连接图标题中的字符串和表达式 [英] Concatenate strings and expressions in a plot's title

问题描述

如何在情节标题中组合文本和数学表达式.如果我使用粘贴，则表达式将转换为字符.例如我想要这样的标题

How can I combine text and math expressions in a plot's title. If I use paste the expression is converted to character. For example I want something like this as a title

$S^2$ 的 $ARL_1$ 曲线

$ARL_1$ curve for $S^2$

谢谢

推荐答案

您想阅读 ?plotmath 以了解如何执行此类操作.下面是一个例子:

You want to read ?plotmath to see how to do this sort of thing. Here is an example:

plot(1:10, main = expression(ARL[1] ~ "curve for" ~ S^2))

[.] 是下标，而 ^ 是上标.~ 将表达式的各个部分隔开，就像有文字空格一样.

The [.] is subscript, whilst ^ gives superscript. The ~ spaces out the parts of the expression as if there were literal spaces.

编辑:通常我会这样做:

plot(1:10, main = expression(ARL[1] ~ curve ~ for ~ S^2))

但这会引发错误，因为 for 被解释为 for() 循环调用的开始.

but that throws an error because for is being interpreted as the start of a for() loop call.

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