{"id":15307,"date":"2022-10-11T04:16:32","date_gmt":"2022-10-10T22:46:32","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-scraping-data-off-site-using-4-urls-for-one-day-using-r\/"},"modified":"2022-10-11T04:16:32","modified_gmt":"2022-10-10T22:46:32","slug":"solved-scraping-data-off-site-using-4-urls-for-one-day-using-r","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-scraping-data-off-site-using-4-urls-for-one-day-using-r\/","title":{"rendered":"[Solved] Scraping data off site using 4 urls for one day using R"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-28830343\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"28830343\" data-parentid=\"28823270\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You can turn all the tables into a wide data frame with list operations:<\/p>\n<pre><code>library(rvest)\nlibrary(magrittr)\nlibrary(dplyr)\n\ndate &lt;- 20130701\nrng &lt;- c(1:4)\n\nmy_tabs &lt;- lapply(rng, function(i) {\n  url &lt;- sprintf(\"http:\/\/apims.doe.gov.my\/apims\/hourly%d.php?date=%s\", i, date)\n  pg &lt;- html(url)\n  pg %&gt;% html_nodes(\"table\") %&gt;% extract2(1) %&gt;% html_table(header=TRUE)\n})\n\nglimpse(plyr::join_all(my_tabs, by=colnames(my_tabs[[1]][1:2])))\n\n## Observations: 52\n## Variables:\n## $ NEGERI \/ STATE   (chr) \"Johor\", \"Johor\", \"Johor\", \"Johor\", \"Kedah...\n## $ KAWASAN\/AREA     (chr) \"Kota Tinggi\", \"Larkin Lama\", \"Muar\", \"Pas...\n## $ MASA\/TIME12:00AM (chr) \"63*\", \"53*\", \"51*\", \"55*\", \"37*\", \"48*\", ...\n## $ MASA\/TIME01:00AM (chr) \"62*\", \"52*\", \"52*\", \"55*\", \"36*\", \"48*\", ...\n## $ MASA\/TIME02:00AM (chr) \"61*\", \"51*\", \"53*\", \"55*\", \"35*\", \"48*\", ...\n## $ MASA\/TIME03:00AM (chr) \"60*\", \"50*\", \"54*\", \"55*\", \"35*\", \"48*\", ...\n## $ MASA\/TIME04:00AM (chr) \"59*\", \"49*\", \"54*\", \"54*\", \"34*\", \"47*\", ...\n## $ MASA\/TIME05:00AM (chr) \"58*\", \"48*\", \"54*\", \"54*\", \"34*\", \"45*\", ...\n## $ MASA\/TIME06:00AM (chr) \"57*\", \"47*\", \"53*\", \"53*\", \"33*\", \"45*\", ...\n## $ MASA\/TIME07:00AM (chr) \"57*\", \"46*\", \"52*\", \"53*\", \"32*\", \"45*\", ...\n## $ MASA\/TIME08:00AM (chr) \"56*\", \"45*\", \"52*\", \"52*\", \"32*\", \"44*\", ...\n## ...\n<\/code><\/pre>\n<p>I rarely actually load\/use <code>plyr<\/code> anymore due to naming collisions with <code>dplyr<\/code> but <code>join_all<\/code> is perfect for this situation.<\/p>\n<p>It&#8217;s also likely you&#8217;ll need this data in long format:<\/p>\n<pre><code>plyr::join_all(my_tabs, by=colnames(my_tabs[[1]][1:2])) %&gt;% \n  tidyr::gather(masa, nilai, -1, -2) %&gt;%\n# better column names\n  rename(nigeri=`NEGERI \/ STATE`, kawasan=`KAWASAN\/AREA`) %&gt;%  \n# cleanup &amp; convert time (using local timezone)\n# make readings numeric; NA will sub for #\n  mutate(masa=gsub(\"MASA\/TIME\", \"\", masa), \n         masa=as.POSIXct(sprintf(\"%s %s\", date, masa), format=\"%Y%m%d %H:%M%p\", tz=\"Asia\/Kuala_Lumpur\"),\n         nilai=as.numeric(gsub(\"[[:punct:]]+\", \"\", nilai))) -&gt; pollut\n\nhead(pollut)\n##   nigeri                 kawasan                masa nilai\n## 1  Johor             Kota Tinggi 2013-07-01 12:00:00    63\n## 2  Johor             Larkin Lama 2013-07-01 12:00:00    53\n## 3  Johor                    Muar 2013-07-01 12:00:00    51\n## 4  Johor            Pasir Gudang 2013-07-01 12:00:00    55\n## 5  Kedah              Alor Setar 2013-07-01 12:00:00    37\n## 6  Kedah Bakar Arang, Sg. Petani 2013-07-01 12:00:00    48\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">6<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Scraping data off site using 4 urls for one day using R <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You can turn all the tables into a wide data frame with list operations: library(rvest) library(magrittr) library(dplyr) date &lt;- 20130701 rng &lt;- c(1:4) my_tabs &lt;- lapply(rng, function(i) { url &lt;- sprintf(&#8220;http:\/\/apims.doe.gov.my\/apims\/hourly%d.php?date=%s&#8221;, i, date) pg &lt;- html(url) pg %&gt;% html_nodes(&#8220;table&#8221;) %&gt;% extract2(1) %&gt;% html_table(header=TRUE) }) glimpse(plyr::join_all(my_tabs, by=colnames(my_tabs[[1]][1:2]))) ## Observations: 52 ## Variables: ## $ NEGERI &#8230; <a title=\"[Solved] Scraping data off site using 4 urls for one day using R\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-scraping-data-off-site-using-4-urls-for-one-day-using-r\/\" aria-label=\"More on [Solved] Scraping data off site using 4 urls for one day using R\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[321,3958,760],"class_list":["post-15307","post","type-post","status-publish","format-standard","hentry","category-solved","tag-r","tag-rvest","tag-web-scraping"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Scraping data off site using 4 urls for one day using R - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-scraping-data-off-site-using-4-urls-for-one-day-using-r\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Scraping data off site using 4 urls for one day using R - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You can turn all the tables into a wide data frame with list operations: library(rvest) library(magrittr) library(dplyr) date &lt;- 20130701 rng &lt;- c(1:4) my_tabs &lt;- lapply(rng, function(i) { url &lt;- sprintf(&quot;http:\/\/apims.doe.gov.my\/apims\/hourly%d.php?date=%s&quot;, i, date) pg &lt;- html(url) pg %&gt;% html_nodes(&quot;table&quot;) %&gt;% extract2(1) %&gt;% html_table(header=TRUE) }) glimpse(plyr::join_all(my_tabs, by=colnames(my_tabs[[1]][1:2]))) ## Observations: 52 ## Variables: ## $ NEGERI ... 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JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-scraping-data-off-site-using-4-urls-for-one-day-using-r\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Scraping data off site using 4 urls for one day using R - JassWeb","og_description":"[ad_1] You can turn all the tables into a wide data frame with list operations: library(rvest) library(magrittr) library(dplyr) date &lt;- 20130701 rng &lt;- c(1:4) my_tabs &lt;- lapply(rng, function(i) { url &lt;- sprintf(\"http:\/\/apims.doe.gov.my\/apims\/hourly%d.php?date=%s\", i, date) pg &lt;- html(url) pg %&gt;% html_nodes(\"table\") %&gt;% extract2(1) %&gt;% html_table(header=TRUE) }) glimpse(plyr::join_all(my_tabs, by=colnames(my_tabs[[1]][1:2]))) ## Observations: 52 ## Variables: ## $ NEGERI ... 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