我只是将问题放在示例 .Rnw 代码块中。当将其编译成 .pdf 文件时，最容易看到问题。我使用 pdfLaTeX 和 knitr 在 RStudio 中编译文件。请注意，代码块也必须在 R 中运行，因为它们可能会执行一些操作，例如告诉 R 绘制将成为文档一部分的图表。
\documentclass{article}
\usepackage{setspace}
\doublespacing
\begin{document}
\section*{Question Part 1.}
I am writing this document inside RStudio, using Sweave. I want everything
in the document to be doublespaced with the exception of R code chunks,
which I want to be singlespaced for the sake of tidiness and saving space.
It is important that the code chunks also run in R, since they may be doing
things like telling R to draw plots which will be part of the document.
\section*{Question Part 2.}
The problem that I seem to be having is that when I put in a command to
begin singlespacing and a command to end single spacing around an R code
chunk, text that is not inside the begin and end singlespacing command, for
some reason, ends up being singlespaced as well, even though as far as I can
tell it should be doublespaced, as can be seen with the text in this very
paragraph (if you've compiled it into a .pdf).
\begin{singlespacing}
<<echo=TRUE>>=
k=3
mse=0.347
d=0.85
alpha=0.05
n=30
pwr.df=data.frame(row.names = 1:n)
pwr.df$n=1:n
@
\end{singlespacing}
Strangely, the problem doesn't occur for text which follows the "end" of the
singlespacing commmand, but text which comes before the 'begin'
singlespacing command is affected, as can be seen here.
\end{document}
答案1
我不确定问题的原因是什么，但如果你将代码放在里面，minipage它就会按你想要的方式工作：
\documentclass{article}
\usepackage{setspace}
\begin{document}
\doublespacing
\section*{Question Part 1.}
I am writing this document inside RStudio, using Sweave. I want everything
in the document to be doublespaced with the exception of R code chunks,
which I want to be singlespaced for the sake of tidiness and saving space.
It is important that the code chunks also run in R, since they may be doing
things like telling R to draw plots which will be part of the document.
\section*{Question Part 2.}
The problem that I seem to be having is that when I put in a command to
begin singlespacing and a command to end single spacing around an R code
chunk, text that is not inside the begin and end singlespacing command, for
some reason, ends up being singlespaced as well, even though as far as I can
tell it should be doublespaced, as can be seen with the text in this very
paragraph (if you've compiled it into a .pdf).
\begin{minipage}{\linewidth}
\singlespacing
<<echo=TRUE>>=
k=3
mse=0.347
d=0.85
alpha=0.05
n=30
pwr.df=data.frame(row.names = 1:n)
pwr.df$n=1:n
@
\end{minipage}
Strangely, the problem doesn't occur for text which follows the "end" of the
singlespacing commmand, but text which comes before the 'begin'
singlespacing command is affected, as can be seen here.
\end{document}
