我得到的输出
我想要的输出是相同的，只是Z_bus矩阵的括号应该拉伸以包含array环境的幻影内容，如下所示
显然，我可以\phantom在其中使用和定义我需要的数组，但是在尝试写入可见内容之后\bar{\mathnormalbold{Z}}_{bus}，内容开始进一步延伸。
我的MWE
\documentclass{book}
% ========== Table packages ==========
\usepackage{tabularx}
% BEGIN_FOLD
\newcommand{\arraystretchdefaultl}{1.3}
\newcommand{\arraystretchdefault}{ \renewcommand{\arraystretch}{\arraystretchdefaultl} }
\arraystretchdefault
% END_FOLD
\usepackage{booktabs}
\usepackage{makecell}
% ========== Equations and math packages ==========
\usepackage{amsmath}
\usepackage{amssymb, amsfonts}
\usepackage{mathtools}
\usepackage[defaultmathsizes, italic, eulergreek, symbolre, symbolmisc]{mathastext}
\begin{document}
\begin{align}
\left[
\begin{array}{c}
\mathnormalbold{V}_{G}
\\
%
\Xhline{0.25mm}
V_{R, \thinspace i}
%
\\
V_{R, \thinspace j}
\end{array}
\right] &=
%
\left[
\begin{array}{c !{\vrule width 0.25mm}c c}
\bar{\mathnormalbold{Z}}_{GG} & \bar{\mathnormalbold{Z}}_{GR_{i}} & \bar{\mathnormalbold{Z}}_{GR_{j}}
\\
\Xhline{0.25mm}
%
\bar{\mathnormalbold{Z}}_{R_{i}G} & \bar{Z}_{RR, \thinspace ii} & \bar{Z}_{RR, \thinspace ij}
%
\\
\bar{\mathnormalbold{Z}}_{R_{j}G} & \bar{Z}_{RR, \thinspace ij} & \bar{Z}_{R, \thinspace jj}
\end{array}
\right]
%
\left[
\begin{array}{c}
\bar{\mathnormalbold{I}}_{G}
\\
\Xhline{0.25mm}
%
\bar{I}_{R, \thinspace i}
\\
%
\bar{I}_{R, \thinspace j}
\end{array}
\right]
\label{eq:op_imp_load_RER_int_op}
\\
\intertext{where}
\bar{\mathnormalbold{Z}}_{bus} &=
\left[
\begin{array}{c !{\vrule width 0.25mm}c c}
\bar{\mathnormalbold{Z}}_{GG} & \bar{\mathnormalbold{Z}}_{GR_{i}} & \bar{\mathnormalbold{Z}}_{GR_{j}}
\\
\Xhline{0.25mm}
%
\bar{\mathnormalbold{Z}}_{R_{i}G} & \bar{Z}_{RR, \thinspace ii} & \bar{Z}_{RR, \thinspace ij}
\\
%
\bar{\mathnormalbold{Z}}_{R_{j}G} & \bar{Z}_{RR, \thinspace ij} & \bar{Z}_{R, \thinspace jj}
\end{array}
\right]
\label{eq:Z_bus_hat_def}
\end{align}
\end{document}
答案1
随意使用更广泛的规则（我不认为你应该这么做）。我删除了mathastext它，结果很痛苦。
\documentclass{book}
\usepackage{amsmath,bm}
\newcommand{\bigarraystretch}{\renewcommand{\arraystretch}{1.3}}
\begin{document}
\begingroup\bigarraystretch
\newcommand{\Zbus}{%
\begin{array}{@{} c | c c @{}}
\bar{\bm{Z}}_{GG} & \bar{\bm{Z}}_{GR_{i}} & \bar{\bm{Z}}_{GR_{j}} \\
\hline
\bar{\bm{Z}}_{R_{i}G} & \bar{Z}_{RR,ii} & \bar{Z}_{RR,ij} \\
\bar{\bm{Z}}_{R_{j}G} & \bar{Z}_{RR,ij} & \bar{Z}_{R,jj}
\end{array}%
}
\begin{align}
\left[\begin{array}{@{}c@{}}
\bm{V}_{G} \\
\hline
V_{R,i} \\
V_{R,j}
\end{array}\right]
&=
\begin{bmatrix}
\vphantom{\Zbus}
