表达式中的上标和下标相同的字符
问题描述：
在情节中，我想要一个标题，该标题应具有:
In a plot I would like a title which should have:
字符串我的标题是"，后跟由'引起的caharecter alpha(即alpha素数)，alpha也带有下标G.
the string "my title is" followed by the caharecter alpha raised by ' (i.e. alpha prime) with alpha also having the subscript G.
我尝试过:
expression(paste("my title is ",alpha^{"'"}[G],")"))
，但是上面的代码将alpha提升为幂'G.如何在'上标而不在G下标?
but the above code raises alpha to the power 'G . How do I superscript the ' but subscript the G ?
答
以下任一方法都能解决问题:
Either of the following would do the trick:
alpha[G]^"'"
{alpha^{"'"}}[G]
它们的排版略有不同，因此请选择您喜欢的任何一个.
They are typeset slightly differently, so pick whichever you prefer.