More vapply()
The difference between vapply()
and sapply()
was shown in the last example to demonstrate vapply()
appropriately failing, but what about when it doesn't fail? When there are no errors, vapply()
returns a simplified result according to the FUN.VALUE
argument.
The stock_return
dataset containing daily returns for Apple, IBM, and Microsoft has been provided. The sharpe()
function is also available.
This exercise is part of the course
Intermediate R for Finance
Exercise instructions
- Calculate the sharpe ratio for each stock using
vapply()
. - Use
summary()
on theapple
column to get a 6 number summary. vapply()
thesummary()
function acrossstock_return
to summarize each column.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Sharpe ratio for all stocks
vapply(___, ___, FUN.VALUE = numeric(___))
# Summarize Apple
___
# Summarize all stocks
vapply(___, ___, FUN.VALUE = numeric(___))