普罗布索恩和斯韦夫

Question

我刚开始学习 probsoln 包，以便可以创建问题集。我有一个可以运行的基本示例：

\documentclass{article}
\usepackage{probsoln}
\showanswers

\begin{document}
  \ifthenelse{\boolean{showanswers}}{\textbf{Solution Sheet}}{\textbf{Homework problems}}

  \loadallproblems{HW_Descriptive.rnw}

  \useproblem{comparing_rates1}
\end{document}

问题集 HW_Descriptive.rnw 包含

\begin{defproblem}{comparing_rates1}
  If 136,670,000 persons were wage and salary workers and 10,544,000 persons were self-employed, what is the fatal injury rate per 100,000 workers for each group? 
\begin{onlysolution}%
  \begin{solution}
  Wage and salary workers have a fatal injury rate per 100,000 workers of 136670000/100000 =  1366.7
  Self-employed workers have a fatal injury rate per 100,000 workers of  10544000/100000 = 105.44
  \end{solution}
\end{onlysolution}
\end{defproblem}

我希望将 R 代码纳入问题中（有时在问题中，最常见的是在解决方案中）。不幸的是，最直接的方法是

\begin{defproblem}{comparing_rates2}
If 136,670,000 persons were wage and salary workers and 10,544,000 persons were self-employed, what is the fatal injury rate per 100,000 workers for each group? 
\begin{onlysolution}%
    \begin{solution}
    <<>>=
    136670000/100000
    10544000/100000
    @
    \end{solution}
\end{onlysolution}
\end{defproblem}

没有工作，输出看起来像

解决方案：!!??=136670000/100000 10544000/100000 @

有人能指出我一个 Sweave + probsol 的实际示例吗？

Answer 1

这不是问题probsoln。如果您尝试以下操作：

\documentclass{article}

\begin{document}

    <<>>=
    136670000/100000
    10544000/100000
    @
\end{document}

你得到

这只是 LaTeX 使用默认字体的默认行为。

如果您使用以下选项，则可以在问题定义中逐字使用fragile：

\documentclass{article}

\usepackage{probsoln}
\showanswers

\begin{defproblem}{comparing_rates2}[fragile]
If 136,670,000 persons were wage and salary workers and 10,544,000 persons were self-employed, what is the fatal injury rate per 100,000 workers for each group? 
\begin{onlysolution}[fragile]%
    \begin{solution}
\begin{verbatim}
    <<>>=
    136670000/100000
    10544000/100000
    @
\end{verbatim}
    \end{solution}
\end{onlysolution}
\end{defproblem}

\begin{document}

  \ifthenelse{\boolean{showanswers}}{\textbf{Solution Sheet}}{\textbf{Homework problems}}


  \useproblem{comparing_rates2}
\end{document}

得出的结果为：

或者，您可以尝试使用listings包裹。