{"rsdb":{"rid":"377798","subhead":"","postdate":"0","aid":"264310","fid":"91","uid":"1","topic":"1","content":"<div id=\"cnblogs_post_body\" class=\"blogpost-body blogpost-body-html\"> \n <p>\u8f6c\u8f7d\u81ea\uff1a<a target=\"_blank\" rel=\"noopener\">R\u8bed\u8a00\u6559\u7a0b<\/a><\/p> \n <p>\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u4fa7\u91cd\u4e8e\u6570\u636e\u548c\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u7a0b\u5e8f\u3002\u9762\u5411\u5bf9\u8c61\u7684\u6a21\u578b\u6709\u52a9\u4e8e\u6211\u4eec\u5bf9\u73b0\u5b9e\u751f\u6d3b\u4e2d\u7684\u5bf9\u8c61\u8fdb\u884c\u5efa\u6a21\u3002\u4e3a\u4e86\u5728\u6570\u636e\u79d1\u5b66\u9886\u57df\u51fa\u7c7b\u62d4\u8403\uff0c\u638c\u63e1\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u6982\u5ff5\u5f88\u91cd\u8981\u3002\u6bcf\u4e2a\u7a0b\u5e8f\u90fd\u6709\u7279\u6b8a\u7c7b\u578b\u7684\u7c7b\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u5c06\u91cd\u70b9\u8ba8\u8bbaR\u8bed\u8a00\u4e2d\u7684S3\u548cS4\u7c7b\u3001\u6cdb\u578b\u51fd\u6570\u3001\u7c7b\u4e4b\u95f4\u7684\u7ee7\u627f\u6027\u548c\u591a\u6001\u6027\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bbaR\u4e2d\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u6982\u5ff5<\/p> \n <h2 id=\"ftoc-heading-2\" class=\"ftwp-heading\">R\u4e2d\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b<\/h2> \n <p>\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u662f\u4e00\u79cd\u56f4\u7ed5\u7740\u7c7b\u548c\u5bf9\u8c61\u800c\u4e0d\u662f\u51fd\u6570\u7684\u7f16\u7a0b\u6a21\u5f0f\u3002\u5728R\u4e2d\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u521b\u5efa\u4e24\u79cd\u7279\u6b8a\u7c7b\u578b\u7684\u7c7b\uff0c\u5373S3\u548cS4\u3002OOPS\u7684\u6982\u5ff5\u4f7f\u6211\u4eec\u80fd\u591f\u521b\u5efa\u6a21\u5757\u5316\u7684\u4f5c\u54c1\uff0c\u4f5c\u4e3a\u5927\u578b\u7cfb\u7edf\u7684\u6784\u5efa\u5757\u3002S3\u548cS4\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u4e24\u4e2a\u91cd\u8981\u7c7b\u3002S3\u7c7b\u5141\u8bb8\u91cd\u8f7d\u4efb\u4f55\u51fd\u6570\u3002S4\u7c7b\u4e0eS3\u7565\u6709\u4e0d\u540c\uff0c\u5b83\u5305\u542b\u7528\u4e8e\u5b9a\u4e49\u65b9\u6cd5\u548c\u6cdb\u578b\u7684\u8f85\u52a9\u51fd\u6570\u3002<\/p> \n <h3 id=\"ftoc-heading-3\" class=\"ftwp-heading\">R\u4e2d\u7684\u7c7b\u548c\u5bf9\u8c61<\/h3> \n <p>\u7c7b\u662f\u4e00\u79cd\u7528\u6237\u5b9a\u4e49\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5bf9\u8c61\u5c31\u662f\u4ece\u8fd9\u79cd\u7c7b\u578b\u4e2d\u521b\u5efa\u7684\u3002\u5b83\u4eec\u6709\u65f6\u4e5f\u88ab\u79f0\u4e3a\u84dd\u56fe\u3002\u8fd9\u662f\u56e0\u4e3a\u5b83\u4eec\u5b9a\u4e49\u4e86\u5bf9\u8c61\u7684\u7ed3\u6784\u3002\u4e00\u4e2a\u7c7b\u662f\u4e00\u4e2a\u88ab\u52a8\u7684\u5b9e\u4f53\uff0c\u800c\u4e00\u4e2a\u5bf9\u8c61\u662f\u4e00\u4e2a\u4e3b\u52a8\u7684\u5b9e\u4f53\u3002<\/p> \n <p>R\u8ba4\u4e3a\u6240\u6709\u4e8b\u7269\u90fd\u662f\u5bf9\u8c61\u3002\u4e00\u4e2a\u5bf9\u8c61\u662f\u4e00\u4e2a\u7c7b\u7684\u5355\u4e00\u5b9e\u4f8b\u3002R\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2aclass()\u51fd\u6570\uff0c\u5b83\u65e2\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u7684\u7c7b\uff0c\u4e5f\u53ef\u4ee5\u4e3a\u4e00\u4e2a\u5df2\u7ecf\u5b9a\u4e49\u7684\u5bf9\u8c61\u83b7\u53d6\u7c7b\u7684\u4fe1\u606f\u3002<\/p> \n <p>R\u4e2d\u7684\u7c7b\u662f\u4ee5\u77e2\u91cf\u5f62\u5f0f\u5b58\u5728\u7684\u3002\u7531\u4e8e\u8fd9\u4e2a\u5c5e\u6027\uff0c\u5bf9\u8c61\u53ef\u4ee5\u7ee7\u627f\u8bb8\u591a\u7c7b\uff0c\u800c\u4e14\u6211\u4eec\u8fd8\u53ef\u4ee5\u6307\u5b9a\u7ee7\u627f\u7684\u987a\u5e8f\uff0c\u5373\u4f7f\u662f\u590d\u6742\u7684\u7c7b\u3002<\/p> \n <h3 id=\"ftoc-heading-4\" class=\"ftwp-heading\">\u793a\u4f8b<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"typ\">Names<span class=\"pln\"> <span