10

How can I change the width of a line in a table produced by \toprule to a default of 0.25em?

I know it would be something along the lines of \renewcommand{\toprule}{??} but what would be in the parameter braces?

Or is it easier to simply use \toprule[0.25ex] per table?

12

I assume that if you want to change the width of \toprule, you also want to change the width of \bottomrule. If that's the case, just issue the instruction

\setlength\heavyrulewidth{0.25ex}

in the preamble after booktabs is loaded.

  • Thanks. Can the same be done for \midrule? – Mr Morgan Jan 11 '15 at 22:21
  • 2
    @MrMorgan Yes, in this case change \lightrulewidth – karlkoeller Jan 11 '15 at 22:22
  • 2
    @MrMorgan - Sure. The parameter is called \lightrulewidth. For \cmidrules, the parameter is called, drumroll, \cmidrulewidth... – Mico Jan 11 '15 at 22:22
  • Note to future self: \cmidrule[thickness](shortening){colstart-colend} so a "local" change can be made with the first square-bracketed option. – PatrickT Mar 5 '18 at 7:26
7

You should look at the definition of \toprule inside booktabs.sty:

\def\toprule{\noalign{\ifnum0=`}\fi
  \@aboverulesep=\abovetopsep
  \global\@belowrulesep=\belowrulesep %global cos for use in the next noalign
  \global\@thisruleclass=\@ne
  \@ifnextchar[{\@BTrule}{\@BTrule[\heavyrulewidth]}}

After setting some predefined macro, \toprule uses \@BTrule[\heavyrulewidth] if you don't specify an optional argument. As such, you can redefine the \heavyrulewidth length (default is .08em; which will also affect \bottomrule and perhaps other rules). Better yet, make a new \toprulewidth and replace it inside \toprule using a patch:

enter image description here

\documentclass{article}
\usepackage{booktabs,etoolbox}

\newlength{\toprulewidth}
\setlength{\toprulewidth}{0.25ex}
\patchcmd{\toprule}% <cmd>
  {\heavyrulewidth}{\toprulewidth}% <search><replace>
  {}{}% <success><failure>

\begin{document}

\begin{tabular}{ccc}
  \toprule
  A & B & C \\
  \midrule
  1 & 2 & 3 \\
  \bottomrule
\end{tabular}
\end{document}

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