This will find all rows in the mtcars sample data frame that have an mpg greater than 20, ordered from highest to lowest mpg. Examine and edit data with a GUI.

R lets you slice your data sets in various ways, depending on the data type. To select just certain columns from a data frame, you can either refer to the columns by name or by their location (i.e ...

R has a number of quick, elegant ways to join data frames by a common column. I’d like to show you three of them: base R’s merge() function; dplyr’s join family of functions; data.table’s ...