class=\"pun\">&lt;-<span class=\"pln\">c<span class=\"pun\">(<span class=\"str\">&quot;Bhuwanesh&quot;<span class=\"pun\">,<span class=\"str\">&quot;Jai&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Piyush&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Anil&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Hitesh&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Naveen&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"kwd\">print<span class=\"pun\">(<span class=\"kwd\">class<span class=\"pun\">(<span class=\"typ\">Names<span class=\"pun\">))<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <h3 id=\"ftoc-heading-5\" class=\"ftwp-heading\">\u8f93\u51fa<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;character&quot;<\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <p>\u7531\u4e8e\u8be5\u7c7b\u5143\u7d20\u5c5e\u4e8e\u5b57\u7b26\u7c7b\uff0c\u56e0\u6b64\u663e\u793a\u4e86 \u201c\u5b57\u7b26\u201d\u3002<\/p> \n <h3 id=\"ftoc-heading-6\" class=\"ftwp-heading\">\u793a\u4f8b<\/h3> \n <p>\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u8ffd\u52a0\u4e00\u4e2a\u5bf9\u8c61\u7684\u7c7b\u522b\u2013<\/p> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"typ\">Names<span class=\"pln\"> <span class=\"pun\">&lt;-<span class=\"pln\">c<span class=\"pun\">(<span class=\"str\">&quot;Bhuwanesh&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Jai&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Piyush&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Anil&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Hitesh&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"str\">&quot;Naveen&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"kwd\">class<span class=\"pun\">(<span class=\"typ\">Names<span class=\"pun\">)&lt;-<span class=\"pln\">append<span class=\"pun\">(<span class=\"kwd\">class<span class=\"pun\">(<span class=\"typ\">Names<span class=\"pun\">),<span class=\"pln\"> <span class=\"str\">&quot;boys&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"kwd\">print<span class=\"pun\">(<span class=\"kwd\">class<span class=\"pun\">(<span class=\"typ\">Names<span class=\"pun\">))<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <h3 id=\"ftoc-heading-7\" class=\"ftwp-heading\">\u8f93\u51fa<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;character&quot;<span class=\"pln\"> <span class=\"str\">&quot;boys&quot;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <p>\u6b63\u5982\u4f60\u5728\u8f93\u51fa\u4e2d\u770b\u5230\u7684\uff0c\u6211\u4eec\u5df2\u7ecf\u9644\u52a0\u4e86\u5411\u91cf\u7684\u7c7b\u522b\u3002<\/p> \n <h2 id=\"ftoc-heading-8\" class=\"ftwp-heading\">R\u4e2d\u7684\u7c7b<\/h2> \n <h3 id=\"ftoc-heading-9\" class=\"ftwp-heading\">S3 Class<\/h3> \n <p>S3\u7c7b\u662fR\u4e2d\u6700\u5e38\u7528\u7684\u7c7b\u4e4b\u4e00\u3002\u8fd9\u4e2a\u7c7b\u5f88\u5bb9\u6613\u5b9e\u73b0\uff0c\u8bb8\u591a\u9884\u5b9a\u4e49\u7684\u7c7b\u90fd\u662f\u8fd9\u79cd\u7c7b\u578b\u3002<\/p> \n <p>\u4e00\u4e2aS3\u7c7b\u7684\u5bf9\u8c61\u662f\u4e00\u4e2a\u5217\u8868\uff0c\u8be5\u5217\u8868\u5177\u6709\u7528\u4e00\u4e9b\u540d\u79f0\u5206\u914d\u7684\u7c7b\u5c5e\u6027\u3002\u5217\u8868\u7684\u7ec4\u6210\u90e8\u5206\u7531\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u8868\u793a\u3002<\/p> \n <h3 id=\"ftoc-heading-10\" class=\"ftwp-heading\">\u521b\u5efaS3\u7c7b<\/h3> \n <p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u521b\u5efa\u4e00\u4e2aS3\u5bf9\u8c61\u2014-\u3002<\/p> \n <ul> \n  <li>\u7f16\u5236\u4e00\u4efd\u5177\u6709\u6240\u9700\u7ec4\u4ef6\u4ef7\u503c\u7684\u6e05\u5355\u3002<\/li> \n  <li> <p>\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528class()\u51fd\u6570\u8f7b\u677e\u5730\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u540c\u65f6\u7ed9\u8fd9\u4e2a\u7c7b\u9644\u52a0\u4e00\u4e2a\u540d\u5b57\u3002<\/p> <\/li> \n <\/ul> \n <h3 id=\"ftoc-heading-11\" class=\"ftwp-heading\">\u793a\u4f8b<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"com\"># Creating list<span class=\"pln\"> myList <span class=\"pun\">&lt;-<span class=\"pln\"> list<span class=\"pun\">(<span class=\"typ\">Name<span class=\"pln\"> <span class=\"pun\">=<span class=\"str\">&quot;Bhuwanesh&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Enrollment_Number<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"lit\">3496303119<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Course<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Btech&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Branch<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Information Technology&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"com\"># class<span class=\"pln\"> <span class=\"kwd\">class<span class=\"pun\">(<span class=\"pln\">myList<span class=\"pun\">)<span class=\"pln\"> <span class=\"pun\">&lt;-<span class=\"pln\"> <span class=\"str\">&quot;University&quot;<span class=\"pln\"> myList<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <h3 id=\"ftoc-heading-12\" class=\"ftwp-heading\">\u8f93\u51fa<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"pln\">$Name <span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;Bhuwanesh&quot;<span class=\"pln\"> $Enrollment_Number <span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"lit\">3496303119<span class=\"pln\"> $Course <span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;Btech&quot;<span class=\"pln\"> $Branch <span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;Information Technology&quot;<span class=\"pln\"> attr<span class=\"pun\">(,<span class=\"str\">&quot;class&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;University&quot;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <h3 id=\"ftoc-heading-13\" class=\"ftwp-heading\">\u901a\u7528\u529f\u80fd<\/h3> \n <p>\u6211\u4eec\u5728R\u4e2d\u62e5\u6709\u901a\u7528\u51fd\u6570\uff0c\u53ef\u4ee5\u8fbe\u5230\u591a\u6001\u6027\u7684\u76ee\u7684\uff08\u5c31\u50cf\u8bb8\u591a\u5176\u4ed6\u54ce\u5440\u8bed\u8a00\uff1a<a href=https:\/\/www.cppentry.com\/list.php?fid=49 style=text-decoration:underline;font-size:14px;color:#F70968; target=_blank>C++<\/a>\uff0cJava\u7b49\uff09\u3002<\/p> \n <p>\u591a\u6001\u6027&nbsp;\u662f\u6307\u5f62\u5f0f\u3002\u5b83\u6307\u51fa\uff0c\u4e00\u6761\u4fe1\u606f\u53ef\u4ee5\u6709\u4e00\u4e2a\u4ee5\u4e0a\u7684\u4e0d\u540c\u5f62\u5f0f\uff0c\u6216\u8005\u5b83\u53ef\u4ee5\u4e3a\u4e0d\u540c\u7684\u76ee\u7684\u670d\u52a1\u3002<\/p> \n <p>\u4f8b\u5982\uff0c\u5728R\u8bed\u8a00\u4e2d\uff0csummary()\u51fd\u6570\u662f\u4e00\u4e2a\u7531\u8bb8\u591asummary()\u51fd\u6570\u7ec4\u6210\u7684\u96c6\u5408\uff0c\u53ef\u4ee5\u7528\u4e8e\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u548c\u6570\u636e\u7ed3\u6784\u3002\u8fd9\u7c7b\u51fd\u6570\u6839\u636e\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7684\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u8c03\u7528\u4e00\u4e2a\u9002\u5f53\u7684\u51fd\u6570\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528methods()\u51fd\u6570\u770b\u5230summary()\u51fd\u6570\u7684\u5404\u79cd\u5b9e\u73b0\u3002<\/p> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"pln\">methods<span class=\"pun\">(<span class=\"pln\">summary<span class=\"pun\">)<\/span><\/span><\/span><\/span><\/code><\/pre> \n <p>\u6211\u4eec\u53ef\u4ee5\u5728R\u4e2d\u521b\u5efa\u6211\u4eec\u81ea\u5df1\u7684\u901a\u7528\u51fd\u6570\u3002\u8ba9\u6211\u4eec\u8003\u8651\u4ee5\u4e0b\u7a0b\u5e8f\uff0c\u5b83\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3a \u201cmyList \u201c\u7684\u5217\u8868\uff0c\u7136\u540e\u4ece\u4e2d\u521b\u5efa\u4e00\u4e2a\u7c7b\u3002<\/p> \n <h3 id=\"ftoc-heading-14\" class=\"ftwp-heading\">\u793a\u4f8b<\/h3> \n <p>\u73b0\u5728\u6211\u4eec\u4f7f\u7528summary()\u51fd\u6570\u6765\u663e\u793a\u8fd9\u4e2a\u7c7b\u7684\u6458\u8981 \u2013<\/p> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"com\"># Create a list<span class=\"pln\"> myList <span class=\"pun\">&lt;-<span class=\"pln\"> list<span class=\"pun\">(<span class=\"typ\">Name<span class=\"pln\"> <span class=\"pun\">=<span class=\"str\">&quot;Bhuwanesh&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Enrollment_Number<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"lit\">3496303119<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Course<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Btech&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Branch<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Information Technology&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"com\"># Define the class<span class=\"pln\"> <span class=\"kwd\">class<span class=\"pun\">(<span class=\"pln\">myList<span class=\"pun\">)<span class=\"pln\"> <span class=\"pun\">&lt;-<span class=\"pln\"> <span class=\"str\">&quot;University&quot;<span class=\"pln\"> <span class=\"com\"># Display the summary<span class=\"pln\"> <span class=\"kwd\">print<span class=\"pun\">(<span class=\"pln\">summary<span class=\"pun\">(<span class=\"pln\">myList<span class=\"pun\">))<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <h3 id=\"ftoc-heading-15\" class=\"ftwp-heading\">\u8f93\u51fa<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"pln\"> <span class=\"typ\">Length<span class=\"pln\"> <span class=\"typ\">Class<span class=\"pln\"> <span class=\"typ\">Mode<span class=\"pln\"> <span class=\"typ\">Name<span class=\"pln\"> <span class=\"lit\">1<span class=\"pln\"> <span class=\"pun\">-<span class=\"pln\">none<span class=\"pun\">-<span class=\"pln\"> character <span class=\"typ\">Enrollment_Number<span class=\"pln\"> <span class=\"lit\">1<span class=\"pln\"> <span class=\"pun\">-<span class=\"pln\">none<span class=\"pun\">-<span class=\"pln\"> numeric <span class=\"typ\">Course<span class=\"pln\"> <span class=\"lit\">1<span class=\"pln\"> <span class=\"pun\">-<span class=\"pln\">none<span class=\"pun\">-<span class=\"pln\"> character <span class=\"typ\">Branch<span class=\"pln\"> <span class=\"lit\">1<span class=\"pln\"> <span class=\"pun\">-<span class=\"pln\">none<span class=\"pun\">-<span class=\"pln\"> character<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <h3 id=\"ftoc-heading-16\" class=\"ftwp-heading\">\u5c5e\u6027<\/h3> \n <p>\u5c5e\u6027\u662f\u4e0e\u4e00\u4e2a\u5bf9\u8c61\u76f8\u5173\u7684\u989d\u5916\u4fe1\u606f\uff0c\u7528\u4e8e\u5904\u7406\u8be5\u5bf9\u8c61\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 attributes() \u51fd\u6570\u6765\u83b7\u53d6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p> \n <h3 id=\"ftoc-heading-17\" class=\"ftwp-heading\">\u793a\u4f8b<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"com\"># Create a list<span class=\"pln\"> myList <span class=\"pun\">&lt;-<span class=\"pln\"> list<span class=\"pun\">(<span class=\"typ\">Name<span class=\"pln\"> <span class=\"pun\">=<span class=\"str\">&quot;Bhuwanesh&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Enrollment_Number<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"lit\">3496303119<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Course<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Btech&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Branch<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Information