\ooalign{\hphantom{$\Zbus$}\cr\hfil$\bar{\bm{Z}}_{\mathrm{bus}}$\hfil\cr}
\end{bmatrix}
\left[\begin{array}{@{} c @{}}
\bar{\bm{I}}_{G} \\
\hline
\bar{I}_{R,i} \\
\bar{I}_{R,j}
\end{array}\right]
\label{eq:op_imp_load_RER_int_op}
\\
\intertext{where}
\bar{\bm{Z}}_{\mathrm{bus}} &= \left[\Zbus\right]
\label{eq:Z_bus_hat_def}
\end{align}
\endgroup
\end{document}
其想法是保存 Zbus 矩阵的内容，并将其用于\ooalign将符号叠加在矩阵占据的水平空间上，并使用其之前的垂直空间来设置括号的大小。
答案2
这是一个带有saveboxes 的解决方案：
\documentclass{book}
% ========== Table packages ==========
\usepackage{tabularx}
% BEGIN_FOLD
\newcommand{\arraystretchdefaultl}{1.3}
\newcommand{\arraystretchdefault}{ \renewcommand{\arraystretch}{\arraystretchdefaultl} }
\arraystretchdefault
% END_FOLD
\usepackage{booktabs}
\usepackage{makecell}
% ========== Equations and math packages ==========
\usepackage{amsmath}
\usepackage{amssymb, amsfonts}
\usepackage{mathtools}
\usepackage[defaultmathsizes, italic, eulergreek, symbolre, symbolmisc]{mathastext}
\newsavebox{\mybox}
\newsavebox{\mysbox}
\begin{document}
\begin{align}
\left[
\begin{array}{c}
\mathnormalbold{V}_{G}
\\
%
\Xhline{0.25mm}
V_{R, \thinspace i}
%
\\
V_{R, \thinspace j}
\end{array}
\right] &=
%
\left[
\savebox{\mybox}{\hbox{\(\begin{array}{c !{\vrule width 0.25mm}c c}
\bar{\mathnormalbold{Z}}_{GG} & \bar{\mathnormalbold{Z}}_{GR_{i}} & \bar{\mathnormalbold{Z}}_{GR_{j}}
\\
\Xhline{0.25mm}
%
\bar{\mathnormalbold{Z}}_{R_{i}G} & \bar{Z}_{RR, \thinspace ii} & \bar{Z}_{RR, \thinspace ij}
%
\\
\bar{\mathnormalbold{Z}}_{R_{j}G} & \bar{Z}_{RR, \thinspace ij} & \bar{Z}_{R, \thinspace jj}
\end{array}\)}}\savebox{\mysbox}{\hbox{\(\bar{Z}_{bus}\)}}
\vphantom{\usebox{\mybox}}\hspace{\dimexpr(\dimexpr\wd\mybox/2)-\dimexpr(\wd\mysbox/2)}\usebox{\mysbox}\hspace{\dimexpr(\dimexpr\wd\mybox/2)-\dimexpr(\wd\mysbox/2)}
\right]
%
\left[
\begin{array}{c}
\bar{\mathnormalbold{I}}_{G}
\\
\Xhline{0.25mm}
%
\bar{I}_{R, \thinspace i}
\\
%
\bar{I}_{R, \thinspace j}
\end{array}
\right]
\label{eq:op_imp_load_RER_int_op}
\\
\intertext{where}
\bar{\mathnormalbold{Z}}_{bus} &=
\left[
\begin{array}{c !{\vrule width 0.25mm}c c}
\bar{\mathnormalbold{Z}}_{GG} & \bar{\mathnormalbold{Z}}_{GR_{i}} & \bar{\mathnormalbold{Z}}_{GR_{j}}
\\
\Xhline{0.25mm}
%
\bar{\mathnormalbold{Z}}_{R_{i}G} & \bar{Z}_{RR, \thinspace ii} & \bar{Z}_{RR, \thinspace ij}
\\
%
\bar{\mathnormalbold{Z}}_{R_{j}G} & \bar{Z}_{RR, \thinspace ij} & \bar{Z}_{R, \thinspace jj}
\end{array}
\right]
\label{eq:Z_bus_hat_def}
\end{align}
\end{document}
当然，将此功能放在里面可能会更好\newcommand。如果您觉得可以，请随时向我询问。
