R语言横坐标题注公式

在R语言中，可以使用函数`expression()`将公式添加到图表的横坐标标题中。例如，使用`xlab(expression(frac(miles, gallon)))`将在横坐标标题中显示一个分数公式，其中分子是"miles"，分母是"gallon"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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