数组中的方程编号

Question

我想将方程编号放在以下代码的右边：

\[
 \log{y_{i}} = 
\left\{
  \begin{array}{l l}
    y_{2i}^{*} & \quad \textrm{if $y_{2i}^{*}\succ0$}\\
    0 & \quad \textrm{otherwise}
  \end{array} 
    \right.
    \]

任何想法？

Answer 1

请明智使用{}以保持可读性。

\documentclass[preview,border=12pt]{standalone}
\usepackage{amsmath}
\begin{document}
\abovedisplayskip=0pt\relax% don't use this line in your production
\begin{equation}
\log y_i= 
\begin{cases}
    y_{2i}^* & \quad \text{if $y_{2i}^*\succ0$}\\
    0 & \quad \text{otherwise} 
\end{cases}
\end{equation}
\end{document}

Answer 2

加载包amsmath然后替换\[ ... \]为

\begin{flalign}
...
\end{flalign}