我想用 \sum 符号对齐 MWE 中描绘的矩阵 - 我觉得它在当前格式下不太“优雅”/可读性...我该如何实现?提前致谢!
\documentclass[11pt,a4paper,twoside,openright]{book}
\usepackage{IEEEtrantools}
\usepackage{mathtools}
\begin{document}
{
\everymath{\displaystyle}
\begin{IEEEeqnarray}{rCl}
\label{inertia}
I &=& \begin{vmatrix*}[l]
I_{xx} & I_{xy} & I_{xz} \\
I_{yx} & I_{yy} & I_{yz} \\
I_{zx} & I_{zy} & I_{zz}
\end{vmatrix*} \nonumber \\ &=& { \begin{vmatrix*}[l]
\sum_{i=1}^{n} m_{i}(y^{2}_{i}+z^{2}_{i}) & -\sum_{i=1}^{n} m_{i}x_{i}y_{i} &-\sum_{i=1}^{n} m_{i}x_{i}z_{i} \\
-\sum_{i=1}^{n} m_{i}x_{i}y_{i} & \sum_{i=1}^{n} m_{i}(x^{2}_{i}+z^{2}_{i}) &-\sum_{i=1}^{n} m_{i}y_{i}z_{i} \\
-\sum_{i=1}^{n} m_{i}x_{i}z_{i} & -\sum_{i=1}^{n} m_{i}y_{i}z_{i} & \sum_{i=1}^{n} m_{i}(x^{2}_{i}+y^{2}_{i})
\end{vmatrix*} } \IEEEeqnarraynumspace
\end{IEEEeqnarray}
}
\end{document}
答案1
您可以使用幻像:
\documentclass[11pt,a4paper,twoside,openright]{book}
\usepackage{IEEEtrantools}
\usepackage{mathtools}
\begin{document}
\begin{IEEEeqnarray}{rCl}
I &=& \begin{vmatrix*}[l]
I_{xx} & I_{xy} & I_{xz} \\[1ex]
I_{yx} & I_{yy} & I_{yz} \\[1ex]
I_{zx} & I_{zy} & I_{zz}
\end{vmatrix*} \nonumber \\
&=& \everymath{\displaystyle}
\begin{vmatrix*}[l]
\hphantom{-}\sum_{i=1}^{n} m_{i}(y^{2}_{i}+z^{2}_{i}) &
-\sum_{i=1}^{n} m_{i}x_{i}y_{i} &
-\sum_{i=1}^{n} m_{i}x_{i}z_{i}
\\[3ex]
-\sum_{i=1}^{n} m_{i}x_{i}y_{i} &
\hphantom{-}\sum_{i=1}^{n} m_{i}(x^{2}_{i}+z^{2}_{i}) &
-\sum_{i=1}^{n} m_{i}y_{i}z_{i}
\\[3ex]
-\sum_{i=1}^{n} m_{i}x_{i}z_{i} &
-\sum_{i=1}^{n} m_{i}y_{i}z_{i} &
\hphantom{-}\sum_{i=1}^{n} m_{i}(x^{2}_{i}+y^{2}_{i})
\end{vmatrix*}
\IEEEeqnarraynumspace
\label{inertia}
\end{IEEEeqnarray}
\end{document}