这张表有几个问题。
我使用
\centering命令将表格的第一行居中对齐，但它不起作用，所有内容都左对齐表格右上角的边框缺少一些部分
有没有办法最大限度地减少行之间的空白？
代码：
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[a4paper, total={6in, 8in}]{geometry}
\usepackage{algorithm}
\usepackage{algpseudocode}
\usepackage{amsmath,amssymb}
\usepackage{amsthm}
\usepackage{mathrsfs}
\usepackage{cleveref}
\usepackage{tikz}
\usetikzlibrary{positioning,calc,arrows.meta}%arrows is deprecated
\usepackage{float}
\usepackage{framed}
\usepackage{blindtext}
\newfloat{infobox}{htbp}{lop}
\theoremstyle{definition}
\newtheorem{definition}{Definition}[section]
\pagenumbering{gobble}
\begin{document}
\begin{center}
\begin{table}
\centering
\begin{tabular}{|p{0.4\linewidth} | p{0.5\linewidth}|}
\hline
Visit Type & Fixed-Point Loop? \\ \\
\hline\hline
Circular visit inside of circular visit & No fixed-point loop. Since the parent visit repeats the evaluation, its loop includes the child visit as well.\\ \hline
Non-circular visit in circular visit & No fixed-point loop. Visit has to evaluate only once. \\ \hline
Non-circular visit in non-circular visit & No fixed-point loop. Visit has to evaluate only once. \\ \hline
Circular visit in non-circular visit & Needs fixed-point loop. \\ \hline
\end{tabular}\caption{case-by-case analysis of loop requirement in CRAG visit sequence evaluator}
\end{table}
\end{center}
\end{document}
答案1
- 对于您的下一个问题：您的代码包含许多不必要的包。
- 您两次将（完整的！）表格居中（使用
\begin{center}和\centering）。此\centering版本更好，因为它没有添加额外的垂直空白，请参阅何时应使用 \begin{center} 而不是 \centering？。 - 关于第一个问题（将单元格内容居中），我提供了一个基于在表格环境中对齐特定单元格。
- 对于另一个问题（单词间距），我建议看看表格中 p{length} 框的右对齐或者如何使表格中的段落单元格左对齐？（我现在必须停止拖延并开始做我的实际工作：））。
\documentclass{article}
%\usepackage[utf8]{inputenc}
\begin{document}
\begin{table}
\centering
\begin{tabular}{|p{0.4\linewidth} | p{0.5\linewidth}|}
\hline
% https://tex.stackexchange.com/questions/33486
\multicolumn{1}{|c|}{Visit Type} & \multicolumn{1}{c|}{Fixed-Point Loop?} \\
\hline\hline
Circular visit inside of circular visit & No fixed-point loop. Since the parent visit repeats the evaluation, its loop includes the child visit as well.\\ \hline
Non-circular visit in circular visit & No fixed-point loop. Visit has to evaluate only once. \\ \hline
Non-circular visit in non-circular visit & No fixed-point loop. Visit has to evaluate only once. \\ \hline
Circular visit in non-circular visit & Needs fixed-point loop. \\ \hline
\end{tabular}\caption{case-by-case analysis of loop requirement in CRAG visit sequence evaluator}
\end{table}
\end{document}
答案2
您可以\centering在第一行的单元格中使用，但需要注意的是，\tabularnewline以便结束它。
不要封闭table在里面center：你只能在某处获得垂直空间，不一定在桌子周围。
我还添加了表格的不同渲染，没有垂直规则并且重复较少。
\documentclass{article}
\usepackage[a4paper, total={6in, 8in}]{geometry}
\usepackage{booktabs} % for the second rendering
\begin{document}
\begin{table}[htp]
\centering
\begin{tabular}{|p{0.4\linewidth} | p{0.5\linewidth}|}
\hline
\centering Visit Type & \centering Fixed-Point Loop? \tabularnewline
\hline\hline
Circular visit inside of circular visit &
No fixed-point loop. Since the parent visit repeats the evaluation,
its loop includes the child visit as well. \\
\hline
Non-circular visit in circular visit &
No fixed-point loop. Visit has to evaluate only once. \\
\hline
Non-circular visit in non-circular visit &
No fixed-point loop. Visit has to evaluate only once. \\
\hline
Circular visit in non-circular visit &
Needs fixed-point loop. \\
\hline
\end{tabular}
\caption{Case-by-case analysis of loop requirement in CRAG visit sequence evaluator}
\end{table}
\begin{table}[htp]
\centering
\begin{tabular}{@{} l p{0.6\linewidth} @{}}
\toprule
Visit Type & \centering Fixed-Point Loop? \tabularnewline
\midrule
Circular in circular &
No fixed-point loop. Since the parent visit repeats the evaluation,
its loop includes the child visit as well. \\
\addlinespace
Non-circular in circular &
No fixed-point loop. Visit has to evaluate only once. \\
\addlinespace
Non-circular in non-circular &
No fixed-point loop. Visit has to evaluate only once. \\
\addlinespace
Circular in non-circular &
Needs fixed-point loop. \\
\bottomrule
\end{tabular}
\caption{Case-by-case analysis of loop requirement in CRAG visit sequence evaluator}
\end{table}
\end{document}
答案3
您可以尝试使用tabularray包。使用它来定义第一行（包含列标题）和线条样式很简单。以下是两个示例/与@egreg 答案 (+1) 中的示例类似/：
\documentclass{article}
\usepackage[a4paper, total={6in, 8in}]{geometry}
\usepackage{tabularray}
\begin{document}
\begin{table}[htp]
\centering
\begin{tblr}{hline{1,Z}=1pt, hline{2}=0.6pt, hline{3-Y}={solid},
vlines,
colspec={Q[j,t, wd=0.4\linewidth] Q[j,t, wd=0.5\linewidth]},
row{1} = {font=\bfseries, c}% content of cells in the first row
% are horizontal centered
}
Visit Type & Fixed-Point Loop? \\
Circular visit inside of circular visit
& No fixed-point loop. Since the parent visit repeats the evaluation,
its loop includes the child visit as well. \\
Non-circular visit in circular visit
& No fixed-point loop. Visit has to evaluate only once. \\
Non-circular visit in non-circular visit
& No fixed-point loop. Visit has to evaluate only once. \\
Circular visit in non-circular visit
& Needs fixed-point loop. \\
\end{tblr}
\caption{Case-by-case analysis of loop requirement in CRAG visit sequence evaluator}
\label{tab:?}
\end{table}
\begin{table}[htp]
\centering
\begin{tblr}{hline{1,Z}=1pt, hline{2}=0.6pt,
colspec={@{} Q[j,t, wd=0.4\linewidth] Q[j,t, wd=0.5\linewidth] @{}},
row{1} = {font=\bfseries, c},
row{2-Y} = {belowsep+=3pt}
}
Visit Type & Fixed-Point Loop? \\
Circular visit inside of circular visit
& No fixed-point loop. Since the parent visit repeats the evaluation,
its loop includes the child visit as well. \\
Non-circular visit in circular visit
& No fixed-point loop. Visit has to evaluate only once. \\
Non-circular visit in non-circular visit
& No fixed-point loop. Visit has to evaluate only once. \\
Circular visit in non-circular visit
& Needs fixed-point loop. \\
\end{tblr}
\caption{Case-by-case analysis of loop requirement in CRAG visit sequence evaluator}
\label{tab:??}
\end{table}
\end{document}
顺便说一句，表格的标题通常位于表格上方。