The following types of code regions are automatically foldable within RStudio: Braced regions (function definitions, conditional blocks, etc.) #' Expand the Rows of a Dataset #' #' Expands (replicates) the rows of a `data.frame` or `data.table`, either by a #' fixed number, a specified vector, or a value contained in one of the columns #' in the source `data.frame` or `data.table`. Expand Data Frame. Add Column. Keyboard Shortcuts This information is available directly in the RStudio IDE under the Tools menu: Tools → Keyboard Shortcuts Help. Content tagged with expand rows. Code chunks within R Sweave or R Markdown documents 1. Reshaping Your Data with tidyr. A data frame can be expanded by adding columns and rows. Foldable Regions. Concatenate two or more Strings in R. While concatenating strings in R, we can choose the separator and number number of input strings. Re: how to expand selected row on button click or rowselect event in an af:listview. , expand rows. #' #' #' @param dataset The input `data.frame` or `data.table`. Although many fundamental data processing functions exist in R, they have been a bit convoluted to date and have lacked consistent coding and the ability to easily flow together. You can expand the folded region by either clicking on the arrow in the gutter or on the icon that overlays the folded code. Following examples demonstrate different scenarios while concatenating strings in R using paste() function. Source: R/separate-rows.R separate_rows.Rd If a variable contains observations with multiple delimited values, this separates the values and places each one in its own row. A simple way to repeat, replicate, or explode data.table rows in R Farhan R January 31, 2014 February 4, 2015 3 Minutes Note: I found this technique on an old forum post somewhere a while back. Example: Concatenate Strings in R. 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