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使用矩阵环境时上传到 Moodle 时出错

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使用矩阵环境时上传到 Moodle 时出错

我第一次尝试将测验上传到 Moodle，并使用包 {Moodle} 生成文件。问题是上传的文件无法识别矩阵环境，并显示代码而不是矩阵形式。有解决方案吗？

\documentclass[12pt]{article}
\usepackage{amsmath,amsthm, amssymb, latexsym}
\makeatletter
\renewcommand*\env@matrix[1][c]{\hskip -\arraycolsep
\let\@ifnextchar\new@ifnextchar
\array{*\c@MaxMatrixCols #1}}
\makeatother 
\usepackage{moodle}
   \begin{document}
   \begin{quiz}{Revisiting Linear Algebra}
     \begin{multi}[points=2]{Matrix Form of a Linear System}
       Consider the following system
              \begin{center}
       $
\begin{matrix}[r]
3.0 x_1    &+2.0 x_2     &+2.0  x_3      & -5.0 x_4 & =8 .0   \\
0.6 x_1   &+ 1.5 x_2     &+1.5 x_3       & -5.4 x_4 & =2.7 \\  
1.2 x_1   & -0.3 x_2      & -0.3 x_3      & 2.4 x_4   &  =2.1 , \\  
\end{matrix}
$
   \end{center}


which may be written as a single vector equation; i.e, $\mathbf{AB}=\mathbf{B}$.\\
     The $\mathbf{A}$ matrix associated with the  system is:
\item*
 $
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0   \\
0.6    &+ 1.5      &+1.5        & -5.4   \\  
1.2    & -0.3      & -0.3      & 2.4 , \\  
\end{bmatrix}
$
\item $
\begin{bmatrix}[r]
8 .0   \\
2.7 \\  
2.1  \\  
\end{bmatrix}
$  
  \item $
\begin{bmatrix}[r]
x_1 &\\
x_2& \\  
x_3 &\\  
x_4 &\\
\end{bmatrix}
$       
\item  
$
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0 &  8.0 \\
0.6    &+ 1.5     &+1.5       & -5.4  & 2.7 \\  
1.2    & -0.3      & -0.3       & 2.4 , & 2.1\\  
\end{bmatrix}
$       
\end{multi}

     \begin{multi}[points=2]{Matrix Form of a Linear System}
     Consider the following system
              \begin{center}
       $
\begin{matrix}[r]
3.0 x_1    &+2.0 x_2     &+2.0  x_3      & -5.0 x_4 & =8 .0   \\
0.6 x_1   &+ 1.5 x_2     &+1.5 x_3       & -5.4 x_4 & =2.7 \\  
1.2 x_1   & -0.3 x_2      & -0.3 x_3      & 2.4 x_4   &  =2.1 , \\  
\end{matrix}
$
   \end{center}


which may be written as a single vector equation; i.e, $\mathbf{AB}=\mathbf{B}$.\\
       The $\mathbf{B}$ matrix associated with the  system is:
\item*
       $
\begin{bmatrix}[r]
8 .0   \\
2.7 \\  
2.1  \\  
\end{bmatrix}
$  
\item[fraction=0] 
 $
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0   \\
0.6    &+ 1.5      &+1.5        & -5.4   \\  
1.2    & -0.3      & -0.3      & 2.4 , \\  
\end{bmatrix}
$
  \item[fraction=0]   
 $
\begin{bmatrix}[r]
x_1 &\\
x_2& \\  
x_3 &\\  
x_4 &\\
\end{bmatrix}
$       
\item[fraction=0]   
 $
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0 &  8.0 \\
0.6    &+ 1.5     &+1.5       & -5.4  & 2.7 \\  
1.2    & -0.3      & -0.3       & 2.4 , & 2.1\\  
\end{bmatrix}
$       
     \end{multi}     

 \end{quiz}
\end{document}

答案1

这手动的for moodle.sty(第 10 页) 提到，只有四种环境会被识别并转换为 html：、center和enumerate。因此itemize，tikzpicture所有其他环境（例如matrix）都无法使用。引用（重点是我的）：

请注意，moodle.sty 不知道如何将任何其他 TEX 或 LATEX 命令转换为 HTML。如果使用其他序列，它们可能 逐字通过XML 文件或可能会导致不可预测的结果。

但是，tikzpicture您可以在 中使用 LaTeX 代码node，这样您就可以使用环境matrix。矩阵将由 Moodle 转换为图像，并以 base64 编码存储在文件中.xml，类似于包含.png文件。

