{"id":394,"date":"2023-03-19T22:45:01","date_gmt":"2023-03-19T22:45:01","guid":{"rendered":"https:\/\/yunshangtulv.com.cn\/?p=394"},"modified":"2023-03-19T22:45:01","modified_gmt":"2023-03-19T22:45:01","slug":"%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%af%a6%e8%a7%a3%e5%8f%8a%e5%ba%94%e7%94%a8%e5%ae%9e%e4%be%8b","status":"publish","type":"post","link":"https:\/\/yunshangtulv.com.cn\/?p=394","title":{"rendered":"\u5b57\u7b26\u4e32\u8be6\u89e3\u53ca\u5e94\u7528\u5b9e\u4f8b"},"content":{"rendered":"

\u5728R\u8bed\u8a00\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u4e00\u79cd\u975e\u5e38\u91cd\u8981\u7684\u6570\u636e\u7c7b\u578b\u3002\u5b57\u7b26\u4e32\u53ef\u4ee5\u7528\u6765\u8868\u793a\u6587\u672c\u3001\u6807\u7b7e\u3001\u6587\u4ef6\u540d\u7b49\uff0c\u5176\u5904\u7406\u548c\u64cd\u4f5c\u4e5f\u975e\u5e38\u7075\u6d3b\u3002\u4e0b\u9762\u662fR\u8bed\u8a00\u5b57\u7b26\u4e32\u7684\u6559\u7a0b\u53ca\u5e94\u7528\u5b9e\u4f8b\u3002<\/p>\n

    \n
  1. \u5b57\u7b26\u4e32\u7684\u521b\u5efa<\/li>\n<\/ol>\n

    1.1. \u76f4\u63a5\u8f93\u5165<\/p>\n

    \u53ef\u4ee5\u4f7f\u7528\u5355\u5f15\u53f7\u6216\u53cc\u5f15\u53f7\u6765\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n

    \n
    str1 <-<\/span> 'Hello World'<\/span>
    \nstr2 <-<\/span> \"Hello World\"<\/span>
    \n<\/code><\/div>\n<\/div>\n

    1.2. \u4f7f\u7528paste()\u51fd\u6570<\/p>\n

    \u53ef\u4ee5\u4f7f\u7528paste()\u51fd\u6570\u5c06\u591a\u4e2a\u5b57\u7b26\u4e32\u62fc\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n

    \n
    str3 <-<\/span> paste(<\/span>\"Hello\"<\/span>,<\/span> \"World\"<\/span>,<\/span> \"!\"<\/span>)<\/span>
    \n<\/code><\/div>\n<\/div>\n

    1.3. \u4f7f\u7528sprintf()\u51fd\u6570<\/p>\n

    \u53ef\u4ee5\u4f7f\u7528sprintf()\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u4e0e\u5176\u4ed6\u7c7b\u578b\u7684\u6570\u636e\u683c\u5f0f\u5316\u8f93\u51fa\u3002<\/p>\n

    \n
    num1 <-<\/span> 10
    \nstr4 <-<\/span> sprintf(<\/span>\"The value of num1 is %d.\"<\/span>,<\/span> num1)<\/span>
    \n<\/code><\/div>\n<\/div>\n
      \n
    1. \u5b57\u7b26\u4e32\u7684\u7d22\u5f15\u548c\u5207\u7247<\/li>\n<\/ol>\n

      2.1. \u7d22\u5f15<\/p>\n

      \u53ef\u4ee5\u4f7f\u7528[]\u8fd0\u7b97\u7b26\u6765\u8bbf\u95ee\u5b57\u7b26\u4e32\u4e2d\u7684\u5355\u4e2a\u5b57\u7b26\u3002<\/p>\n

      \n
      str5 <-<\/span> \"Hello World\"<\/span>
      \nstr5[<\/span>1<\/span>]<\/span> # \u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\uff0c\u5373\"H\"<\/span>
      \n<\/code><\/div>\n<\/div>\n

      2.2. \u5207\u7247<\/p>\n

      \u53ef\u4ee5\u4f7f\u7528[]\u8fd0\u7b97\u7b26\u52a0\u4e0a\u5192\u53f7\u6765\u8bbf\u95ee\u5b57\u7b26\u4e32\u4e2d\u7684\u5b50\u4e32\u3002<\/p>\n

      \n
      str6 <-<\/span> \"Hello World\"<\/span>
      \nstr6[<\/span>1<\/span>:<\/span>5<\/span>]<\/span> # \u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u524d\u4e94\u4e2a\u5b57\u7b26\uff0c\u5373\"Hello\"<\/span>
      \n<\/code><\/div>\n<\/div>\n
        \n
      1. \u5b57\u7b26\u4e32\u7684\u64cd\u4f5c<\/li>\n<\/ol>\n

