我正在处理一个长表格，我想让表格头部的文本换行。我发现即使我使用\endfirsthead和\endhead，头部的文本也无法换行。但是，如果我只写头部而不使用这两个命令，文本可以换行，但它们不会在每页的开头重复。有没有办法让头部的文本换行，同时头部可以在每页上重复？
这是使用命令制作页眉的代码。它可以在每一页上重复，但文本不能换行：
\documentclass{article}
\usepackage{graphicx} % for management of figures
\usepackage{caption}
\usepackage{subcaption}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{mathrsfs}
\usepackage{hyperref}
\usepackage{parskip}
\usepackage{apacite}
\usepackage{natbib} % for "\citet" and "\citep"
\usepackage{mathtools}
\usepackage[a4paper, total={6in, 9in}]{geometry}
\usepackage{longtable} % for long table
\usepackage{multirow}
\usepackage{wrapfig} % for wrapped text around tables or figures
\begin{document}
\begin{center}
\begin{longtable}{p{1.8cm}|p{1.5cm}|p{1.5cm}|p{1.5cm}|p{1.5cm}|p{1.5cm}}
\caption{Improvements by using DPTP and fixed presets of all benchmark functions} \label{table:result_improvement} \\
\toprule \multicolumn{1}{c|}{\textbf{Benchmark \newline function}} & \multicolumn{1}{c|}{\textbf{Experi. setup}} & \multicolumn{1}{c|}{\textbf{Initial fitness}} & \multicolumn{1}{c|}{\textbf{Final fitness}} & \multicolumn{1}{c|}{\textbf{Improvements}} & \multicolumn{1}{c}{\textbf{Percentage}} \\ \hline
\endfirsthead
\multicolumn{6}{c}
{{\bfseries \tablename\ \thetable{} -- continued from previous page}} \\
\hline \multicolumn{1}{c|}{\textbf{Benchmark \newline function}} & \multicolumn{1}{c|}{\textbf{Experi. setup}} & \multicolumn{1}{c|}{\textbf{Initial fitness}} & \multicolumn{1}{c|}{\textbf{Final fitness}} & \multicolumn{1}{c|}{\textbf{Improvements}} & \multicolumn{1}{c}{\textbf{Percentage}} \\ \hline
\endhead
\hline \multicolumn{6}{r}{{Continued on next page}} \\
\endfoot
\bottomrule
\endlastfoot
\multirow{11}{*}{C23} & DPTP & 26992.13 & 2693.673 & 24298.46 & 90.02\% \\
& Preset 0 & 25789.55 & 2756.774 & 23032.78 & 89.31\% \\
& Preset 1 & 26236.34 & 2676.916 & 23559.42 & 89.80\% \\
& Preset 2 & 27330.98 & 2737.67 & 24593.31 & 89.98\% \\
& Preset 3 & 25465.2 & 2735.844 & 22729.35 & 89.26\% \\
& Preset 4 & 25977.27 & 2678.884 & 23298.38 & 89.69\% \\
& Preset 5 & 25361.18 & 2702.239 & 22658.95 & 89.34\% \\
& Preset 6 & 26466.49 & 2695.999 & 23770.49 & 89.81\% \\
& Preset 7 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 8 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 9 & 27365.9 & 2695.156 & 24670.75 & 90.15\% \\ \hline
\multirow{11}{*}{C23} & DPTP & 26992.13 & 2693.673 & 24298.46 & 90.02\% \\
& Preset 0 & 25789.55 & 2756.774 & 23032.78 & 89.31\% \\
& Preset 1 & 26236.34 & 2676.916 & 23559.42 & 89.80\% \\
& Preset 2 & 27330.98 & 2737.67 & 24593.31 & 89.98\% \\
& Preset 3 & 25465.2 & 2735.844 & 22729.35 & 89.26\% \\
& Preset 4 & 25977.27 & 2678.884 & 23298.38 & 89.69\% \\
& Preset 5 & 25361.18 & 2702.239 & 22658.95 & 89.34\% \\
& Preset 6 & 26466.49 & 2695.999 & 23770.49 & 89.81\% \\
& Preset 7 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 8 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 9 & 27365.9 & 2695.156 & 24670.75 & 90.15\% \\
\end{longtable}
\end{center}
\end{document}
标题不换行：
这是不使用命令的代码，文本可以换行但是头部不会重复：
\documentclass{article}
\usepackage{graphicx} % for management of figures
\usepackage{caption}
\usepackage{subcaption}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{mathrsfs}
\usepackage{hyperref}
\usepackage{parskip}
\usepackage{apacite}
\usepackage{natbib} % for "\citet" and "\citep"
\usepackage{mathtools}
\usepackage[a4paper, total={6in, 9in}]{geometry}
\usepackage{longtable} % for long table
\usepackage{multirow}
\usepackage{wrapfig} % for wrapped text around tables or figures
\begin{document}
\begin{center}
\begin{longtable}{p{1.8cm}|p{1.5cm}|p{1.5cm}|p{1.5cm}|p{1.5cm}|p{1.5cm}}
\caption{Improvements by using DPTP and fixed presets of all benchmark functions}
\label{table:result_improvement} \\
Benchmark function & Experi. setup & Initial fitness & Final fitness & Improvements & Improvement percentage \\ \hline
\multirow{11}{*}{C23} & DPTP & 26992.13 & 2693.673 & 24298.46 & 90.02\% \\
& Preset 0 & 25789.55 & 2756.774 & 23032.78 & 89.31\% \\
& Preset 1 & 26236.34 & 2676.916 & 23559.42 & 89.80\% \\
& Preset 2 & 27330.98 & 2737.67 & 24593.31 & 89.98\% \\
& Preset 3 & 25465.2 & 2735.844 & 22729.35 & 89.26\% \\
& Preset 4 & 25977.27 & 2678.884 & 23298.38 & 89.69\% \\
& Preset 5 & 25361.18 & 2702.239 & 22658.95 & 89.34\% \\
& Preset 6 & 26466.49 & 2695.999 & 23770.49 & 89.81\% \\
& Preset 7 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 8 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 9 & 27365.9 & 2695.156 & 24670.75 & 90.15\% \\ \hline
\multirow{11}{*}{C23} & DPTP & 26992.13 & 2693.673 & 24298.46 & 90.02\% \\
& Preset 0 & 25789.55 & 2756.774 & 23032.78 & 89.31\% \\
& Preset 1 & 26236.34 & 2676.916 & 23559.42 & 89.80\% \\
& Preset 2 & 27330.98 & 2737.67 & 24593.31 & 89.98\% \\
& Preset 3 & 25465.2 & 2735.844 & 22729.35 & 89.26\% \\
& Preset 4 & 25977.27 & 2678.884 & 23298.38 & 89.69\% \\
& Preset 5 & 25361.18 & 2702.239 & 22658.95 & 89.34\% \\
& Preset 6 & 26466.49 & 2695.999 & 23770.49 & 89.81\% \\
& Preset 7 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 8 & 26699.03 & 2767.44 & 23931.59 & 89.63\% \\
& Preset 9 & 27365.9 & 2695.156 & 24670.75 & 90.15\% \\
\end{longtable}
\end{center}
\end{document}
文本可以换行但头部不会重复：
答案1
如果你想保持居中和换行，我建议
\multicolumn{1}{>{\centering}p{2cm}|}{\textbf{Benchmark \newline function}}
（2cm 似乎比 1.8cm 更合适）