摘要:官方帮助文档如下写的:Usagerep(x, ...)rep.int(x, times)rep_len(x, length.out)Argumentsxa vector (of any mode including a list) or a factor or (forreponly) aPOSIXctorPOSIXltorDateobject; or an S4 object containing such an object....further arguments to be passed to or from other methods. For the internal defaul
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