SE問題與條件mutate

Question

我想做一個簡單的條件與mutate。

代碼應該基於來自同一數據框的兩個變量創建一個名爲「性別」的新變量。

sample <- data.frame(
    client = c("john", "peter", "hanna", "lisa"), 
    id = c(100, 400, 650, 700), 
    resident = c('YES', 'YES', 'YES', 'NO')) 

male_index <- as.vector(000:499) 
female_index <- as.vector(500:999) 

sample <- sample %>% 
    mutate(gender = ifelse(resident == "YES" & id %in% male_index, "Male", 
    mutate(gender = ifelse(resident == "YES" & id %in% female_index, "Female", "Female")))) 

我收到以下錯誤，我不明白。我想這與SE有關。但我還是不那麼熟悉R.

錯誤mutate_impl（。數據，點）：
說法「數據」丟失，沒有默認值

我不如果我使用單個mutate語句運行代碼，可以獲得任何問題。

Answer 1

您不需要在您的ifelse中撥打第二個mutate電話。

sample <- data.frame(
    client = c("john", "peter", "hanna", "lisa"), 
    id = c(100, 400, 650, 700), 
    resident = c('YES', 'YES', 'YES', 'NO') 
) 

male_index <- as.vector(000:499) 
female_index <- as.vector(500:999) 

sample <- sample %>% 
    mutate(gender = ifelse(
    resident == "YES" & id %in% male_index, 
    "Male", 
    ifelse(resident == "YES" & 
      id %in% female_index, "Female", "Non-resident") 
)) 

現在數據集中的每個人都有一個爲gender分配的值。

sample 
# client id resident gender 
#1 john 100  YES Male 
#2 peter 400  YES Male 
#3 hanna 650  YES Female 
#4 lisa 700  NO Non-resident