{"id":960,"date":"2019-02-28T22:03:48","date_gmt":"2019-02-28T13:03:48","guid":{"rendered":"http:\/\/141.164.34.82\/?p=960"},"modified":"2019-02-28T22:08:12","modified_gmt":"2019-02-28T13:08:12","slug":"r-%ec%a0%95%ea%b7%9c%ed%91%9c%ed%98%84%ec%8b%9d-%eb%82%a8%eb%93%a4%ec%9d%80-%ec%9e%98-%eb%aa%a8%eb%a5%b4%eb%8a%94-%ea%b8%b0%ec%b4%88","status":"publish","type":"post","link":"http:\/\/ds.sumeun.org\/?p=960","title":{"rendered":"R \uc815\uaddc\ud45c\ud604\uc2dd: \ub0a8\ub4e4\uc740 \uc798 \ubaa8\ub974\ub294 \uae30\ucd08"},"content":{"rendered":"<h1>R \uc815\uaddc\ud45c\ud604\uc2dd : \uae30\ubcf8 \uc911\uc758 \uae30\ubcf8<\/h1>\n<p>\uc815\uaddc\ud45c\ud604\uc2dd\uc5d0 \uad00\ud55c \uae00\uc774 \ub9ce\uc9c0\ub9cc, \ub300\ubd80\ubd84\uc740 \uac00\uc7a5 \uae30\ucd08\uc801\uc778 \ub0b4\uc6a9\uc744 \ube60\ud2b8\ub9ac\uace0 \uc788\ub2e4.<\/p>\n<p><strong>\u201cR \uc815\uaddc\ud45c\ud604\uc2dd\uc5d0\ub294 2\uac00\uc9c0 \uc885\ub958\uc758 \ud0c8\ucd9c\ubb38\uc790\uac00 \uc4f0\uc778\ub2e4. \ud558\ub098\ub294 \ub530\uc634\ud45c\ub97c \uc4f8 \ub54c, \ub2e4\ub978 \ud558\ub098\ub294 \uc815\uaddc\ud45c\ud604\uc2dd\uc5d0\uc11c!\u201d<\/strong><\/p>\n<p>\ub2e4\uc74c\uc758 \ucf54\ub4dc\ub97c \ubcf4\uc790.<\/p>\n<pre><code class=\"r\">print('abc\\b\\tabc')\r\ncat('abc\\b\\tabc')\r\n<\/code><\/pre>\n<p><code>'abc\\b\\tabc'<\/code> \ub294 \ubb38\uc790\uc5f4 \uc790\ub8cc\ud615\uc774\ub2e4. <code>'abc\\b\\tabc'<\/code> \ub294 \uc5ec\ub35f \ubb38\uc790\ub85c \uad6c\uc131\ub418\uc5b4 \uc788\ub2e4: <code>'a'<\/code>, <code>'b'<\/code>, <code>'c'<\/code>, <code>'\\b'<\/code>, <code>'\\t'<\/code>, <code>'a'<\/code>, <code>'b'<\/code>, <code>'c'<\/code>.<\/p>\n<p>\uc5ec\uae30\uc11c <code>'\\b'<\/code> \ub294 \ub450 \ubb38\uc790\ucc98\ub7fc \ubcf4\uc774\uc9c0\ub9cc \ub530\uc634\ud45c \uc548\uc758 <code>\\<\/code> \uc740 \ud0c8\ucd9c \ubb38\uc790\ub85c \ub2e4\uc74c \ubb38\uc790\uc640 \ud569\uccd0\uc838\uc11c \uc0c8\ub85c\uc6b4 \uc758\ubbf8\ub97c \uac16\uac8c \ub41c\ub2e4. <code>'\\b'<\/code> \ub294 \ubb38\uc790 <code>\\<\/code> \uacfc \uc544\ubb34 \uad00\ub828\uc774 \uc5c6\uace0 &lt;\ubc31\uc2a4\ud398\uc774\uc2a4&gt;\ub77c\ub294 \uc81c\uc5b4 \ubb38\uc790\ub97c \uc758\ubbf8\ud55c\ub2e4.