6

I am unable to manually add vertical space between the second and third row. It should be controlled by the second parameter to \MyTable but that parameter seems to be have no effect:

enter image description here

Notes:

  • The \MyTable macro was created specifically for this test case so that I can easily test various settings. This problem occurs even without a macro being used for the table.
  • Using \renewcommand*{\arraystretch}{1.5} just before \begin{tabular} does not help in this case as it also stretches out the bmatrix.

Code:

\documentclass{article}
\usepackage[paperwidth=21cm]{geometry}% To eliminate warning in MWE
\usepackage{amsmath}
\usepackage{booktabs}

\newcommand*{\MyTable}[2]{%
\begin{tabular}[t]{@{}cc@{}}\toprule
    #1 & #2 \
    \cmidrule{1-2}
    $\begin{bmatrix}
        a_{11} & a_{12} &  a_{13} & a_{14} \
    \end{bmatrix}$                              & $1 \times 4$ \[#1]
    % -------------------------------------------
    $\begin{bmatrix}
        a_{11} & a_{12} & a_{13} & a_{14} \
        a_{21} & a_{22} & a_{23} & a_{24} \
        a_{31} & a_{32} & a_{33} & a_{34} \
        a_{41} & a_{42} & a_{43} & a_{44} \
    \end{bmatrix}$                              & $4 \times 4$ \[#2]
    % -------------------------------------------
    $\begin{bmatrix}
        a_{11} & a_{12} & a_{13} \
        a_{21} & a_{22} & a_{23} \
        a_{31} & a_{32} & a_{33} \
        a_{41} & a_{42} & a_{43} \
    \end{bmatrix}$                              & $4 \times 3$ \
    \bottomrule
\end{tabular}%
}


\begin{document}\noindent
\MyTable{0.0ex}{0.0ex}
\MyTable{2.0ex}{2.0ex}
\MyTable{2.0ex}{4.0ex}
\end{document}
Community
  • 1
Peter Grill
  • 223,288
  • 1
    I have no problem to see it with e.g. \MyTable{2.0ex}{12.0ex} or 10mm. The first effect is seen at 5ex. It depends to the math mode that you cannot really see it. –  May 24 '14 at 08:02

3 Answers3

2

I do not know why it doesn't work. But using \noalign{\vspace{#2}} works.

\documentclass{article}
\usepackage[paperwidth=21cm]{geometry}% To eliminate warning in MWE
\usepackage{amsmath}
\usepackage{booktabs}

\newcommand*{\MyTable}[2]{%
\begin{tabular}[t]{@{}cc@{}}\toprule
    #1 & #2 \\
    \cmidrule{1-2}
    $\begin{bmatrix}
        a_{11} & a_{12} &  a_{13} & a_{14} \\
    \end{bmatrix}$                             & $1 \times 4$ \\[#1]
    % -------------------------------------------
    $\begin{bmatrix}
        a_{11} & a_{12} & a_{13} & a_{14} \\
        a_{21} & a_{22} & a_{23} & a_{24} \\
        a_{31} & a_{32} & a_{33} & a_{34} \\
        a_{41} & a_{42} & a_{43} & a_{44} \\
    \end{bmatrix}$                             & $4 \times 4$ \\\noalign{\vspace{#2}}
    % -------------------------------------------
    $\begin{bmatrix}
        a_{11} & a_{12} & a_{13} \\
        a_{21} & a_{22} & a_{23} \\
        a_{31} & a_{32} & a_{33} \\
        a_{41} & a_{42} & a_{43} \\
    \end{bmatrix}$                             & $4 \times 3$ \\
    \bottomrule
\end{tabular}%
}

\begin{document}\noindent
\MyTable{0.0ex}{0.0ex}
\MyTable{2.0ex}{2.0ex}
\MyTable{2.0ex}{4.0ex}
\end{document}

enter image description here

  • 1
    The spacing inserted with \\[<length>] is just added to the minimum depth of the row; if the natural depth exceeds the minimum depth resulting from this, no space is added. With \noalign{\vspace{<lenght>} you're adding the space no matter what. Another way is to say \\ \\[-1ex], that is, adding a dummy row and some backing up. – egreg May 24 '14 at 10:24
  • @egreg thanks. I doubted it but was not sure. Thank you. –  May 24 '14 at 20:38
  • This is a good solution to the problem as I don't need to think about how much to adjust the baseline by -- all I really care about is the space between the bottom of one row and the top of the next one. – Peter Grill May 25 '14 at 00:17
  • Side note, because tabular vertical rules | are constructed with individual vertical rules on each row, adding glues between rows with this method will break the rules. – user202729 Jun 13 '22 at 05:41
2

