data.table Archives - IT Nursery

Programming, r

IT Nursery

What does .SD stand for in data.table in R

.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there ...

June 4, 2022
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Programming, r

IT Nursery

Understanding exactly when a data.table is a reference to (vs a copy of) another data.table

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 ...

May 28, 2022
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How do you delete a column by name in data.table?

To get rid of a column named “foo” in a data.frame, I can do: df <- df...

May 26, 2022
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data.table vs dplyr: can one do something well the other can’t or does poorly?

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 ...

April 19, 2022
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