{"id":30674,"date":"2023-01-16T09:49:35","date_gmt":"2023-01-16T04:19:35","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-r-replace-the-whole-part-of-a-number-but-keep-the-decimal-part-unchanged\/"},"modified":"2023-01-16T09:49:35","modified_gmt":"2023-01-16T04:19:35","slug":"solved-r-replace-the-whole-part-of-a-number-but-keep-the-decimal-part-unchanged","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-r-replace-the-whole-part-of-a-number-but-keep-the-decimal-part-unchanged\/","title":{"rendered":"[Solved] R: replace the whole part of a number but keep the decimal part unchanged"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-30493847\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"30493847\" data-parentid=\"30493467\" data-score=\"1\" 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>The commenters are right. It doesn&#8217;t matter how long the list of numbers is. <code>R<\/code> can do the operation in one go.<\/p>\n<pre><code>x &lt;- c(25.01, 25.8, 25.4)\nx-15\n[1] 10.01 10.80 10.40\n<\/code><\/pre>\n<p>If you do run into a situation with many wide-ranging numbers and need to literally keep what comes after the decimal and pick a number to put in front, use something like this:<\/p>\n<pre><code>keep.decimal &lt;- function(x, n=10) {\n  paste0(n, gsub('\\\\d*(\\\\.\\\\d*)', '\\\\1', x))\n}\n<\/code><\/pre>\n<p>Then you can even choose which number you want in front of it.<\/p>\n<pre><code>keep.decimal(x)\n[1] \"10.01\" \"10.8\"  \"10.4\" \nkeep.decimal(x, 50)\n[1] \"50.01\" \"50.8\"  \"50.4\" \n<\/code><\/pre>\n<h1>Explanation of vectorization<\/h1>\n<p>When a vector is defined like <code>x &lt;- 1:5<\/code>, <code>R<\/code> will attempt to execute operations element by element when possible. If <code>2<\/code> had to be added to each element of <code>x<\/code> and assigned to a new variable <code>y<\/code>, it might be difficult with a <code>for<\/code> loop:<\/p>\n<pre><code>y &lt;- NULL\nfor (i in 1:length(x)) {\n  y[i] &lt;- x[i] + 2\n}\ny\n[1] 3 4 5 6 7\n<\/code><\/pre>\n<p>But with <code>R<\/code>, this operation is simplified to:<\/p>\n<pre><code>y &lt;- x + 2\n<\/code><\/pre>\n<p>This operational technique extends further than arithmetic. Here&#8217;s a problem to solve, write an expression that matches a lowercase letter to its capitalized counterpart. So turn this:<\/p>\n<pre><code>x &lt;- c(\"a\", \"b\", \"c\")\nx\n[1] \"a\" \"b\" \"d\"\n<\/code><\/pre>\n<p>Into<\/p>\n<pre><code>y\n[1] \"aA\" \"bB\" \"dD\"\n<\/code><\/pre>\n<p>I can write<\/p>\n<pre><code>y &lt;- paste0(x, LETTERS[match(x, letters)])\ny\n[1] \"aA\" \"bB\" \"dD\"\n<\/code><\/pre>\n<p>Instead of:<\/p>\n<pre><code>y &lt;- NULL\nfor(i in 1:length(x)) {\n  y[i] &lt;- paste0(x[i], LETTERS[match(x[i], letters)])\n}\ny\n[1] \"aA\" \"bB\" \"dD\"\n<\/code><\/pre>\n<p>It is much faster too. As an analogy, think of restaurant service. <code>R<\/code> is your server ready to fetch what you want. If you ask your server for ketchup, they get the ketchup and deliver it. Then you ask for a napkin. They go back to get the napkin and deliver it. Then you ask for a refill. <\/p>\n<p>This process takes a long time. If you would have asked for ketchup, a napkin, and a refill at the same time, the server would be able to optimize their trip to get what you want fastest. <code>R<\/code> has optimized functions built in the &#8216;C&#8217; language that are lightning fast, and we exploit that speed every time we vectorize.<\/p>\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 R: replace the whole part of a number but keep the decimal part unchanged <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The commenters are right. It doesn&#8217;t matter how long the list of numbers is. R can do the operation in one go. x &lt;- c(25.01, 25.8, 25.4) x-15 [1] 10.01 10.80 10.40 If you do run into a situation with many wide-ranging numbers and need to literally keep what comes after the decimal and &#8230; <a title=\"[Solved] R: replace the whole part of a number but keep the decimal part unchanged\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-r-replace-the-whole-part-of-a-number-but-keep-the-decimal-part-unchanged\/\" aria-label=\"More on [Solved] R: replace the whole part of a number but keep the decimal part unchanged\">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":[634,5236,738,321],"class_list":["post-30674","post","type-post","status-publish","format-standard","hentry","category-solved","tag-decimal","tag-decimalformat","tag-numbers","tag-r"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] R: replace the whole part of a number but keep the decimal part unchanged - 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-r-replace-the-whole-part-of-a-number-but-keep-the-decimal-part-unchanged\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] R: replace the whole part of a number but keep the decimal part unchanged - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The commenters are right. 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