将您在盈利天数中赢得的金额分配给变量poker_winning_days

Question

# Poker winnings from Monday to Friday
poker_vector <- c(140, -50, 20, -120, 240)

# Roulette winnings from Monday to Friday
roulette_vector <- c(-24, -50, 100, -350, 10)

# Give names to both 'poker_vector' and 'roulette_vector'
days_vector <- c("Monday", "Tuesday", "Wednesday", "Thursday", "Friday")
names(roulette_vector) <- days_vector
names(poker_vector) <- days_vector

# What days of the week did you make money on poker?
selection_vector <- poker_vector > 0

# Select from poker_vector these days
poker_winning_days <- 

我知道selection_vector是答案的一部分。只是不知道从那里往哪里走。谢谢!

Answer 1

由于OP已经创建了selection_vector，我们可以这样做

names(selection_vector)[selection_vector]

注意:尽管不需要在全局环境中创建一个单独的对象，但是对于一个包含7个元素的向量来说，这并没有什么坏处。