{"id":14491,"date":"2022-10-08T01:02:50","date_gmt":"2022-10-07T19:32:50","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-substitute-lhs-of-in-r\/"},"modified":"2022-10-08T01:02:50","modified_gmt":"2022-10-07T19:32:50","slug":"solved-substitute-lhs-of-in-r","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-substitute-lhs-of-in-r\/","title":{"rendered":"[Solved] Substitute LHS of = in R"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-25950861\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"25950861\" data-parentid=\"25944762\" 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><strong>1) eval\/parse<\/strong> Create a <code>cmd<\/code> string, parse it and evaluate it:<\/p>\n<pre><code>f2 &lt;- function(DF, x, env = parent.frame()){\n  cmd &lt;- sprintf(\"mutate(%s, %s = mean(v1))\", deparse(substitute(DF)), x)\n  eval(parse(text = cmd), env)\n}\n\nf2(DF, \"v1_name\")\n<\/code><\/pre>\n<p>giving<\/p>\n<pre><code>  v1 v1_mean\n1  1       2\n2  2       2\n3  3       2\n... etc ...\n<\/code><\/pre>\n<p><strong>2) eval\/as.call<\/strong> Another way is to construct a list, convert it to a call and evaluate it.  (This is also the approach that <code>mutate_each_q<\/code> in dplyr takes.)<\/p>\n<pre><code>f3 &lt;- function(DF, x, env = parent.frame()) {\n    L &lt;- list(quote(mutate), .data = substitute(DF), quote(mean(v1)))\n    names(L)[3] &lt;- x\n    eval(as.call(L), env)\n}\n\nf3(DF, \"v1_name\")\n<\/code><\/pre>\n<p><strong>3) do.call<\/strong>  We form a list equal to the last two components of the list in the prior solution and then use <code>do.call<\/code> :<\/p>\n<pre><code>f3 &lt;- function(DF, x, env = parent.frame()) {\n    L &lt;- list(.data = substitute(DF), quote(mean(v1)))\n    names(L)[2] &lt;- x\n    do.call(mutate, L)\n}\n\nf3(DF, \"v1_name\")\n<\/code><\/pre>\n<p><strong>Upodate<\/strong> Added additional solutions.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Substitute LHS of = in R <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] 1) eval\/parse Create a cmd string, parse it and evaluate it: f2 &lt;- function(DF, x, env = parent.frame()){ cmd &lt;- sprintf(&#8220;mutate(%s, %s = mean(v1))&#8221;, deparse(substitute(DF)), x) eval(parse(text = cmd), env) } f2(DF, &#8220;v1_name&#8221;) giving v1 v1_mean 1 1 2 2 2 2 3 3 2 &#8230; etc &#8230; 2) eval\/as.call Another way is to &#8230; <a title=\"[Solved] Substitute LHS of = in R\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-substitute-lhs-of-in-r\/\" aria-label=\"More on [Solved] Substitute LHS of = in 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":[1256,321,2493],"class_list":["post-14491","post","type-post","status-publish","format-standard","hentry","category-solved","tag-dplyr","tag-r","tag-substitution"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Substitute LHS of = in 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-substitute-lhs-of-in-r\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Substitute LHS of = in R - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] 1) eval\/parse Create a cmd string, parse it and evaluate it: f2 &lt;- function(DF, x, env = parent.frame()){ cmd &lt;- sprintf(&quot;mutate(%s, %s = mean(v1))&quot;, deparse(substitute(DF)), x) eval(parse(text = cmd), env) } f2(DF, &quot;v1_name&quot;) giving v1 v1_mean 1 1 2 2 2 2 3 3 2 ... etc ... 2) eval\/as.call Another way is to ... 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