE): \n# 'max' not meaningful for factors<\/strong><\/pre>\n
\u6839\u636e\u5b9a\u4e49\uff0c\u56e0\u5b50\u5411\u91cf\u7684\u503c\u5c5e\u4e8e\u540d\u4e49\u7c7b\uff0c\u8fd9\u610f\u5473\u7740\u8fd9\u4e9b\u503c\u6ca1\u6709\u6709\u610f\u4e49\u7684\u987a\u5e8f\u3002\u6240\u4ee5\u6ca1\u6709\u627e\u5230\u201c\u6700\u5927\u503c\u201d\u3002<\/span><\/p>\n
\u67e5\u627e\u56e0\u5b50\u5411\u91cf\u6700\u5927\u503c\u7684\u4e00\u4e2a\u7b80\u5355\u89e3\u51b3\u65b9\u6848\u662f\u5c06\u5176\u7b80\u5355\u5730\u8f6c\u6362\u4e3a\u5b57\u7b26\u5411\u91cf\uff0c\u7136\u540e\u8f6c\u6362\u4e3a\u6570\u5b57\u5411\u91cf\uff1a<\/span><\/p>\n
 #convert factor vector to numeric vector and find the max value<\/span>\nnew_vector <- as.numeric(as.character(factor_vector))\nmax(new_vector)\n\n#[1] 15<\/strong><\/pre>\n
\u5982\u679c\u60a8\u7684\u56e0\u5b50\u5411\u91cf\u4ec5\u5305\u542b\u56e0\u5b50\u540d\u79f0\uff0c\u5219\u5373\u4f7f\u5728\u5c06\u56e0\u5b50\u5411\u91cf\u8f6c\u6362\u4e3a\u6570\u503c\u5411\u91cf\u4e4b\u540e\u4e5f\u4e0d\u53ef\u80fd\u627e\u5230\u6700\u5927\u503c\uff0c\u56e0\u4e3a\u627e\u5230\u56e0\u5b50\u5217\u8868\u7684\u201c\u6700\u5927\u503c\u201d\u662f\u6ca1\u6709\u610f\u4e49\u7684\u3002\u540d\u79f0\u3002<\/span><\/p>\n
 #create factor vector with names of factors<\/span>\nfactor_vector <- as.factor(c(\"first\", \"second\", \"third\"))\n\n#attempt to convert factor vector into numeric vector and find max value\n<\/span>new_vector <- as.numeric(as.character(factor_vector))\nmax(new_vector)\n\n#Warning message:\n#NAs introduced by coercion \n#[1] NA<\/strong><\/pre>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cR \u53ef\u4ee5\u627e\u5230\u6700\u5927\u6570\u5411\u91cf\u3001\u65e5\u671f\u5411\u91cf\u548c\u5b57\u7b26\u5411\u91cf\uff0c\u800c\u4e0d\u4f1a\u9047\u5230\u95ee\u9898\uff1a<\/span><\/p>\n
 numeric_vector <- c(1, 2, 12, 14)\nmax(numeric_vector)\n\n#[1] 14\n\ncharacter_vector <- c(\"a\", \"b\", \"f\")\nmax(character_vector)\n\n#[1] \u201cf\u201d\n\ndate_vector <- as.Date(c(\"2019-01-01\", \"2019-03-05\", \"2019-03-04\"))\nmax(date_vector)\n\n#[1] \"2019-03-05\"\n<\/strong><\/pre>\n
\u56e0\u6b64\uff0c\u5982\u679c\u60a8\u8bd5\u56fe\u627e\u5230\u5411\u91cf\u4e2d\u7684\u6700\u5927\u503c\uff0c\u53ea\u9700\u786e\u4fdd\u60a8\u7684\u5411\u91cf\u4e0d\u662fFactor<\/strong>\u7c7b\u578b\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
\u6709\u65f6\uff0c\u60a8\u53ef\u80fd\u4f1a\u5728 R \u4e2d\u9047\u5230\u4ee5\u4e0b\u9519\u8bef\uff1a ‘max’ not meaningful for factors \u8fd9\u53ea […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-471","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"\nR \u4e2d\u7684\u89e3\u91ca\u9519\u8bef\uff1a\u201cmax\u201d\u5bf9\u4e8e\u56e0\u5b50\u800c\u8a00\u5e76\u4e0d\u91cd\u8981 - Statorials<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u89e3\u91ca\u5982\u4f55\u89e3\u91ca R \u4e2d\u7684\u4ee5\u4e0b\u9519\u8bef\uff1a\u201cmax\u201d\u5bf9\u4e8e\u56e0\u5b50\u6ca1\u6709\u610f\u4e49\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/cn\/r-max-\u5bf9\u56e0\u5b50\u4e0d\u663e\u7740\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R \u4e2d\u7684\u89e3\u91ca\u9519\u8bef\uff1a\u201cmax\u201d\u5bf9\u4e8e\u56e0\u5b50\u800c\u8a00\u5e76\u4e0d\u91cd\u8981 - 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