Split
To calculate the proportions for all years, you will use the function female_residence_prop()
defined in the previous exercise along with three other functions:
split()
: To "split" themort
data by yearMap()
: To "apply" the functionfemale_residence_prop()
to each of the subsets returned fromsplit()
Reduce()
: To combine the results obtained fromMap()
In this exercise, you will "split" the mort
data by year.
This exercise is part of the course
Scalable Data Processing in R
Exercise instructions
- Split the row numbers of the mortgage data by the
"year"
column and assign the result tospl
. - Call
str()
onspl
to see the results.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Split the row numbers of the mortage data by year
spl <- ___(1:nrow(___), mort[, ___])
# Call str on spl
___