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write a function called nth.na(x,n) which takes a vector x and returns either (a) hte index of nth-NA which occurs in x or (b) NA if there are fewer than n missing values in x

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关键词：R编程 function missing Returns occurs function returns either called occurs

1. nth.na<-function(x,n) ifelse(sum(is.na(x))<n, NA, which(is.na(x))[n])

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