{"id":1891,"date":"2023-07-24T14:03:20","date_gmt":"2023-07-24T14:03:20","guid":{"rendered":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/"},"modified":"2023-07-24T14:03:20","modified_gmt":"2023-07-24T14:03:20","slug":"r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/","title":{"rendered":"\u5982\u4f55\u5728 r \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09"},"content":{"rendered":"

<\/p>\n

\n

\u60a8\u53ef\u4ee5\u4f7f\u7528 R \u4e2d\u7684nrow()<\/strong>\u51fd\u6570\u6765\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u7684\u884c\u6570\uff1a<\/span><\/p>\n

 #count number of rows in data frame<\/span>\nnrow(df)<\/strong><\/pre>\n
\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728\u5b9e\u8df5\u4e2d\u4f7f\u7528\u4ee5\u4e0b\u6570\u636e\u6846\u4f7f\u7528\u6b64\u51fd\u6570\uff1a<\/span><\/p>\n
 #create data frame<\/span>\ndf <- data. frame<\/span> (x=c(1, 2, 3, 3, 5, NA),\n                 y=c(8, 14, NA, 25, 29, NA)) \n\n#view data frame\n<\/span>df\n\n   xy\n1 1 8\n2 2 14\n3 3 NA\n4 3 25\n5 5 29\n6 NA NA\n<\/strong><\/pre>\n
\u793a\u4f8b 1\uff1a\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u7684\u884c\u6570<\/strong><\/span><\/h3>\n
\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u7684\u603b\u884c\u6570\uff1a<\/span><\/p>\n
 #count total rows in data frame<\/span>\nnrow(df)\n\n[1] 6\n<\/strong><\/pre>\n
\u603b\u5171\u67096<\/strong>\u884c\u3002<\/span><\/p>\n
\u793a\u4f8b 2\uff1a\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u6709\u6761\u4ef6\u7684\u884c\u6570<\/strong><\/span><\/h3>\n
\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u8ba1\u7b97\u201cx\u201d\u5217\u4e2d\u7684\u503c\u5927\u4e8e 3 \u5e76\u4e14\u4e0d\u4e3a\u7a7a\u7684\u884c\u6570\uff1a<\/span><\/p>\n
 #count total rows in data frame where 'x' is greater than 3 and not blank<\/span>\nnrow(df[df$x>3 & !is. na<\/span> (df$x), ])\n\n[1] 1<\/strong><\/pre>\n
\u6570\u636e\u6846\u4e2d\u67091<\/strong>\u884c\u6ee1\u8db3\u6b64\u6761\u4ef6\u3002<\/span><\/p>\n
\u793a\u4f8b 3\uff1a\u8ba1\u7b97\u6ca1\u6709\u7f3a\u5931\u503c\u7684\u884c\u6570<\/strong><\/span><\/h3>\n
\u4e0b\u9762\u7684\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528complete.cases()<\/a>\u51fd\u6570\u6765\u7edf\u8ba1\u6570\u636e\u6846\u4e2d\u4e0d\u5b58\u5728\u7f3a\u5931\u503c\u7684\u884c\u6570\uff1a<\/span><\/p>\n
 #count total rows in data frame with no missing values in any column<\/span>\nnrow(df[complete. cases<\/span> (df), ])\n\n[1] 4<\/strong><\/pre>\n
\u6570\u636e\u6846\u4e2d\u67094<\/strong>\u884c\u6ca1\u6709\u7f3a\u5931\u503c\u3002<\/span><\/p>\n
\u793a\u4f8b4\uff1a\u8ba1\u7b97\u7279\u5b9a\u5217\u4e2d\u7f3a\u5931\u503c\u7684\u884c\u6570<\/strong><\/span><\/h3>\n
\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u4f7f\u7528is.na()<\/a>\u51fd\u6570\u4e13\u95e8\u8ba1\u7b97\u201cy\u201d\u5217\u4e2d\u7f3a\u5c11\u503c\u7684\u884c\u6570\uff1a<\/span><\/p>\n
 #count total rows in with missing value in 'y' column<\/span>\nnrow(df[is. na<\/span> (df$y), ])\n\n[1] 2<\/strong><\/pre>\n
 \u201cy\u201d\u5217\u4e2d\u67092<\/strong>\u884c\u7f3a\u5931\u503c\u3002<\/span><\/p>\n
\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n
\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 rowSums() \u51fd\u6570<\/a>
 \u5982\u4f55\u5c06\u51fd\u6570\u5e94\u7528\u4e8eR\u4e2d\u6570\u636e\u6846\u7684\u6bcf\u4e00\u884c<\/a>
\u5982\u4f55\u6839\u636e\u6761\u4ef6\u4eceR\u4e2d\u7684\u6570\u636e\u6846\u4e2d\u5220\u9664\u884c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u60a8\u53ef\u4ee5\u4f7f\u7528 R \u4e2d\u7684nrow()\u51fd\u6570\u6765\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u7684\u884c\u6570\uff1a #count number of rows in  […]<\/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-1891","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"\n\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09 \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow() \u51fd\u6570\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\u4e2d\u7684nrow\u51fd\u6570\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09 \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow() \u51fd\u6570\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/cn\/r\u4e2d\u7684nrow\u51fd\u6570\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-24T14:03:20+00:00\" \/>\n<meta name=\"author\" content=\"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/\",\"url\":\"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/\",\"name\":\"\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09 \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/cn\/#website\"},\"datePublished\":\"2023-07-24T14:03:20+00:00\",\"dateModified\":\"2023-07-24T14:03:20+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/cn\/#\/schema\/person\/124e4e5b7c9f8dc0f1f95cc8c1db3261\"},\"description\":\"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow() \u51fd\u6570\u3002\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u5bb6\",\"item\":\"https:\/\/statorials.org\/cn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u5982\u4f55\u5728 