我有以下数据表：
\begin{table}[h]
\centering
\begin{tabular}{l r l}
\multicolumn{2}{l}{Example} & Value \\
\midrule
32 petabyte & \SI{32}{\peta\byte} & \SI{32E15}{\byte} \\
166 terabecquerel & \SI{166}{\tera\becquerel} & \SI{166E12}{\becquerel} \\
83 gigapascal & \SI{83}{\giga\pascal} & \SI{83E9}{\pascal} \\
3.6 megajoule & \SI{3.6}{\mega\joule} & \SI{3.6E6}{\joule} \\
10 kilowatt & \SI{10}{\kilo\watt} & \SI{10E3}{\watt} \\
\addlinespace
100 milliamp & \SI{100}{\milli\amp} & \SI{100E-3}{\amp} \\
50 microvolt & \SI{50}{\micro\volt} & \SI{50E-6}{\volt} \\
1.02 nanosecond & \SI{1.02}{\nano\second} & \SI{1.02E-9}{\second} \\
62 picometre & \SI{62}{\pico\metre} & \SI{62E-12}{\metre} \\
4.7 femtogram & \SI{4.7}{\femto\gram} & \SI{4.7E-15}{\gram}
\end{tabular}
\caption{Examples of SI prefixes in use.}\label{tbl:prefixesexamples}
\end{table}
我希望第一列与数字和单位之间的空格对齐，第二表与数字和单位符号之间的空格对齐，第三表与 10 之前的乘法符号对齐。这可能吗？我尝试使用和列类型，但这并没有产生所需的结果。似乎至少部分问题是尾数有时包含小数点r@{...}，有时不包含小数点。siunitxS
答案1
例如，可以将三列分成六列：
\documentclass{article}
\usepackage{booktabs}
\usepackage{caption}
\usepackage{siunitx}
\DeclareSIUnit\byte{B}
\DeclareSIUnit\amp{A}
\begin{document}
\begin{table}[h]
\centering
\caption{Examples of SI prefixes in use.}\label{tbl:prefixesexamples}
\begin{tabular}{
r@{ }l r@{ }l r@{$\,\times$}l}
\multicolumn{4}{l}{Example} & \multicolumn{2}{l}{Value} \\
\midrule
32 & petabyte & \num{32} & \si{\peta\byte} & \num{32} & \SI{E15}{\byte} \\
166 & terabecquerel & \num{166} & \si{\tera\becquerel} & \num{166} & \SI{E12}{\becquerel} \\
83 & gigapascal & \num{83} & \si{\giga\pascal} & \num{83} & \SI{E9}{\pascal} \\
3.6 & megajoule & \num{3.6} & \si{\mega\joule} & \num{3.6} & \SI{E6}{\joule} \\
10 & kilowatt & \num{10} & \si{\kilo\watt} & \num{10} & \SI{E3}{\watt} \\
\addlinespace
100 & milliamp & \num{100} & \si{\milli\amp} & \num{100} & \SI{E-3}{\amp} \\
50 & microvolt & \num{50} & \si{\micro\volt} & \num{50} & \SI{E-6}{\volt} \\
1.02 & nanosecond & \num{1.02} & \si{\nano\second} & \num{1.02} & \SI{E-9}{\second} \\
62 & picometre & \num{62} & \si{\pico\metre} & \num{62} & \SI{E-12}{\metre} \\
4.7 & femtogram & \num{4.7} & \si{\femto\gram} & \num{4.7} & \SI{E-15}{\gram}
\end{tabular}
\end{table}
\end{document}
答案2
进行一些拉伸：
\documentclass{article}
\usepackage{siunitx,booktabs}
\DeclareSIUnit{\byte}{b}
\begin{document}
\begin{table}[htp]
\centering
\begin{tabular}{
r
@{ }% a space between the columns
l
r
@{\,}% a thin space between the columns
l
r
@{${}\times{}$}% \times between the columns
l
}
\toprule
\multicolumn{2}{c}{Example} & \multicolumn{4}{c}{Value} \\
\midrule
\num{32} & petabyte & \num{32} & \si{\peta\byte} & \num{32}&\SI[parse-numbers=false]{10^{15}}{\byte} \\
\num{166} & terabecquerel & \num{166} & \si{\tera\becquerel} & \num{166}&\SI[parse-numbers=false]{10^{12}}{\becquerel} \\
\num{83} & gigapascal & \num{83} & \si{\giga\pascal} & \num{83}&\SI[parse-numbers=false]{10^{9}}{\pascal} \\
\num{3.6} & megajoule & \num{3.6} & \si{\mega\joule} & \num{3.6}&\SI[parse-numbers=false]{10^{6}}{\joule} \\
\num{10} & kilowatt & \num{10} & \si{\kilo\watt} & \num{10}&\SI[parse-numbers=false]{10^{3}}{\watt} \\
\addlinespace
\num{100} & milliamp & \num{100} & \si{\milli\ampere} & \num{100}&\SI[parse-numbers=false]{10^{-3}}{\ampere} \\
\num{50} & microvolt & \num{50} & \si{\micro\volt} & \num{50}&\SI[parse-numbers=false]{10^{-6}}{\volt} \\
\num{1.02} & nanosecond & \num{1.02} & \si{\nano\second} & \num{1.02}&\SI[parse-numbers=false]{10^{-9}}{\second} \\
\num{62} & picometre & \num{62} & \si{\pico\metre} & \num{62}&\SI[parse-numbers=false]{10^{-12}}{\metre} \\
\num{4.7} & femtogram & \num{4.7} & \si{\femto\gram} & \num{4.7}&\SI[parse-numbers=false]{10^{-15}}{\gram}\\
\bottomrule
\end{tabular}
\caption{Examples of SI prefixes in use.}\label{tbl:prefixesexamples}
\end{table}
\end{document}