        3.1. \u5b57\u7b26\u4e32\u7684\u62fc\u63a5<\/p>\n

        \u53ef\u4ee5\u4f7f\u7528paste()\u51fd\u6570\u5c06\u591a\u4e2a\u5b57\u7b26\u4e32\u62fc\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n

        \n
        str7 <-<\/span> \"Hello\"<\/span>
        \nstr8 <-<\/span> \"World\"<\/span>
        \nstr9 <-<\/span> paste(<\/span>str7,<\/span> str8)<\/span>
        \n<\/code><\/div>\n<\/div>\n

        3.2. \u5b57\u7b26\u4e32\u7684\u66ff\u6362<\/p>\n

        \u53ef\u4ee5\u4f7f\u7528sub()\u51fd\u6570\u6216gsub()\u51fd\u6570\u6765\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5b50\u4e32\u3002<\/p>\n

        \n
        str10 <-<\/span> \"Hello World\"<\/span>
        \nstr11 <-<\/span> sub(<\/span>\"World\"<\/span>,<\/span> \"R\"<\/span>,<\/span> str10)<\/span>
        \nstr12 <-<\/span> gsub(<\/span>\"l\"<\/span>,<\/span> \"L\"<\/span>,<\/span> str10)<\/span>
        \n<\/code><\/div>\n<\/div>\n

        3.3. \u5b57\u7b26\u4e32\u7684\u5206\u5272<\/p>\n

        \u53ef\u4ee5\u4f7f\u7528strsplit()\u51fd\u6570\u6765\u5206\u5272\u5b57\u7b26\u4e32\u3002<\/p>\n

        \n
        str13 <-<\/span> \"Hello World\"<\/span>
        \nstr14 <-<\/span> strsplit(<\/span>str13,<\/span> \" \"<\/span>)<\/span>[[<\/span>1<\/span>]<\/span>]<\/span>
        \n<\/code><\/div>\n<\/div>\n
          \n
        1. \u5b57\u7b26\u4e32\u7684\u8f6c\u6362<\/li>\n<\/ol>\n

          4.1. \u5927\u5c0f\u5199\u8f6c\u6362<\/p>\n

          \u53ef\u4ee5\u4f7f\u7528toupper()\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\uff0c\u4f7f\u7528tolower()\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u5f62\u5f0f\u3002<\/p>\n

          \n
          str15 <-<\/span> \"Hello World\"<\/span>
          \nstr16 <-<\/span> toupper(<\/span>str15)<\/span>
          \nstr17 <-<\/span> tolower(<\/span>str15)<\/span>
          \n<\/code><\/div>\n<\/div>\n

          4.2. \u6570\u5b57\u8f6c\u6362<\/p>\n

          \u53ef\u4ee5\u4f7f\u7528as.numeric()\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u5b57\u5f62\u5f0f\u3002<\/p>\n

          \n
          str18 <-<\/span> \"10\"<\/span>
          \nnum2 <-<\/span> as.numeric<\/span>(<\/span>str18)<\/span>
          \n<\/code><\/div>\n<\/div>\n
            \n
          1. \u5b57\u7b26\u4e32\u7684\u5339\u914d\u548c\u67e5\u627e<\/li>\n<\/ol>\n

            5.1. \u5b57\u7b26\u4e32\u7684\u5339\u914d<\/p>\n

            \u53ef\u4ee5\u4f7f\u7528grep()\u51fd\u6570\u6765\u67e5\u627e\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5b50\u4e32\u3002<\/p>\n

            \n
            str19 <-<\/span> \"Hello World\"<\/span>
            \nmatch1 <-<\/span> grep(<\/span>\"World\"<\/span>,<\/span> str19)<\/span>
            \n<\/code><\/div>\n<\/div>\n

            5.2. \u5b57\u7b26\u4e32\u7684\u67e5\u627e<\/p>\n

            \u53ef\u4ee5\u4f7f\u7528str_locate()\u51fd\u6570\u548cstr_extract()\u51fd\u6570\u6765\u67e5\u627e\u548c\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u5b50\u4e32\u3002<\/p>\n

            \n
            library(<\/span>stringr)<\/span><\/p>\n

            str20 <-<\/span> \"Hello World\"<\/span>
            \nmatch2 <-<\/span> str_locate(<\/span>str20,<\/span> \"World\"<\/span>)<\/span>
            \nsub_str1 <-<\/span> str_extract(<\/span>str20,<\/span> \"World\"<\/span>)<\/span>
            \n<\/code><\/div>\n<\/div>\n