r \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/cn\/#website\",\"url\":\"https:\/\/statorials.org\/cn\/\",\"name\":\"Statorials\",\"description\":\"\u60a8\u7684\u7edf\u8ba1\u7d20\u517b\u6307\u5357\uff01\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/cn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/cn\/#\/schema\/person\/124e4e5b7c9f8dc0f1f95cc8c1db3261\",\"name\":\"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/statorials.org\/cn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/cn\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/cn\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a\"},\"description\":\"\u5927\u5bb6\u597d\uff0c\u6211\u662f\u672c\u6770\u660e\uff0c\u4e00\u4f4d\u9000\u4f11\u7684\u7edf\u8ba1\u5b66\u6559\u6388\uff0c\u540e\u6765\u6210\u4e3a Statorials \u7684\u70ed\u5fc3\u6559\u5e08\u3002 \u51ed\u501f\u5728\u7edf\u8ba1\u9886\u57df\u7684\u4e30\u5bcc\u7ecf\u9a8c\u548c\u4e13\u4e1a\u77e5\u8bc6\uff0c\u6211\u6e34\u671b\u5206\u4eab\u6211\u7684\u77e5\u8bc6\uff0c\u901a\u8fc7 Statorials \u589e\u5f3a\u5b66\u751f\u7684\u80fd\u529b\u3002\u4e86\u89e3\u66f4\u591a\",\"sameAs\":[\"https:\/\/statorials.org\/cn\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09 \u2013 Statorials","description":"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow() \u51fd\u6570\u3002","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/statorials.org\/cn\/r\u4e2d\u7684nrow\u51fd\u6570\/","og_locale":"zh_CN","og_type":"article","og_title":"\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09 \u2013 Statorials","og_description":"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow() \u51fd\u6570\u3002","og_url":"https:\/\/statorials.org\/cn\/r\u4e2d\u7684nrow\u51fd\u6570\/","og_site_name":"Statorials","article_published_time":"2023-07-24T14:03:20+00:00","author":"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"1 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/","url":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/","name":"\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09 \u2013 Statorials","isPartOf":{"@id":"https:\/\/statorials.org\/cn\/#website"},"datePublished":"2023-07-24T14:03:20+00:00","dateModified":"2023-07-24T14:03:20+00:00","author":{"@id":"https:\/\/statorials.org\/cn\/#\/schema\/person\/124e4e5b7c9f8dc0f1f95cc8c1db3261"},"description":"\u672c\u6559\u7a0b\u901a\u8fc7\u51e0\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528 nrow() \u51fd\u6570\u3002","breadcrumb":{"@id":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84nrow%e5%87%bd%e6%95%b0\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u5bb6","item":"https:\/\/statorials.org\/cn\/"},{"@type":"ListItem","position":2,"name":"\u5982\u4f55\u5728 r \u4e2d\u4f7f\u7528 nrow \u51fd\u6570\uff08\u9644\u793a\u4f8b\uff09"}]},{"@type":"WebSite","@id":"https:\/\/statorials.org\/cn\/#website","url":"https:\/\/statorials.org\/cn\/","name":"Statorials","description":"\u60a8\u7684\u7edf\u8ba1\u7d20\u517b\u6307\u5357\uff01","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/statorials.org\/cn\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/statorials.org\/cn\/#\/schema\/person\/124e4e5b7c9f8dc0f1f95cc8c1db3261","name":"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/statorials.org\/cn\/#\/schema\/person\/image\/","url":"https:\/\/statorials.org\/cn\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg","contentUrl":"https:\/\/statorials.org\/cn\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg","caption":"\u672c\u6770\u660e\u00b7\u5b89\u5fb7\u68ee\u535a"},"description":"\u5927\u5bb6\u597d\uff0c\u6211\u662f\u672c\u6770\u660e\uff0c\u4e00\u4f4d\u9000\u4f11\u7684\u7edf\u8ba1\u5b66\u6559\u6388\uff0c\u540e\u6765\u6210\u4e3a Statorials \u7684\u70ed\u5fc3\u6559\u5e08\u3002 \u51ed\u501f\u5728\u7edf\u8ba1\u9886\u57df\u7684\u4e30\u5bcc\u7ecf\u9a8c\u548c\u4e13\u4e1a\u77e5\u8bc6\uff0c\u6211\u6e34\u671b\u5206\u4eab\u6211\u7684\u77e5\u8bc6\uff0c\u901a\u8fc7 Statorials \u589e\u5f3a\u5b66\u751f\u7684\u80fd\u529b\u3002\u4e86\u89e3\u66f4\u591a","sameAs":["https:\/\/statorials.org\/cn"]}]}},"yoast_meta":{"yoast_wpseo_title":"","yoast_wpseo_metadesc":"","yoast_wpseo_canonical":""},"_links":{"self":[{"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/posts\/1891","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/comments?post=1891"}],"version-history":[{"count":0,"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/posts\/1891\/revisions"}],"wp:attachment":[{"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/media?parent=1891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/categories?post=1891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/statorials.org\/cn\/wp-json\/wp\/v2\/tags?post=1891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}