Problems with \arrayrulecolor on beamer

Question

I am trying to write a certain table on beamer, but there is a problem with the command \arrayrulecolor I cannot understand...

Here is the table in an article document class, how I want it to look like. (Some may object to my choice to use horizontal and vertical rules: but this is just a working example of the problem, my real table is hundreds of rows long, with at least a dozen columns and many, many multicolumns and multirows, and I think, and some people I discussed the table with agree, that the rules help a little bit.)

The code is as follows.

\documentclass[9pt,dvipsnames,table]{article}
 \usepackage{xcolor}
\usepackage[utf8]{inputenc}
\linespread{1.5}
\usepackage{graphicx}
%\usetheme{Frankfurt}
\usepackage{amsbsy}         
\usepackage{amscd}          
\usepackage{amsfonts}
\usepackage{amsmath}        
\usepackage{amssymb}        
\usepackage{amstext}        
\usepackage{amsthm}
\usepackage{multicol}
\usepackage{multirow}       
\usepackage{tikz-cd}
\usepackage{colortbl}
\usepackage{hhline}
\begin{document}
%\begin{frame}{Title}
    \begin{table}[h]
    \centering
    \begin{tabular}{|c|c|c|}
    \hline
    Y & \cellcolor{red!15}  & Y \\hhline{-{1}{>{\arrayrulecolor{red!15}}|-}{1}{>{\arrayrulecolor{black}}|-}}
   Y & \multirow{-2}{*}{\cellcolor{red!15}N}  & Y\\hline
    \end{tabular}
    \end{table}
%\end{frame}
\end{document}

But, when I try to use exactly the same code on beamer, I get the following: notice the white line in the middle column, and the absence of a black line in the last.

The code is essentially the same, but I still post it below.

\documentclass[9pt,dvipsnames,table]{beamer}
\usepackage{xcolor}
\usepackage[utf8]{inputenc}
\linespread{1.5}
\usepackage{graphicx}
\usetheme{Frankfurt}
\usepackage{amsbsy}

\usepackage{amscd}

\usepackage{amsfonts}
\usepackage{amsmath}

\usepackage{amssymb}

\usepackage{amstext}

\usepackage{amsthm}
\usepackage{multicol}
\usepackage{multirow}

\usepackage{tikz-cd}
\usepackage{colortbl}
\usepackage{hhline}
\begin{document}
\begin{frame}{Title}
    \begin{table}[h]
    \centering
    \begin{tabular}{|c|c|c|}
    \hline
    Y & \cellcolor{red!15}  & Y \\hhline{-{1}{>{\arrayrulecolor{red!15}}|-}{1}{>{\arrayrulecolor{black}}|-}}
   Y & \multirow{-2}{*}{\cellcolor{red!15}N}  & Y\\hline
    \end{tabular}
    \end{table}
\end{frame}
\end{document}

Honestly, I have no idea of what is the problem: I tried searching online for some known bug in the interplay between beamer and \arrayrulecolor, but nothing. I tried switching the order of the packages too, to no avail... I also removed every package I could, the ones above being the absolutely necessary for my document to work, but that did not help me either.

Have a look at the tabularray package. This allows you to merge and colour cells without these problems. — samcarter_is_at_topanswers.xyz, Apr 17 '23 at 12:01
@F.Pantigny I looked at it, but it deals mainly with \cline, which actually seems to work for me; my problem is really with \hhline and \arrayrulecolor. — AnyDisplayName, Apr 17 '23 at 12:35

score 2 · Accepted Answer · answered Apr 18 '23 at 17:33

As explained by David Carlisle in this question, the origin of the problem is an \unskip added by Beamer in the definition of the LaTeX command \reset@color.

If you want, here is a patch with a modification of \HH@loop. That command is a command of \hhline but it is redefined by \colortbl. That's why I do a modification of that redefinition. I have only added a \kern\z@ that will be gobbled by the \unskip.