              \n
            1. \u5b57\u7b26\u4e32\u7684\u6bd4\u8f83<\/li>\n<\/ol>\n

              \u53ef\u4ee5\u4f7f\u7528==\u8fd0\u7b97\u7b26\u6216strcmp()\u51fd\u6570\u6765\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002<\/p>\n

              \n
              str21 <-<\/span> \"Hello World\"<\/span>
              \nstr22 <-<\/span> \"Hello World\"<\/span>
              \ncomp1 <-<\/span> str21 ==<\/span> str22
              \ncomp2 <-<\/span> strcmp(<\/span>str21,<\/span> str22)<\/span>
              \n<\/code><\/div>\n<\/div>\n
                \n
              1. \u5b57\u7b26\u4e32\u7684\u957f\u5ea6<\/li>\n<\/ol>\n

                \u53ef\u4ee5\u4f7f\u7528nchar()\u51fd\u6570\u6765\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n

                \n
                str23 <-<\/span> \"Hello World\"<\/span>
                \nlen1 <-<\/span> nchar(<\/span>str23)<\/span>
                \n<\/code><\/div>\n<\/div>\n
                  \n
                1. \u5b57\u7b26\u4e32\u7684\u8f93\u51fa<\/li>\n<\/ol>\n

                  \u53ef\u4ee5\u4f7f\u7528cat()\u51fd\u6570\u6765\u8f93\u51fa\u5b57\u7b26\u4e32\u3002<\/p>\n

                  \n
                  str24 <-<\/span> \"Hello World\"<\/span>
                  \ncat(<\/span>str24,<\/span> \"\\n\"<\/span>)<\/span>
                  \n<\/code><\/div>\n<\/div>\n
                    \n
                  1. \u5e94\u7528\u5b9e\u4f8b<\/li>\n<\/ol>\n

                    \u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528\u5b57\u7b26\u4e32\u7684\u5b9e\u4f8b\uff0c\u8be5\u5b9e\u4f8b\u4ece\u4e00\u4e2a\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5e76\u5c06\u6570\u636e\u5b58\u50a8\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf\u4e2d\u3002<\/p>\n

                    \n
                    # \u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e<\/span>
                    \ndata <-<\/span> readLines(<\/span>\"data.txt\"<\/span>)<\/span><\/p>\n

                    # \u5c06\u6570\u636e\u5b58\u50a8\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf\u4e2d<\/span>
                    \ndata_str <-<\/span> paste(<\/span>data,<\/span> collapse =<\/span> \"\\n\"<\/span>)<\/span>
                    \n<\/code><\/div>\n<\/div>\n

                    \u4e0a\u8ff0\u5b9e\u4f8b\u4e2d\uff0creadLines()\u51fd\u6570\u7528\u4e8e\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\uff0cpaste()\u51fd\u6570\u7528\u4e8e\u5c06\u6570\u636e\u62fc\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u8be5\u5b9e\u4f8b\u4e2d\u4f7f\u7528\u4e86collapse\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u6307\u5b9a\u4e86\u5728\u62fc\u63a5\u5b57\u7b26\u4e32\u65f6\u4f7f\u7528\u7684\u5206\u9694\u7b26\u3002\u5728\u8be5\u5b9e\u4f8b\u4e2d\uff0c\u5206\u9694\u7b26\u4e3a\"\\n\"\uff0c\u5373\u6362\u884c\u7b26\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

                    \u5728R\u8bed\u8a00\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u4e00\u79cd\u975e\u5e38\u91cd\u8981\u7684\u6570\u636e\u7c7b\u578b\u3002\u5b57\u7b26\u4e32\u53ef\u4ee5\u7528\u6765\u8868\u793a\u6587\u672c\u3001\u6807\u7b7e\u3001\u6587\u4ef6\u540d\u7b49\uff0c\u5176\u5904\u7406\u548c\u64cd\u4f5c\u4e5f\u975e\u5e38\u7075\u6d3b\u3002\u4e0b […]<\/p>\n","protected":false},"author":111,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-394","post","type-post","status-publish","format-standard","hentry","category-r"],"_links":{"self":[{"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/394","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=\/wp\/v2\/users\/111"}],"replies":[{"embeddable":true,"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=394"}],"version-history":[{"count":0,"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/394\/revisions"}],"wp:attachment":[{"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=394"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=394"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunshangtulv.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=394"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}