R 布尔值 / 逻辑值
布尔值（逻辑值）
在编程中，您经常需要知道一个表达式是 **真** 还是 **假**。
您可以在 R 中评估任何表达式，并获得两个答案之一，TRUE 或 FALSE。
当您比较两个值时，表达式会被评估，R 会返回逻辑答案。
您也可以比较两个变量
您也可以在 if 语句中运行条件，您将在 if..else 章节中了解更多。
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