请注意，要使其工作，您可能需要\tikzexternalize在测验源代码中明确调用。也是shell-escape必需的（与图像相同）。

梅威瑟：

\documentclass[12pt]{article}
\usepackage{amsmath,amsthm, amssymb, latexsym}
\usepackage{tikz}
\makeatletter
\renewcommand*\env@matrix[1][c]{\hskip -\arraycolsep
\let\@ifnextchar\new@ifnextchar
\array{*\c@MaxMatrixCols #1}}
\makeatother 
\usepackage{moodle}
\usetikzlibrary{external} % set this 
\tikzexternalize          % explicitly

\begin{document}
\begin{quiz}{Revisiting Linear Algebra}
\begin{multi}[points=2]{Matrix Form of a Linear System}
Consider the following system
       
\begin{tikzpicture} % matrix inside of tikzpicture node
\node{
$\begin{matrix}[r]
3.0 x_1    &+2.0 x_2     &+2.0  x_3      & -5.0 x_4 & =8 .0   \\
0.6 x_1   &+ 1.5 x_2     &+1.5 x_3       & -5.4 x_4 & =2.7 \\  
1.2 x_1   & -0.3 x_2      & -0.3 x_3      & 2.4 x_4   &  =2.1 , \\  
\end{matrix}
$};
\end{tikzpicture}

which may be written as a single vector equation; i.e, $\mathbf{AB}=\mathbf{B}$.\\
The $\mathbf{A}$ matrix associated with the system is:
\item*
\begin{tikzpicture}
\node{ $
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0   \\
0.6    &+ 1.5      &+1.5        & -5.4   \\  
1.2    & -0.3      & -0.3      & 2.4 , \\  
\end{bmatrix}
$};\end{tikzpicture}
\item\begin{tikzpicture}
\node{ $
\begin{bmatrix}[r]
8 .0   \\
2.7 \\  
2.1  \\  
\end{bmatrix}
$};\end{tikzpicture}  
  \item \begin{tikzpicture}
\node{$
\begin{bmatrix}[r]
x_1 &\\
x_2& \\  
x_3 &\\  
x_4 &\\
\end{bmatrix}
$};\end{tikzpicture}       
\item  
\begin{tikzpicture}
\node{$
\begin{bmatrix}[r]
3.0    &+2.0      &+2.0        & -5.0 &  8.0 \\
0.6    &+ 1.5     &+1.5       & -5.4  & 2.7 \\  
1.2    & -0.3      & -0.3       & 2.4 , & 2.1\\  
\end{bmatrix}
$};\end{tikzpicture}       
\end{multi}
 \end{quiz}
\end{document}

生成的 xml 的一部分：

<questiontext format="html">
    <text><![CDATA[<p>Consider the following system </P>
<P><IMG SRC="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAc4AAACOCAYAAAC4 etc.

答案2

最佳实践解决方案似乎是用 Moodle 提出的解决方案来matrix替代array手动的， 如下：

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{moodle}
   \begin{document}
   \begin{quiz}{Revisiting Linear Algebra}
    
     \begin{multi}[points=2]{Matrix Form of a Linear System}
       Consider the following system
       \[
        \left[
\begin{array}{ccccc}
3.0 x_1    &+2.0 x_2     &+2.0  x_3      & -5.0 x_4 & =8.0\\
0.6 x_1   &+ 1.5 x_2     &+1.5 x_3       & -5.4 x_4 & =2.7\\  
1.2 x_1   & -0.3 x_2      & -0.3 x_3      & 2.4 x_4   &  =2.1 , \\  
\end{array}\right]
\]
  
which may be written as a single vector equation; i.e, $\mathbf{AB}=\mathbf{B}$.\\
     The $\mathbf{A}$ matrix associated with the  system is:   
\item* First answer
\[
 \left[
\begin{array}{cccc}
3.0    &+2.0      &+2.0        & -5.0   \\
0.6    &+ 1.5      &+1.5        & -5.4   \\  
1.2    & -0.3      & -0.3      & 2.4 , \\
\end{array}
\right]
\]
\item Second answer
\end{multi}

 \end{quiz}
\end{document}

重要的提示：当前发布的moodle软件包版本 0.5 已过时，并且存在无法处理的错误\\。您必须从下载最新版本这里. 安装指南如下这里。

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