奇怪的 Miss $ Inserted 错误

Question

对于我的文档中的以下文本片段：

\documentclass[11pt]{report}
\usepackage{quotes}
\usepackage{amsmath}


\say{For vertical axes deployment, $\theta_t$ = $\theta_r$ = 0 and for horizontal axes deployment, $\theta_t$ = \frac{$\pi$}{2} and $\theta_r$ = \frac{$-\pi$}{2} are used, \dots Hence, we conclude\dots, that the pathloss is dramatically higher for vertical axes deployment \dots}\\

\end{document}

我明白了

! Missing $ inserted.
<inserted text>
                $
l.396 ...higher for vertical axes deployment\dots}
                                                  \\

我不知道哪里出了问题。有人能指出问题所在吗？

短暂性脑缺血发作

Answer 1

你使用的$方式不对。应该是这样的：

\documentclass{book}
\begin{document}
  For vertical axes deployment, $\theta_t = \theta_r = 0 $ and for horizontal axes
   deployment, $\theta_t = \frac{\pi}{2}$ and $\theta_r = \frac{-\pi}{2}$ are used,
   $\dots$ Hence, we conclude$\dots$, that the path loss is dramatically 
   higher for vertical axes deployment $\dots$
\end{document}

对于内联分数，最好使用\pi/2（而不是\frac{\pi}{2}）来获得