R 포함연산자 %in%

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3 %in% c(1,2,3)

[1] TRUE

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5 %in% c(1,2,3)

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fruits = c("Apple", "Banana", "Orange")
print("Apple" %in% fruits)

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fruits = c("Apple", "Banana", "Orange")
print("Melon" %in% fruits)

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x <- c('월','화','수','목','금','토','일')
x %in% c('토','일')

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x <- c('월','화','수','목','금','토','일')
ifelse(x %in% c('토','일'),"주말","평일")

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