\documentclass[9pt,dvipsnames,table]{beamer}
 \usepackage{xcolor}
\usepackage[utf8]{inputenc}
\linespread{1.5}
\usepackage{graphicx}
%\usetheme{Frankfurt}
\usepackage{amsbsy}         
\usepackage{amscd}          
\usepackage{amsfonts}
\usepackage{amsmath}        
\usepackage{amssymb}        
\usepackage{amstext}        
\usepackage{amsthm}
\usepackage{multicol}
\usepackage{multirow}       
\usepackage{tikz-cd}
\usepackage{colortbl}
\usepackage{hhline}
\begin{document}
\makeatletter
\def\HH@loop{%
  \ifx@tempb`\def\next##1{\the\toks@\cr}\else\let\next\HH@let
  \ifx@tempb|\if@tempswa
          \ifx\CT@drsc@\relax
           \HH@add{\hskip\doublerulesep}%
          \else
           \HH@add{{\CT@drsc@\vrule@width\doublerulesep}}%
           \fi
          \fi@tempswatrue
          \HH@add{{\CT@arc@\vline}}\else
  \ifx@tempb:\if@tempswa
          \ifx\CT@drsc@\relax
           \HH@add{\hskip\doublerulesep}%
          \else
           \HH@add{{\CT@drsc@\vrule@width\doublerulesep}}%
           \fi
              \fi@tempswatrue
      \HH@add{@tempc\HH@box\arrayrulewidth\arrayrulewidth@tempc}\else
  \ifx@tempb##\if@tempswa\HH@add{\hskip\doublerulesep}\fi@tempswatrue
         \HH@add{{\CT@arc@\vline\copy@ne@tempc\vline}}\else
  \ifx@tempb~@tempswafalse
           \if@firstamp@firstampfalse\else\HH@add{&\omit}\fi
              \ifx\CT@drsc@\relax
                \HH@add{\hfil}\else
                 \HH@add{{%
                   \CT@drsc@\leaders\hrule@height\HH@height\hfil}}%
               \fi
                 \else
  \ifx@tempb-@tempswafalse
           \gdef\HH@height{\arrayrulewidth}%
           \if@firstamp@firstampfalse\else\HH@add{&\omit}\fi
              \HH@add{{%
                \CT@arc@\leaders\hrule@height\arrayrulewidth\hfil\kern\z@}}% \kern\z@ added
                           \else
  \ifx@tempb=@tempswafalse
       \gdef\HH@height{\dimen\thr@@}%
       \if@firstamp@firstampfalse\else\HH@add{&\omit}\fi
       \HH@add
          {\rlap{\copy@ne}\leaders\copy@ne\hfil\llap{\copy@ne}}\else
  \ifx@tempb t\HH@add{%
    \def\HH@height{\dimen\thr@@}%
    \HH@box\doublerulesep\z@}@tempswafalse\else
  \ifx@tempb b\HH@add{%
    \def\HH@height{\dimen\thr@@}%
    \HH@box\z@\doublerulesep}@tempswafalse\else
  \ifx@tempb>\def\next##1##2{%
     \HH@add{%
      {\baselineskip\p@\relax
       ##2%
      \global\setbox@ne\HH@box\doublerulesep\doublerulesep}}%
       \HH@let!}\else
  \ifx@tempb@sptoken\let\next\HH@spacelet\else
  \PackageWarning{hhline}%
      {\meaning@tempb\space ignored in \noexpand\hhline argument%
       \MessageBreak}%
  \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi
  \next}
\makeatother
\begin{frame}{Title}
    \begin{table}[h]
    \centering
    \begin{tabular}{|c|c|c|}
    \hline
    Y & \cellcolor{red!15}  & Y \\hhline{-{1}{>{\arrayrulecolor{red!15}}|-}{1}{>{\arrayrulecolor{black}}|-}}
   Y & \multirow{-2}{*}{\cellcolor{red!15}N}  & Y\\hline
    \end{tabular}
    \end{table}
\end{frame}
\end{document}

By the way, I think that there is an error in your instruction \hhline.

You will have a better output with the following code :

\hhline{-|*{1}{>{\arrayrulecolor{red!15}}-}*{1}{>{\arrayrulecolor{black}}|-}}

However, I recommend {NiceTabular} to construct such tables.

\documentclass[9pt,dvipsnames]{beamer}
\usepackage{nicematrix}
\linespread{1.5}
\begin{document}
\begin{frame}{Title}
\begin{center}
\begin{NiceTabular}{ccc}[hvlines]
Y & \Block[fill=red!15]{2-1}{N} & Y \
Y &                             & Y\
\end{NiceTabular}
\end{center}
\end{frame}
\end{document}

As you see, you will have a better output in the PDF viewers.

That works, thank you very much! About the error in my \hhline instruction, you mean I should move | from *{1}{>{\arrayrulecolor{red!15}}|-} to just before that expression? — AnyDisplayName, Apr 19 '23 at 07:13
Yes. The | should be before \arrayrulecolor{red!15} in order to have a small square black instead of red. — F. Pantigny, Apr 19 '23 at 09:19

Zarko · Answer 2 · 2023-04-17T12:51:59.890

1

Welcome to TeX.SE! As suggested @samcarter_is_at_topanswers.xyz, use of the tabularray package can be solution:

\documentclass[9pt,dvipsnames,table]{beamer}
\usetheme{Frankfurt}
\usepackage{tabularray}
\begin{document}
\begin{frame}{Title}
    \begin{table}[h]
    \centering
\begin{tblr}{hlines, vlines,
             colspec = {c Q[c] c}
             }
Y   &   \SetCell[r=2]{c,bg=red!15}    N
        &   Y   \
Y   &   &   Y   \
Z   & Z &   Z   \
\end{tblr}
    \end{table}
\end{frame}

The same result you will get at use of the article document class.

Note: be aware, that beamer load some packages as are xcolor, graphicx, amsmath etc.

edited Apr 17 '23 at 12:51

answered Apr 17 '23 at 12:10

Zarko

296,517

Thanks! Unfortunately my real table is extremely long, and rewriting it using tabularray would be very time consuming... I will wait a little longer for a solution using \arrayrulecolor, but will keep your answer in mind. – AnyDisplayName Apr 17 '23 at 12:30
@AnyDisplayName, changing from classic table to tabularray table is simple. Benefits are evident and worth for this effort (actually you only need to define table preambles and clean-up your table codes)., rewriting rules colors is quite demanding task ... but all is up to you – Zarko Apr 17 '23 at 12:48

Problems with \arrayrulecolor on beamer

2 Answers2