NiceMatrixBlock 位于方程式内部时的间距问题

Question

我需要使用NiceMatrixBlock 里面一个等式，但这样做会引起间距问题。有办法解决这个问题吗？

梅威瑟：

\documentclass{article} 
\usepackage{mathtools,nicematrix}

\begin{document}

A test equation:
\begin{align}
   e^{i\pi}+1=0
\end{align}

With NiceMatrixBlock outside align:
\begin{NiceMatrixBlock}[auto-columns-width]%
   \begin{align}
      \begin{dcases}
         \begin{NiceArrayWithDelims}{[}{]}{cc}
            a     &b\\
            ccccc &d\\
         \end{NiceArrayWithDelims}
         \\
         \begin{NiceArrayWithDelims}{[}{]}{ccc}
            a  &b &c\\
            d  &e &f\\
         \end{NiceArrayWithDelims}
      \end{dcases}
   \end{align}
\end{NiceMatrixBlock}

With NiceMatrixBlock inside align:
\begin{align}
   \begin{NiceMatrixBlock}[auto-columns-width]%
   \begin{dcases}
      \begin{NiceArrayWithDelims}{[}{]}{cc}
         a     &b\\
         ccccc &d\\
      \end{NiceArrayWithDelims}
      \\
      \begin{NiceArrayWithDelims}{[}{]}{ccc}
         a  &b &c\\
         d  &e &f\\
      \end{NiceArrayWithDelims}
   \end{dcases}
   \end{NiceMatrixBlock}
\end{align}

\end{document}

Answer 1

这是 中的一个错误nicematrix。我在 CTAN 上发布了一个新版本nicematrix(v. 2.23, 2023-09-02)，解决了该问题。

Answer 2

它会因测量过程而感到困惑，nicematrix 维护者通常会忽略它，并且可能会提供更好的答案，但一个简单的解决方法是先在一个盒子里执行 nicematrix 块。

\documentclass{article} 
\usepackage{mathtools,nicematrix}
\newbox\hmmm
\begin{document}

A test equation:
\begin{align}
   e^{i\pi}+1=0
\end{align}



With NiceMatrixBlock outside align:
\begin{NiceMatrixBlock}[auto-columns-width]%
   \begin{align}
      \begin{dcases}
         \begin{NiceArrayWithDelims}{[}{]}{cc}
            a     &b\\
            ccccc &d\\
         \end{NiceArrayWithDelims}
         \\
         \begin{NiceArrayWithDelims}{[}{]}{ccc}
            a  &b &c\\
            d  &e &f\\
         \end{NiceArrayWithDelims}
      \end{dcases}
   \end{align}
\end{NiceMatrixBlock}


With NiceMatrixBlock inside align:
\setbox\hmmm=\hbox{$%
   \begin{NiceMatrixBlock}[auto-columns-width]%
   \begin{dcases}
      \begin{NiceArrayWithDelims}{[}{]}{cc}
         a     &b\\
         ccccc &d\\
      \end{NiceArrayWithDelims}
      \\
      \begin{NiceArrayWithDelims}{[}{]}{ccc}
         a  &b &c\\
         d  &e &f\\
      \end{NiceArrayWithDelims}
   \end{dcases}
   \end{NiceMatrixBlock}$}
\begin{align}
aaa&bbb\\
\usebox\hmmm
&ccc
\end{align}


\begin{align}
   e^{i\pi}+1=0
\end{align}


\end{document}