Technology&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"com\"># Define a class<span class=\"pln\"> <span class=\"kwd\">class<span class=\"pun\">(<span class=\"pln\">myList<span class=\"pun\">)<span class=\"pln\"> <span class=\"pun\">&lt;-<span class=\"pln\"> <span class=\"str\">&quot;University&quot;<span class=\"pln\"> <span class=\"com\"># Display attributes<span class=\"pln\"> <span class=\"kwd\">print<span class=\"pun\">(<span class=\"pln\">attributes<span class=\"pun\">(<span class=\"pln\">myList<span class=\"pun\">))<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <h3 id=\"ftoc-heading-18\" class=\"ftwp-heading\">\u8f93\u51fa<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"pln\">$names <span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;Name&quot;<span class=\"pln\"> <span class=\"str\">&quot;Enrollment_Number&quot;<span class=\"pln\"> <span class=\"str\">&quot;Course&quot;<span class=\"pln\"> <span class=\"pun\">[<span class=\"lit\">4<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;Branch&quot;<span class=\"pln\"> $class <span class=\"pun\">[<span class=\"lit\">1<span class=\"pun\">]<span class=\"pln\"> <span class=\"str\">&quot;University&quot;<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/code><\/pre> \n <p>\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728attr()\u51fd\u6570\u7684\u5e2e\u52a9\u4e0b\u5c06\u6211\u4eec\u81ea\u5df1\u7684\u5c5e\u6027\u5e94\u7528\u5230\u4e00\u4e2a\u5bf9\u8c61\u4e0a\uff0c\u8ba9\u6211\u4eec\u8003\u8651\u4e0b\u9762\u7684\u4f8b\u5b50\u6765\u8bf4\u660e\u8fd9\u4e2a\u51fd\u6570\u7684\u5de5\u4f5c\u539f\u7406<\/p> \n <h3 id=\"ftoc-heading-19\" class=\"ftwp-heading\">\u793a\u4f8b<\/h3> \n <pre class=\"prettyprint\"><code class=\"language-R  line-numbers\"><span class=\"com\"># Create a list<span class=\"pln\"> myList <span class=\"pun\">&lt;-<span class=\"pln\"> list<span class=\"pun\">(<span class=\"typ\">Name<span class=\"pln\"> <span class=\"pun\">=<span class=\"str\">&quot;Bhuwanesh&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Enrollment_Number<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"lit\">3496303119<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Course<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Btech&quot;<span class=\"pun\">,<span class=\"pln\"> <span class=\"typ\">Branch<span class=\"pln\"> <span class=\"pun\">=<span class=\"pln\"> <span class=\"str\">&quot;Information&nbsp;Technology&quot;<span class=\"pun\">)<span class=\"pln\"> <span class=\"com\"># Define class<span class=\"pln\"> <span class=\"kwd\">class<span class=\"pun\">(<span class=\"pln\">myList<span class=\"pun\">)<span class=\"pln\"> <span class=\"pun\">&lt;-<span class=\"str\">&quot;U","orderid":"0","title":"\u3010\u8f6c\u8f7d\u3011R\u8bed\u8a00 \u9762\u5411\u5bf9\u8c61\u7f16\u7a0b(\u4e00)","smalltitle":"","mid":"0","fname":"R\u8bed\u8a00","special_id":"0","bak_id":"0","info":"0","hits":"429","pages":"3","comments":"0","posttime":"2023-07-23 13:24:53","list":"1690089893","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"<A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%D7%AA%D4%D8' target=_blank>\u8f6c\u8f7d<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%D3%EF%D1%D4' target=_blank>\u8bed\u8a00<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%CF%F2%B6%D4%CF%F3' target=_blank>\u5411\u5bf9\u8c61<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"119.59.235.169","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"\u3010\u8f6c\u8f7d\u3011R\u8bed\u8a00 \u9762\u5411\u5bf9\u8c61\u7f16\u7a0b","lastview":"1716080895","digg_num":"0","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}