{"id":12716,"date":"2022-10-01T16:25:10","date_gmt":"2022-10-01T10:55:10","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-selecting-a-unique-value-from-an-r-data-frame\/"},"modified":"2022-10-01T16:25:10","modified_gmt":"2022-10-01T10:55:10","slug":"solved-selecting-a-unique-value-from-an-r-data-frame","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-selecting-a-unique-value-from-an-r-data-frame\/","title":{"rendered":"[Solved] Selecting a unique value from an R data frame"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-31325844\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"31325844\" data-parentid=\"31323517\" data-score=\"3\" 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>Using data.table:<\/p>\n<p>(Edited to reflect @Frank&#8217;s comments)<\/p>\n<p><code>DT[, Benchmark := Value[Category == \"Time\"][which.min(Number[Category == \"Time\"])], by = FileName]<\/code><\/p>\n<p><strong>Breaking this down:<\/strong><\/p>\n<p><code>Number[Category == \"Time\"]<\/code><\/p>\n<ul>\n<li>Take all <code>Number<\/code> where <code>Category == Time<\/code><\/li>\n<\/ul>\n<p><code>which.min(^^^)<\/code><\/p>\n<ul>\n<li>Find which one is the minimum<\/li>\n<\/ul>\n<p><code>Benchmark := Value[Category == \"Time\"][^^^]<\/code><\/p>\n<ul>\n<li>Set the new column of benchmark to the value at this minimum<\/li>\n<\/ul>\n<p><code>by = FileName<\/code><\/p>\n<ul>\n<li>Do this by group<\/li>\n<\/ul>\n<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">23<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Selecting a unique value from an R data frame <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Using data.table: (Edited to reflect @Frank&#8217;s comments) DT[, Benchmark := Value[Category == &#8220;Time&#8221;][which.min(Number[Category == &#8220;Time&#8221;])], by = FileName] Breaking this down: Number[Category == &#8220;Time&#8221;] Take all Number where Category == Time which.min(^^^) Find which one is the minimum Benchmark := Value[Category == &#8220;Time&#8221;][^^^] Set the new column of benchmark to the value at this &#8230; <a title=\"[Solved] Selecting a unique value from an R data frame\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-selecting-a-unique-value-from-an-r-data-frame\/\" aria-label=\"More on [Solved] Selecting a unique value from an R data frame\">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],"class_list":["post-12716","post","type-post","status-publish","format-standard","hentry","category-solved","tag-r"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Selecting a unique value from an R data frame - 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-selecting-a-unique-value-from-an-r-data-frame\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Selecting a unique value from an R data frame - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Using data.table: (Edited to reflect @Frank&#8217;s comments) DT[, Benchmark := Value[Category == &quot;Time&quot;][which.min(Number[Category == &quot;Time&quot;])], by = FileName] Breaking this down: Number[Category == &quot;Time&quot;] Take all Number where Category == Time which.min(^^^) Find which one is the minimum Benchmark := Value[Category == &quot;Time&quot;][^^^] Set the new column of benchmark to the value at this ... 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