问题描述
我正在为函数填充Rd文件.
I'm working on filling in an Rd file for a function.
当我在详细信息"部分中使用\ eqn {2 ^ {x}}，然后构建并安装该软件包时，没有上标指数.
When I use \eqn{2^{x}} in the Details section, then build and install the package, there is no superscripted exponent.
查看R-exts.pdf，它以Poisson.Rd为例，说明如何使用\ eqn或\ deqn.在该文件的示例中，有一个上标指数.
Looking at R-exts.pdf, it points to Poisson.Rd as an example on how to use \eqn or \deqn. In the example in that file, there is a superscripted exponent.
当我查看Poisson(?Poisson )的帮助文件时，没有上标指数.
When I look at the help file for Poisson (?Poisson), There are no superscripted exponents.
这是我的计算机上的问题还是此标准行为?
Is this an issue on my computer or is this standard behavior?
谢谢！
> sessionInfo()
R version 2.11.1 (2010-05-31)
i386-apple-darwin9.8.0
locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices datasets utils methods base
other attached packages:
[1] cimis_0.1-3 RLastFM_0.1-4 RCurl_1.4-2 bitops_1.0-4.1 XML_3.1-0 lattice_0.18-8
loaded via a namespace (and not attached):
[1] grid_2.11.1 tools_2.11.1
推荐答案
您没有说出要查找的地方是否有上标指数.我认为是基于文本的帮助，而不是手册的PDF版本?
You don't say where you looked to see if there was a superscripted exponent. I presume the text based help, not the PDF version of the manual?
\ eqn 宏的语法为 \ eqn {latex} {ascii} . {ascii} 位是可选的，在这种情况下，R将最好渲染LaTeX版本.按照惯例，ASCII下标会用[]括起来，并用^代替.
The syntax for the \eqn macro is \eqn{latex}{ascii}. The {ascii} bit is optional, in which case R will do it's best to render the LaTeX version. Conventionally, subscripts in ASCII would be wrapped in [] and superscipts with ^.
所以我会写:
\eqn{2^{x}}{2^x}
但是在所有实际意义上，这些都是相同的.问题仅在于文本帮助无法显示替换文字，而PDF却可以.
But in all practical senses these are the same. The issue is just that the text help can't display superscipts, but the PDF can.
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