Ptt 大爆卦 | R if - 前往 https://stackoverflow.com/questions/25640161/r-how-to-test-for-character0-in-if-statement

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並前往https://stackoverflow.com/questions/25640161/r-how-to-test-for-character0-in-if-statement

R - How to test for character(0) in IF statement - Stack Overflow

Use the identical function to check this. a <- character(0) identical(a, character(0)) # returns TRUE identical(a, "") # returns FALSE ...

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