<\/p>\n<p>R\uc740 &#8216; \ub610\ub294 \u201c \uc548\uc758 \ubb38\uc790\ub4e4\uc744 \ud574\uc11d\ud558\uac8c \ub418\ub294\ub370, <code>'\\b'<\/code> \uc740 \ubc31\uc2a4\ud398\uc774\uc2a4, <code>'\\t'<\/code> \uc740 \ud0ed\uc744 \uc758\ubbf8\ud55c\ub2e4. \ud568\uc218 <code>print<\/code> \ub294 \ubb38\uc790\uc5f4\uc744 \ucd9c\ub825\ud560 \ub54c \ub530\uc634\ud45c \uc548\uc5d0 \ucd9c\ub825\ud574\uc11c \uc81c\uc5b4 \ubb38\uc790\ub294 <code>'\\b'<\/code> \ub610\ub294 <code>'\\t'<\/code>\ub85c \ucd9c\ub825\ud558\uc9c0\ub9cc \ud568\uc218 <code>cat<\/code>\ub294 \ubb38\uc790\uc5f4\uc744 \ub530\uc634\ud45c \uc5c6\uc774 \ucd9c\ub825\ud574\uc11c \uc81c\uc5b4\ubb38\uc790\uc758 \ud6a8\uacfc\ub97c \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/p>\n<p>R\uc774 \uc774\ub7f0 \ud0c8\ucd9c \ubb38\uc790\ub97c \uc0ac\uc6a9\ud558\ub294 \uc774\uc720\ub294 \ud0a4\ubcf4\ub4dc\ub85c\ub294 \uc785\ub825\ud560 \uc218 \uc5c6\ub294 \ubb38\uc790\ub4e4\uc744 \uc785\ub825\ud558\uae30 \uc704\ud574\uc11c\uc774\ub2e4. \uc720\ub2c8\ucf54\ub4dc\uc758 \ub9ce\uc740 \ubb38\uc790\ub4e4\uc740 <code>'\\Uxxxx'<\/code>\uc640 \uac19\uc740 \ud615\uc2dd\uc73c\ub85c \uc190\uc27d\uac8c \uc785\ub825\ud560 \uc218 \uc788\ub2e4(\uc5ec\uae30\uc11c <code>xxxx<\/code>\uc740 \uc720\ub2c8\ucf54\ub4dc \ucf54\ub4dc \ud3ec\uc778\ud2b8\ub97c \ub098\ud0c0\ub0b8\ub2e4. 16\uc9c4\uc218 \uc22b\uc790).<\/p>\n<p>R\uc758 \uc815\uaddc\ud45c\ud604\uc2dd\ub3c4 \uc5ed\uc2dc \ud0c8\ucd9c \ubb38\uc790\ub97c \uc0ac\uc6a9\ud558\ub294\ub370, R\uc758 \ubb38\uc790\uc5f4\uacfc \ub3d9\uc77c\ud55c \ud0c8\ucd9c\ubb38\uc790(\ubc31\uc2ac\ub798\uc26c)\ub97c \uc0ac\uc6a9\ud558\uae30 \ub54c\ubb38\uc5d0 \uc8fc\uc758\uac00 \uc694\uad6c\ub41c\ub2e4. \ub2e4\uc74c\uc758 \uc608\ub97c \ubcf4\uc790.<\/p>\n<pre><code class=\"r\">grepl('\\e', '\\x1b')\r\ngrepl('\\\\e', '\\x1b')\r\n<\/code><\/pre>\n<pre>## Error: '\\e' is an unrecognized escape in character string starting \"'\\e\"\r\n<\/pre>\n<pre>## [1] TRUE\r\n<\/pre>\n<p>\uccab \ubc88\uc9f8 \uc904\uc740 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud558\ub294\ub370 R\uc758 \ubb38\uc790\uc5f4\uc5d0\uc11c\ub294 <code>'\\e'<\/code> \uac00 \uc5b4\ub5a4 \uc758\ubbf8\ub3c4 \uac00\uc9c0\uace0 \uc788\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc774\ub2e4. \ud558\uc9c0\ub9cc \ub450 \ubc88\uc9f8 \uc904\uc740 \uc815\uc0c1 \uc791\ub3d9\ud55c\ub2e4. \ub450 \ubc88\uc9f8 \uc904\uc758 <code>'\\\\e'<\/code>\ub97c \ubcf4\uc790. R\uc740 \ub530\uc634\ud45c \uc548\uc758 <code>'\\\\'<\/code> \ub97c \ubb38\uc790 <code>\\<\/code> (\ubc31\uc2ac\ub798\uc26c)\ub85c \ud574\uc11d\ud55c\ub2e4. \ub530\ub77c\uc11c <code>'\\\\e'<\/code> \ub294 \ubc31\uc2ac\ub798\uc26c\uc640 \ubb38\uc790 <code>e<\/code>\ub97c \uc758\ubbf8\ud55c\ub2e4. \ub530\ub77c\uc11c grepl(<code>'\\\\e'<\/code>, <code>'\\x1b'<\/code>) \uc740 \ud328\ud134 <code>\\e<\/code>\ub97c \ucc3e\ub294 \uac83\uc774\ub2e4. R \uc815\uaddc\ud45c\ud604\uc2dd\uc5d0\uc11c <code>\\<\/code> \uc740 \ud0c8\ucd9c \ubb38\uc790\uc774\uace0 <code>\\e<\/code> \uc740 ESC \ud0a4\ub97c \uc758\ubbf8\ud558\ub294\ub370, \ub300\ubd80\ubd84\uc758 \uacbd\uc6b0 <code>'\\x1b'<\/code>\uacfc \ub3d9\uc77c\ud558\ub2e4. \ub530\ub77c\uc11c \ub450 \ubc88\uc9f8 \uc904\uc740 \uc815\uc0c1 \uc791\ub3d9\ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n<p>\ud558\uc9c0\ub9cc \uc815\uaddc\ud45c\ud604\uc2dd\uc758 \ud0c8\ucd9c\ubb38\uc790\ub294 pattern=\uc758 \uc778\uc790\ub85c \uc4f0\uc77c \ub54c\uc5d0\ub9cc \uc815\uc0c1 \uc791\ub3d9\ud568\uc744 \uc720\uc758\ud558\uc790. \ub530\ub77c\uc11c <code>cat('\\e')<\/code>\uc740 \uc791\ub3d9\ud558\uc9c0 \uc54a\uace0 <code>cat('\\\\e')<\/code>\uc740 <code>\\e<\/code>\ub97c \uc758\ubbf8\ud55c\ub2e4(\ubc31\uc2ac\ub798\uc26c\uc640 \ubb38\uc790 <code>e<\/code>).<\/p>\n<p>R\uc758 \uc815\uaddc\ud45c\ud604\uc2dd\uc640 \ub530\uc634\ud45c\uc5d0 \uad00\ud574\uc11c\ub294 \ucf58\uc194\uc5d0\uc11c <code>?regex<\/code> \uacfc <code>?\"'\"<\/code> \ub97c \uc785\ub825\ud574\uc11c \ud655\uc778\ud560 \uc218 \uc788\ub2e4. \ud558\uc9c0\ub9cc \ubb38\uc11c\uac00 \uc815\ud655\ud558\uac8c \uc124\uba85\ud558\uc9c0 \ubabb\ud558\ub294 \ubd80\ubd84\uc774 \uc788\uc73c\ub2c8 \uc720\uc758\ud574\uc11c \uc77d\uc744 \ud544\uc694\uac00 \uc788\ub2e4.<\/p>\n<p>R \uc815\uaddc\ud45c\ud604\uc2dd\uc5d0\uc11c \uc4f0\uc774\ub294 \ud45c\ud604\uc758 \uc608\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n<ul>\n<li>\ub3d9\uc77c\ud55c \uae00\uc744 <a href=\"https:\/\/medium.com\/@khkim_93600\/r-%EC%A0%95%EA%B7%9C%ED%91%9C%ED%98%84%EC%8B%9D-%EA%B8%B0%EC%B4%88-6ae5f11d25bd\">Medium<\/a>\uc5d0\uc11c\ub3c4 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li>\uc704\uc758 \uae00\uc740 <a href=\"https:\/\/book.naver.com\/bookdb\/book_detail.nhn?bid=14572251\">R\ub85c \ud558\ub294 \ube45\ub370\uc774\ud130 \ubd84\uc11d: \ub370\uc774\ud130 \uc804\ucc98\ub9ac\uc640 \uc2dc\uac01\ud654-\uac1c\ub150\uc801 \uae30\ucd08\uc5d0\uc11c \uc2ec\uce35\ud65c\uc6a9\uae4c\uc9c0<\/a>\uc758 \ub0b4\uc6a9\uc744 \uac01\uc0c9\ud55c \uac83\uc785\ub2c8\ub2e4.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>R \uc815\uaddc\ud45c\ud604\uc2dd : \uae30\ubcf8 \uc911\uc758 \uae30\ubcf8 \uc815\uaddc\ud45c\ud604\uc2dd\uc5d0 \uad00\ud55c \uae00\uc774 \ub9ce\uc9c0\ub9cc, \ub300\ubd80\ubd84\uc740 \uac00\uc7a5 \uae30\ucd08\uc801\uc778 \ub0b4\uc6a9\uc744 \ube60\ud2b8\ub9ac\uace0 \uc788\ub2e4. \u201cR \uc815\uaddc\ud45c\ud604\uc2dd\uc5d0\ub294 2\uac00\uc9c0 \uc885\ub958\uc758 \ud0c8\ucd9c\ubb38\uc790\uac00 \uc4f0\uc778\ub2e4. \ud558\ub098\ub294 \ub530\uc634\ud45c\ub97c \uc4f8 \ub54c, \ub2e4\ub978 \ud558\ub098\ub294 \uc815\uaddc\ud45c\ud604\uc2dd\uc5d0\uc11c!\u201d \ub2e4\uc74c\uc758 \ucf54\ub4dc\ub97c \ubcf4\uc790. print(&#8216;abc\\b\\tabc&#8217;) cat(&#8216;abc\\b\\tabc&#8217;) &#8216;abc\\b\\tabc&#8217; \ub294 \ubb38\uc790\uc5f4 \uc790\ub8cc\ud615\uc774\ub2e4. &#8216;abc\\b\\tabc&#8217; \ub294 \uc5ec\ub35f \ubb38\uc790\ub85c \uad6c\uc131\ub418\uc5b4 \uc788\ub2e4: &#8216;a&#8217;, &#8216;b&#8217;, &#8216;c&#8217;, &#8216;\\b&#8217;, &#8216;\\t&#8217;, &#8216;a&#8217;, &#8216;b&#8217;, &#8216;c&#8217;. \uc5ec\uae30\uc11c &#8216;\\b&#8217; \ub294 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":964,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[28,79],"tags":[20,181,59,180],"jetpack_featured_media_url":"http:\/\/ds.sumeun.org\/wp-content\/uploads\/2019\/02\/greplerror-1.png","_links":{"self":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts\/960"}],"collection":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=960"}],"version-history":[{"count":2,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts\/960\/revisions"}],"predecessor-version":[{"id":963,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts\/960\/revisions\/963"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/media\/964"}],"wp:attachment":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=960"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}