IT Nursery
.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What...
I’m having a little trouble understanding the pass-by-reference properties of data.table. Some operations seem to ‘break’ the reference, and I’d like to understand exactly what’s happening. On creating a...
To get rid of a column named “foo” in a data.frame, I can do: df <- df[-grep('foo', colnames(df))] However, once df is converted to a data.table object, there is...
Overview I’m relatively familiar with data.table, not so much with dplyr. I’ve read through some dplyr vignettes and examples that have popped up on SO, and so far my...