{"id":84,"date":"2018-11-15T09:05:00","date_gmt":"2018-11-15T09:05:00","guid":{"rendered":"https:\/\/www.wangliguang.cn\/?p=84"},"modified":"2018-11-15T09:05:00","modified_gmt":"2018-11-15T09:05:00","slug":"r%e4%b8%adunique%e7%9a%84%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/wangliguang.cn\/?p=84","title":{"rendered":"R\u4e2dunique\u7684\u7528\u6cd5"},"content":{"rendered":"<p>\u5b98\u65b9\u89e3\u91ca\uff1aunique\u00a0returns a vector, data frame or array like\u00a0x but with duplicate elements\/rows removed.<br \/>\nduplicate\uff1a\u5b8c\u5168\u4e00\u6837\u7684<br \/>\nunique\u4e3b\u8981\u662f\u8fd4\u56de\u4e00\u4e2a\u628a\u91cd\u590d\u5143\u7d20\u6216\u884c\u7ed9\u5220\u9664\u7684\u5411\u91cf\u3001\u6570\u636e\u6846\u6216\u6570\u7ec4<br \/>\n\u4e3e\u4f8b\uff1a<\/p>\n<blockquote><p>\nx <- c(3:5, 11:8, 8 + 0:5)<br \/>\nx<br \/>\n\u00a0[1] \u00a03 \u00a04 \u00a05 11 10 \u00a09 \u00a08 \u00a08 \u00a09 10 11 12 13<br \/>\nunique(x)<br \/>\n[1] \u00a03 \u00a04 \u00a05 11 10 \u00a09 \u00a08 12 13<br \/>\nunique(x, fromLast = TRUE)<br \/>\n[1] \u00a03 \u00a04 \u00a05 \u00a08 \u00a09 10 11 12 13 \u00a0 \u00a0#\u6392\u5e8f\u540e\u7684\n<\/p><\/blockquote>\n<blockquote><p>\na<br \/>\n\u00a0 \u00a0 \u00a0[,1] [,2] [,3]<br \/>\n[1,] \u00a0 \u00a01 \u00a0 \u00a02 \u00a0 \u00a03<br \/>\n[2,] \u00a0 \u00a01 \u00a0 \u00a02 \u00a0 \u00a04<br \/>\n[3,] \u00a0 \u00a01 \u00a0 \u00a03 \u00a0 \u00a05<br \/>\n[4,] \u00a0 \u00a01 \u00a0 \u00a02 \u00a0 \u00a03\n<\/p><\/blockquote>\n<blockquote><p>\nunique(a)<br \/>\n\u00a0 \u00a0 \u00a0[,1] [,2] [,3]<br \/>\n[1,] \u00a0 \u00a01 \u00a0 \u00a02 \u00a0 \u00a03<br \/>\n[2,] \u00a0 \u00a01 \u00a0 \u00a02 \u00a0 \u00a04<br \/>\n[3,] \u00a0 \u00a01 \u00a0 \u00a03 \u00a0 \u00a05 \u00a0 #\u53bb\u9664\u91cd\u590d\u7684\u6700\u540e\u4e00\u884c\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\u5b98\u65b9\u89e3\u91ca\uff1aunique\u00a0returns a vector, data frame or array like\u00a0&hellip; <a href=\"https:\/\/wangliguang.cn\/?p=84\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">R\u4e2dunique\u7684\u7528\u6cd5<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[34],"class_list":["post-84","post","type-post","status-publish","format-standard","hentry","category-r","tag-r"],"_links":{"self":[{"href":"https:\/\/wangliguang.cn\/index.php?rest_route=\/wp\/v2\/posts\/84","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wangliguang.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wangliguang.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wangliguang.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wangliguang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=84"}],"version-history":[{"count":0,"href":"https:\/\/wangliguang.cn\/index.php?rest_route=\/wp\/v2\/posts\/84\/revisions"}],"wp:attachment":[{"href":"https:\/\/wangliguang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=84"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wangliguang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=84"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wangliguang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=84"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}