{"id":23111,"date":"2022-11-24T01:20:17","date_gmt":"2022-11-23T19:50:17","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-loop-in-r-to-get-specific-columns-and-the-sum-of-the-rest-from-different-csv-files\/"},"modified":"2022-11-24T01:20:17","modified_gmt":"2022-11-23T19:50:17","slug":"solved-loop-in-r-to-get-specific-columns-and-the-sum-of-the-rest-from-different-csv-files","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-loop-in-r-to-get-specific-columns-and-the-sum-of-the-rest-from-different-csv-files\/","title":{"rendered":"[Solved] Loop in R to get specific columns and the sum of the rest from different .csv files"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51277178\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51277178\" data-parentid=\"51274821\" 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>First put all files in a single folder.  <\/p>\n<pre><code>filenames &lt;- list.files(pattern = \".csv\")\n\nall &lt;- lapply(filenames, function(name) {\n  readr:: read_csv(name)\n})\n<\/code><\/pre>\n<p>Based on your description the list should have a length of 300, each item containing a dataframe. If you want to bind the rows of all dataframes you can use dplyr&#8217;s bind_rows(). Below is a solution based on an example dataset with 4 cols per dataset. <\/p>\n<pre><code># assumed dataset post importing into a list from step 1\nlistOfDataFrames &lt;- vector(mode = \"list\", length = 4)\n\nfor (i in 1:4) {\n  listOfDataFrames[[i]] &lt;- data.frame(Col1=sample(letters, 5, rep=F),\n                                      Col2=rnorm(5), Col3=rnorm(5))\n}\n\n\nall_df &lt;- dplyr::bind_rows(listOfDataFrames)\nrequired_df &lt;- all_df[,1:2]\nsum_of_cols &lt;- apply(all_df[,3:4], 2, sum)\n<\/code><\/pre>\n<p>===== edited answer based on new information =====  <\/p>\n<p>If all your csv files d001 to d300 are in the same folder you can apply the same principles that I have shared above (I&#8217;m not sure about the efficiency of the code, but it should still work).<br \/>\nStep 1: load all data frames into a single list<br \/>\nStep 2: loop through the list performing the same transformation on all dataframes (each element of list)<br \/>\nStep 3: loop through list writing each element of list into a separate csv file  <\/p>\n<p>Here is an example code:  <\/p>\n<pre><code>filenames &lt;- list.files(pattern = \".csv\")\n\nall &lt;- lapply(filenames, function(name) {\n  readr:: read_csv(name)\n})\n\n\nall_transformed &lt;- lapply(all, function(df) {\n  transmute(df, i, j, sum = sum(h01:h24, na.rm = TRUE))\n})\n\nnames(all_transformed) &lt;- paste0(\"d\",1:length(all_transformed))\nlapply(1:length(all_transformed), function(i) write.csv(all_transformed[[i]], \n                                                file = paste0(names(all_transformed[i]), \".csv\"),\n                                                row.names = FALSE))\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Loop in R to get specific columns and the sum of the rest from different .csv files <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] First put all files in a single folder. filenames &lt;- list.files(pattern = &#8220;.csv&#8221;) all &lt;- lapply(filenames, function(name) { readr:: read_csv(name) }) Based on your description the list should have a length of 300, each item containing a dataframe. If you want to bind the rows of all dataframes you can use dplyr&#8217;s bind_rows(). Below &#8230; <a title=\"[Solved] Loop in R to get specific columns and the sum of the rest from different .csv files\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-loop-in-r-to-get-specific-columns-and-the-sum-of-the-rest-from-different-csv-files\/\" aria-label=\"More on [Solved] Loop in R to get specific columns and the sum of the rest from different .csv files\">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":[483,391,321],"class_list":["post-23111","post","type-post","status-publish","format-standard","hentry","category-solved","tag-csv","tag-loops","tag-r"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] Loop in R to get specific columns and the sum of the rest from different .csv files - 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-loop-in-r-to-get-specific-columns-and-the-sum-of-the-rest-from-different-csv-files\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Loop in R to get specific columns and the sum of the rest from different .csv files - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] First put all files in a single folder. filenames &lt;- list.files(pattern = &quot;.csv&quot;) all &lt;- lapply(filenames, function(name) { readr:: read_csv(name) }) Based on your description the list should have a length of 300, each item containing a dataframe. 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