[Tex/LaTex] Multirow table with variable number of rows

multirowtablesvertical alignment

I'd like to format a table in which first column has a single line of text, centered vertically across a variable number of rows. Currently, I am using a IfEqCase and adding an entry in the first column only if some condition is met. This works as long as I have a fixed number of rows, and that number is odd (otherwise, the entry will not be vertically centered) : 

\documentclass[11pt]{article}
\usepackage{multirow}
\usepackage{xstring}

\newcommand{\gridsize}[1]{\ensuremath{#1 \times #1}}

\newcommand{\addrowmpi}[4]{%
\IfEqCase{#1}{%
      {1} {&}  %
      {2} {\gridsize{#2} &}  %
      {4} {&}  %
}
#3 & #4 \%}

\begin{document}

\begin{table}[ht]
\caption{Multi-row table}
\begin{center}
\begin{tabular}{ccc}
    \hline
    \addrowmpi{1}{512}{462.7}{100} \\
    \addrowmpi{2}{512}{231.4}{50}\\
    \addrowmpi{4}{512}{115.7}{25}\\
    \hline
\end{tabular}
\end{center}
\label{tab:multicol}
\end{table}

\end{document}

The result looks like :

enter image description here

But I'd like to have a variable number of rows, formatted ideally with something like addrowmpi. The first column entry should be centered vertically across the rows.

Is there a way I can use the multirow environment with a variable number of rows?

Best Answer

By nesting tables I can do essentially what I had in mind. Here is the code I came up with (simplified somewhat from the above) : 

\documentclass[11pt]{article}
\usepackage{array}

\newcolumntype{L}[1]{>{\raggedright\arraybackslash}m{#1}}
\newcolumntype{C}[1]{>{\centering\arraybackslash}m{#1}}
\newcolumntype{R}[1]{>{\raggedleft\arraybackslash}m{#1}}

\newenvironment{timingtable}
{\begin{tabular}{R{30pt}|R{30pt}|R{30pt}}}
{\end{tabular}}

\newcommand{\addrow}[3]{#1 & #2 &  #3 \%}

\setlength{\tabcolsep}{10pt}

\begin{document}

% Actual width of each column is 30 + 2*tabcolsep
\begin{table}[ht]
\caption{Multi-row table}
\begin{center}
\begin{tabular}{|C{20pt}|@{}p{150pt}@{}|}
    \hline
    512 &
    \begin{timingtable}
    \addrow{462.7}{222.0}{100} \\
    \addrow{231.4}{111.0}{50} \\
    \addrow{154.2}{74.0}{33} \\
    \addrow{115.7}{37.0}{25} \\
    \end{timingtable} \\
   \hline
\end{tabular}
\end{center}
\label{tab:multicol}
\end{table}

\end{document}

Multi-row column

The first column has width 20 + 2*tabcolsep = 40pt, expected. And each column in the nested table has width 30+2*tabcolsep = 50. The @{} in the outer tabular command suppresses the additional tabcolsep space that would be added around the nested table, making the first and last columns of the nested table too wide.

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