我想创建一个滚动函数，有条件地计算上一行中两列的出现。
例如，我有一个数据集，如下所示。
# Generate data
set.seed(123)
test <- data.frame(
Round = rep(1:5, times = 3),
Team = rep(c("Team 1", "Team 2", "Team 3"), each = 5),
Venue = sample(sample(c("Venue A", "Venue B"), 15, replace = T))
)
Round Team Venue
1 1 Team 1 Venue B
2 2 Team 1 Venue B
3 3 Team 1 Venue A
4 4 Team 1 Venue A
5 5 Team 1 Venue B
6 1 Team 2 Venue B
7 2 Team 2 …