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.

Deze oefening maakt deel uit van de cursus

Scalable Data Processing in R

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Oefeninstructies

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.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

# Split the mortgage data by year
spl <- ___

# Use foldable_range() to get the range of the record numbers
foldable_range(___(function(s) ___(mort[s, "record_number"]), ___))

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