Exercise

Foldable operations (II)

Now, you'll use the function on partitions of the data set. You should realize that by performing this operation in pieces and then aggregating, you don't need to have all of the data in a variable at once. This point isn't that important with small data sets, like the mortgage sample data, but it is for large data sets.

Instructions

100 XP

The foldable_range() function is available in your workspace.

Split the rows of mort by the "year" column.
Use foldable_range() to get the range of the "record_number" column chunked by year.