{"id":14020,"date":"2022-10-06T06:18:37","date_gmt":"2022-10-06T00:48:37","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-r-transforming-one-column-to-another-closed\/"},"modified":"2022-10-06T06:18:37","modified_gmt":"2022-10-06T00:48:37","slug":"solved-r-transforming-one-column-to-another-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-r-transforming-one-column-to-another-closed\/","title":{"rendered":"[Solved] R: transforming one column to another [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-39193513\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"39193513\" data-parentid=\"39193178\" 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>This should work if your logic is whenever there is <code>1<\/code> in column <code>x<\/code> fill <code>y<\/code> with <code>1<\/code> forward until there is <code>-1<\/code> in column <code>x<\/code> from where fill <code>y<\/code> with <code>0<\/code> and vice versa:<\/p>\n<p>Since you are trying to <code>fill forward<\/code> vectors with previous values, you may want to use <code>na.locf<\/code>(last observation carried forward) function from <code>zoo<\/code> package and set up threshold values before filling forward, which is the first line doing: set the value to be <code>1<\/code> when <code>x == 1<\/code> and <code>0<\/code> when <code>x == -1<\/code> and otherwise set it to be <code>NA<\/code> for <code>na.locf<\/code> to work properly. The first element will be an exception from your output, it seems that you want the default to be zero if none of 1 and -1 exist, and that is what the second line is doing here. After setting up the threshold in the <code>y<\/code> column, filling it forward would be straight forward with <code>na.locf<\/code>:<\/p>\n<pre><code>df$y &lt;- with(df, ifelse(x == 1, 1, ifelse(x == -1, 0, NA)))\ndf$y[1] &lt;- if(df$x[1] != 1) 0 else df$y[1]\ndf$y &lt;- zoo::na.locf(df$y)\n\ndf\n#     x y\n# 1   0 0\n# 2   0 0\n# 3   1 1\n# 4   0 1\n# 5   0 1\n# 6   1 1\n# 7   0 1\n# 8   0 1\n# 9  -1 0\n# 10  0 0\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved R: transforming one column to another [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] This should work if your logic is whenever there is 1 in column x fill y with 1 forward until there is -1 in column x from where fill y with 0 and vice versa: Since you are trying to fill forward vectors with previous values, you may want to use na.locf(last observation carried &#8230; <a title=\"[Solved] R: transforming one column to another [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-r-transforming-one-column-to-another-closed\/\" aria-label=\"More on [Solved] R: transforming one column to another [closed]\">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-14020","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] R: transforming one column to another [closed] - 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-transforming-one-column-to-another-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] R: transforming one column to another [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This should work if your logic is whenever there is 1 in column x fill y with 1 forward until there is -1 in column x from where fill y with 0 and vice versa: Since you are trying to fill forward vectors with previous values, you may want to use na.locf(last observation carried ... 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