• 1. wise operations: 二元位运算符
• 2. Binary bit-wise operations: 二元位运算符

• 1.One thing that can be confusing about R's "everything is a vector" approach is that row-wise and column-wise operations may not adhere to your intuition.
  关于 R 的 “所有东西都是向量” 方式，容易引起混乱的一点是行操作和列操作可能不符合直觉。
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