How to select the row with the maximum value in each group

Question

In a dataset with multiple observations for each subject I want to take a subset with only the maximum data value for each record. For example, with a following dataset:

Answer 1

Another base solution

group_sorted <- group[order(group$Subject, -group$pt),]
group_sorted[!duplicated(group_sorted$Subject),]

# Subject pt Event
#       1  5     2
#       2 17     2
#       3  5     2

Order the data frame by pt (descending) and then remove rows duplicated in Subject