{"id":2363,"date":"2022-05-23T17:55:15","date_gmt":"2022-05-23T09:55:15","guid":{"rendered":"http:\/\/cnliutz.uicp.io\/?p=2363"},"modified":"2022-05-23T17:55:15","modified_gmt":"2022-05-23T09:55:15","slug":"r%e8%af%ad%e8%a8%80list%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"http:\/\/qbtobjow.ipyingshe.net:5347\/?p=2363","title":{"rendered":"R\u8bed\u8a00list()\u5e94\u7528"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>## list()\u5217\u8868\n```{r}\nfindwords &lt;- function(tf){     #tf short for:text file\n  txt &lt;- scan(tf,\"\")           #\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\uff0c\u7a7a\u683c\u95f4\u9694\u7684\u82f1\u6587\u5185\u5bb9\uff0c\u6c49\u5b57\u4e0d\u9002\u7528\n  print(txt)                   #\u8f93\u51fa\u6587\u672c\u5217\u8868\n  wl &lt;- list()                 #\u521b\u5efaword\uff08\u5355\u8bcd\uff09\u5217\u8868list --wl\n  for (i in 1:length(txt)){    # \u5faa\u73af\u8bfb\u53d6txt\u5185\u5355\u8bcd\n    wrd &lt;- txt&#91;i]\n    wl&#91;&#91;wrd]] &lt;- c(wl&#91;&#91;wrd]],i)  # wl&#91;&#91;wrd]\u662f\u4e2a\u5355\u8bcd\u4f4d\u7f6e\uff0c\u628a\u4f4d\u7f6e\u5411\u91cf\u5b58\u8d77\u6765\n  }\n  return(wl)\n}\n#orders the output of findwords() by word frequwncy\nfreqwl &lt;- function(wordlist){\n  freqs &lt;- sapply(wordlist,length)\n  return(wordlist&#91;order(freqs)])   #order()\u6309\u4f4d\u6b21\u6392\u5e8f\uff0csort() \u6309\u503c\u6392\u5e8f\n}\n\nx &lt;- findwords(\"tf.txt\") \n# names(x)     #\u663e\u793a\u5217\u8868\u6807\u7b7e\u540d\uff0c\u63d0\u53d6x\u4e2d\u7684\u5355\u8bcd\n# unlisted(x)  #\u83b7\u53d6\u5217\u8868\u7684\u503c\n# unname(x)    #\u53bb\u6389\u5217\u8868\u5143\u7d20\u540d\n#sort(names(x)) #\u5217\u8868\u6807\u7b7e\u540d\uff08\u5355\u8bcd)\u6392\u5e8f\n#\u63d0\u53d6\u8bcd\u9891\u8f83\u9ad8\u768410%\u5355\u8bcd\u4f5c\u56fe\n#----------------------------\nsnyt &lt;- freqwl(x)\nnword &lt;- length(snyt)\nfreqs &lt;- sapply(snyt&#91;round(0.9*nword):nword],length)\nbarplot(freqs)\n\n```\n\n## \u5217\u8868\u5e94\u7528lapply\uff08\uff09 &amp; sapply\uff08\uff09\n```{r}\nlapply(list(1:6,20:36),median) #\u8f93\u51fa\u4e2d\u4f4d\u65701:6\uff0c20:36\u5217\u8868\nsapply(list(1:6,20:36),median) #\u8f93\u51fa\u4e2d\u4f4d\u65701:6\uff0c20:36\u77e9\u9635<\/code><\/pre>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-7c5e5e51-1c9c-401c-9945-22cdcce02157\" href=\"http:\/\/cnliutz.uicp.io\/wp-content\/uploads\/2022\/05\/tf.txt\">tf.txt<\/a><a href=\"http:\/\/cnliutz.uicp.io\/wp-content\/uploads\/2022\/05\/tf.txt\" class=\"wp-block-file__button\" download aria-describedby=\"wp-block-file--media-7c5e5e51-1c9c-401c-9945-22cdcce02157\">\u4e0b\u8f7d<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-2363","post","type-post","status-publish","format-standard","hentry","category-r"],"_links":{"self":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/2363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2363"}],"version-history":[{"count":0,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=\/wp\/v2\/posts\/2363\/revisions"}],"wp:attachment":[{"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2363"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/qbtobjow.ipyingshe.net:5347\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}