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具有可變列數的表格（或類似物）中的自動行（不是行）中斷

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具有可變列數的表格（或類似物）中的自動行（不是行）中斷

我有一些值需要以行優先形式放入，即根據表格的寬度填充表格的列，如 MWE 中所述。

\documentclass[a4paper]{article}
\usepackage[margin=2cm]{geometry} % Just for this example
\setlength{\tabcolsep}{0.5cm}
\newcommand\myelement{\rule{1cm}{0.5cm}}
\begin{document}
Suppose each element width is 1 cm.

The whole page is 21 cm - 2*2 cm = 19 cm and therefore can contain
(19 cm / (1 cm + 2*0.5 cm)) = 9.5 = 9 elements, so the output should be like:

\begin{tabular}{rrrrrrrrr}
\myelement & \myelement & \myelement & \myelement & \myelement & \myelement & \myelement & \myelement & \myelement\\
\myelement & \myelement & \myelement & \myelement & \myelement & \myelement & \myelement & \myelement & \myelement\\
\myelement & \myelement & \myelement
\end{tabular}

~\\[1cm]

\begin{minipage}{0.5\linewidth}
Here the output should be like:

\begin{tabular}{rrrr}
\myelement & \myelement & \myelement & \myelement \\
\myelement & \myelement & \myelement & \myelement \\
\myelement & \myelement & \myelement & \myelement \\
\myelement & \myelement & \myelement & \myelement \\
\myelement & \myelement & \myelement & \myelement \\
\myelement
\end{tabular}
\end{minipage}
\end{document}

列數必須根據包含「自動列環境/命令」（根據需要命名）的框的寬度自動推導出來，前提是元素的最大寬度。

任何想法？我可以使用 LuaLaTeX，但這個解決方案太慢並且佔用內存，所以這是最後一個選擇。

答案1

在此輸入影像描述

\documentclass[a4paper]{article}
\usepackage[margin=2cm]{geometry} % Just for this example
\setlength{\tabcolsep}{0.5cm}
\newcommand\myelement{\rule{1cm}{0.5cm}}
\newcommand\xelement{\makebox[2cm]{\myelement}\hspace{0pt}}

\begin{document}
Suppose each element width is 1 cm.

The whole page is 21 cm - 2*2 cm = 19 cm and therefore can contain
(19 cm / (1 cm + 2*0.5 cm)) = 9.5 = 9 elements, so the output should be like:


\begin{flushleft}
\xelement  \xelement  \xelement  \xelement  \xelement  \xelement  \xelement  \xelement  \xelement
\xelement  \xelement  \xelement  \xelement  \xelement  \xelement  \xelement  \xelement  \xelement
\xelement  \xelement  \xelement
\end{flushleft}

\bigskip

\begin{minipage}{0.5\linewidth}
Here the output should be like:

\begin{flushleft}
\xelement  \xelement  \xelement  \xelement 
\xelement  \xelement  \xelement  \xelement 
\xelement  \xelement  \xelement  \xelement 
\xelement  \xelement  \xelement  \xelement 
\xelement  \xelement  \xelement  \xelement 
\xelement
\end{flushleft}
\end{minipage}
\end{document}

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