我在下面的程序中有两个表。第一个表生成\midrule->\noalign等错误，但第二个表不会。我想知道为什么，我希望第一个表的输出与第二个表一样。请帮忙，我已经搜索过了，但无法解决。
\documentclass[12pt, a4paper]{book}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[utf8x]{inputenc}
\usepackage{lmodern}
\usepackage{xtab}
\usepackage{ctable}
\usepackage{booktabs}
\usepackage{array}
\begin{document}
%
\newcommand{\otoprule}{\toprule}
\newcolumntype{M}{>{$}c<{$}} %
%
\begin{table}[tp]
\caption{VANET Infotainment Applications Requirements}
\label{tab:ch-3-infotainapp-req}
\centering
\begin{tabularx}{\columnwidth}{@{}>{\bfseries}Xp{3cm}p{2cm}MM}
\toprule
\textbf{Applications} & \textbf{Comm. Mode} & \textbf{Tx Mode} & \textbf{Critical} & \textbf{Tx} \\
& & & \textbf{Latency} & \textbf{Range} \\
& & & (ms) & (m) \\ \otoprule
Point Of Interest & Broadcast & Periodic & < 1000 & 400+ \\ \midrule
Electronic Commerce & FullDuplex & Periodic & < 500 & 500+ \\ \midrule
Media Streaming & Internet Access & Unicast & < 500 & 500+ \\ \midrule
Insurance Financial Services & Internet Access & Unicast & < 500 & 500+ \\ \midrule
Fleet Management & Internet Access & Unicast & < 500 & 500+ \\ \bottomrule
\end{tabularx}
\end{table}
%
%
\begin{table}[tp] %
\caption{VANET High Priority Applications Requirements}
\label{tab:ch-3-high-priorapp-req}
\centering
\begin{tabularx}{\columnwidth}{@{}>{\bfseries}Xp{2cm}p{2cm}MM}
\toprule
\textbf{Applications} & \textbf{Comm.} & \textbf{Tx} & \textbf{Critical} & \textbf{Tx} \\
& \textbf{Type} & \textbf{Frequency} & \textbf{Latency} & \textbf{Range} \\
& & (Hz) & (ms) & (m) \\ \otoprule
Traffic Signal Violation & I2V & 10 & < 100 & < 250 \\ \midrule
Curve Speed Warning & I2V & 1 & < 1000 & < 200 \\ \midrule
Emergency Brake Lights & V2V & 10 & < 100 & < 200 \\ \midrule
Pre-Crash Sensing & V2V & 10 & < 100 & < 200 \\ \midrule
Forward Collision Warning & V2V & 10 & < 100 & < 150 \\ \midrule
Left Turn Assistance & V2V / I2V & 10 & < 100 & < 300 \\ \midrule
Lane Change Warning & V2V & 10 & < 100 & < 150 \\ \midrule
Stop Sign Assistance & V2V / I2V & 10 & < 100 & < 300 \\ \bottomrule
\end{tabularx}
\end{table}
%
\end{document}
这是.log 文件的内容。
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entering extended mode
restricted \write18 enabled.
%&-line parsing enabled.
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! Misplaced \noalign.
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{\ifnum 0=`}\fi \@aboverulesep =\aboverulesep \global \@...
l.35 \end{tabularx}
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! Misplaced \noalign.
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! Misplaced \noalign.
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! Misplaced \noalign.
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! Misplaced \noalign.
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[1] (./chapter2.aux)
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39i,12n,53p,328b,733s stack positions out of 5000i,500n,10000p,200000b,80000s
Output written on chapter2.dvi (1 page, 2784 bytes).
我需要表 1 的输出像表 2 一样，如下图所示。
答案1
我也遇到了同样的问题。对我有帮助的解决方案是在表格中使用\tabularnewline而不是。\\
此示例：
\usepackage{tabularx}
\usepackage{ctable}
...
\begin{tabularx}{1\textwidth}{>{\setlength\hsize{1\hsize}\centering}X}
Some text... \\ \hline
\end{tabularx}
给出错误：
! Misplaced \noalign.
\hline ->\noalign
{\ifnum 0=`}\fi \hrule \@height \arrayrulewidth \futurelet...```
但这个例子运行得很好：
\usepackage{tabularx}
\usepackage{ctable}
...
\begin{tabularx}{1\textwidth}{>{\setlength\hsize{1\hsize}\centering}X}
Some text... \tabularnewline \hline
\end{tabularx}