The amounts of extra vertical space you're providing -- 2ex and 4ex -- aren't enough to have an effect. To wit, if you chose 10ex or 15ex, the effect is readily apparent.

If you're not sure from where to start the calculation of the desired amount of extra vertical spacing: The "baseline" is where the 1\times4, 4\times4, and 4\times3 terms show up.

enter image description here

\documentclass{article}
\usepackage[paperwidth=21cm]{geometry}% To eliminate warning in MWE
\usepackage{amsmath}
\usepackage{booktabs}

\newcommand*{\MyTable}[2]{%
\begin{tabular}[t]{@{}cc@{}}\toprule
    #1 & #2 \\
    \cmidrule{1-2}
    $\begin{bmatrix}
        a_{11} & a_{12} &  a_{13} & a_{14} \\
    \end{bmatrix}$                              & $1 \times 4$ \\[#1]
    % -------------------------------------------
    $\begin{bmatrix}
        a_{11} & a_{12} & a_{13} & a_{14} \\
        a_{21} & a_{22} & a_{23} & a_{24} \\
        a_{31} & a_{32} & a_{33} & a_{34} \\
        a_{41} & a_{42} & a_{43} & a_{44} \\
    \end{bmatrix}$                              & $4 \times 4$ \\[#2]
    % -------------------------------------------
    $\begin{bmatrix}
        a_{11} & a_{12} & a_{13} \\
        a_{21} & a_{22} & a_{23} \\
        a_{31} & a_{32} & a_{33} \\
        a_{41} & a_{42} & a_{43} \\
    \end{bmatrix}$                              & $4 \times 3$ \\
    \bottomrule
\end{tabular}%
}

\begin{document}\noindent
\MyTable{0ex}{0ex}
\MyTable{10ex}{10ex}
\MyTable{15ex}{15ex}
\end{document}
Mico
  • 506,678
1

You can also try to add \rule{0pt}{#n}

\documentclass{article}
\usepackage[paperwidth=21cm]{geometry}% To eliminate warning in MWE
\usepackage{amsmath}
\usepackage{booktabs}

\newcommand*{\MyTable}[2]{%
\begin{tabular}[t]{@{}cc@{}}\toprule
    #1 & #2 \\
    \cmidrule{1-2}
    $\begin{bmatrix}
        a_{11} & a_{12} &  a_{13} & a_{14} \\
    \end{bmatrix}$                              & $1 \times 4$ \\ \rule{0pt}{#1}
    % -------------------------------------------
    $\begin{bmatrix}
    a_{11} & a_{12} & a_{13} & a_{14} \\
    a_{21} & a_{22} & a_{23} & a_{24} \\
    a_{31} & a_{32} & a_{33} & a_{34} \\
    a_{41} & a_{42} & a_{43} & a_{44} \\
\end{bmatrix}$                              & $4 \times 4$ \\ \rule{0pt}{#2}
% -------------------------------------------
$\begin{bmatrix}
    a_{11} & a_{12} & a_{13} \\
    a_{21} & a_{22} & a_{23} \\
    a_{31} & a_{32} & a_{33} \\
    a_{41} & a_{42} & a_{43} \\
\end{bmatrix}$                              & $4 \times 3$ \\
\bottomrule
\end{tabular}%
}

\begin{document}\noindent
\MyTable{6ex}{6ex}
\MyTable{7ex}{7ex}
\MyTable{8ex}{8ex}
\end{document}
Peter Grill
  • 223,288
SLx64
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