字符處理函數(shù) 函 數(shù) 描 述 nchar(x) 計算 x 中的字符數(shù)量 x <- c("ab", "cde", "fghij") length(...
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字符處理函數(shù) 函 數(shù) 描 述 nchar(x) 計算 x 中的字符數(shù)量 x <- c("ab", "cde", "fghij") length(...
Reduce 函數(shù) Reduce(intersect, list(v1 = c("a","b","c","d"), v2 = c("a","b...
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