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Do you mean something like `.agg(pl.col("foo").diff())`?

Or is diff aggregation its own thing? (I tried searching for the term, but didn't find much.)

Nevermind, it has it but it's under Computation in polars.Series.diff and I was looking under Aggregation. This is great.

For instance you've got a time series with an odometer value and you want the a delta from the previous sample to compute the every trip.