In our meeting on 24 February 2021 we discussed profiling and comparing of code running on data.table versus data.frame. Code and timing for examples are below. Comparison of multiple versions of R ...

See how to join two data sets by one or more common columns using base R’s merge function, dplyr join functions, and the speedy data.table package. R has a number of quick, elegant ways to join data ...

Combining multiple datasets, whether by stacking or joining, is commonly necessary as is changing the shape of data. The plyr and reshape2 packages offer good functions for accomplishing this in ...