Rotate box overflow the merged column in table

Question

I'm sorry for the ambiguity of the question's title.

I'm working with a 2-columns latex template. Here's my MWE:

\begin{table}
\centering
\caption{My table}
\resizebox{\columnwidth}{!}{%
\begin{tabular}{ccc|cc|cc}
\toprule
\multirow{2}{*}{\rotatebox{90}{Rank}}     & \multirow{2}{*}{\rotatebox{90}{FLOPs ↓\%}}          & \multirow{2}{*}{\rotatebox{90}{Params. ↓\%}}                     & \multicolumn{2}{c|}{NMSE}    & \multicolumn{2}{c}{Accuracy (\%)}    \\
\cmidrule{4-7}
     & &     & Before    & After           & Before    & After               \\
\midrule
1       & 88.03        & 87.06          & 0.xxxx    & 0.1613          & 10        & 93.84               \\
2       & 76.44        & 75.98          & 0.xxxx    & 0.1508          & 10        & 94.11               \\
3       & 64.85        & 64.91          & 0.xxxx    & 0.1420          & 68.1      & 94.18               \\
4       & 53.27        & 53.84          & 0.xxxx    & 0.1383          & 89.96     & 94.07               \\
5       & 41.69        & 42.76          & 0.xxxx    & 0.1348          & 92.5      & 94.22               \\
6       & 30.10        & 31.69          & 0.xxxx    & 0.1541          & 93.38     & 94.15               \\
7       & 18.51        & 20.61          & 0.xxxx    & 0.1333          & 93.89     & 94.11               \\
8       & 6.93         & 9.54           & 0.xxxx    & 0.0011          & 94.03     & 94.03               \\
\bottomrule
\end{tabular}
}
\end{table}

This code yields the table:

I have 2 problems:

1. The FLOPs and Params columns overflowed the cell. How can I fix this? My main idea is to rotate the cell so that the resized table can be bigger.
2. I want the vertical dividing lines between 2 columns Params and NMES, and NMES and Accuracy to cross over the first line.

Thank you very much!

Answer 1

Some suggestions:

• Never, ever use \resizebox to force a table into the width of the textblock (here: \columnwidth), unless you don't mind showing your contempt for your readers openly -- and aren't too worried about the backlash you might experience as a consequence.

  If you don't believe me or don't know what I'm talking about, you should still refrain from using \resizebox.

• You're not setting aside enough vertical space for the rotated column headers. I suggest you change all instances of \multirow{2} to \multirow{4} and insert two extra blank rows in the header.

• Don't use vertical rules if you want to use the line-drawing macros of the booktabs package. No exceptions. None.

• To make the table more readable, do align the numbers in columns 2 thru 7 on their decimal markers. This may be done with the help of the machinery of the siunitx package; see the code below for a practical implementation of this idea.

• If you believe the table's width should equal \columnwidth exactly, consider using a tabular* environment. See the code for the second table shown below for a practical implementation of this idea.

\documentclass{IEEEtran} % or some other suitable document class
\usepackage{newtxtext,newtxmath} % optional (Times Roman font)
\usepackage{graphicx,booktabs,multirow}
\usepackage{siunitx}
\newcolumntype{T}[1]{S[table-format=#1]}
\usepackage{lipsum} % filler text
\begin{document}
\begin{table}[h]
\centering
\caption{with \texttt{tabular}}
\begin{tabular}{@{} l {2}{T{2.2}} {2}{T{1.4}} {2}{T{2.2}} @{}}
\toprule
 \multirow{4}{}{\rotatebox{90}{Rank}} & 
{\multirow{4}{}{\rotatebox{90}{FLOPs ↓%}}} & 
{\multirow{4}{}{\rotatebox{90}{Params. ↓%}}} & 
\multicolumn{2}{c}{NMSE} & 
\multicolumn{2}{c@{}}{Accuracy (%)} \
\cmidrule(lr){4-5} \cmidrule(l){6-7}
 & & & {Before} & {After} & {Before} & {After} \
\ \
\midrule
1 & 88.03 & 87.06   & 0.1111 & 0.1613 & 10    & 93.84 \
2 & 76.44 & 75.98   & 0.1111 & 0.1508 & 10    & 94.11 \
3 & 64.85 & 64.91   & 0.1111 & 0.1420 & 68.1  & 94.18 \
4 & 53.27 & 53.84   & 0.1111 & 0.1383 & 89.96 & 94.07 \
5 & 41.69 & 42.76   & 0.1111 & 0.1348 & 92.5  & 94.22 \
6 & 30.10 & 31.69   & 0.1111 & 0.1541 & 93.38 & 94.15 \
7 & 18.51 & 20.61   & 0.1111 & 0.1333 & 93.89 & 94.11 \
8 &  6.93 &  9.54   & 0.1111 & 0.0011 & 94.03 & 94.03 \
\bottomrule
\end{tabular}
\bigskip\bigskip
\setlength\tabcolsep{0pt}
\caption{with \texttt{tabular}}
\begin{tabular}{\columnwidth}{@{\extracolsep{\fill}} l {2}{T{2.2}} {2}{T{1.4}} {2}{T{2.2}} }
\toprule
 \multirow{4}{}{\rotatebox{90}{Rank}} & 
{\multirow{4}{}{\rotatebox{90}{FLOPs ↓%}}} & 
{\multirow{4}{}{\rotatebox{90}{Params. ↓%}}} & 
\multicolumn{2}{c}{NMSE} & 
\multicolumn{2}{c}{Accuracy (%)} \
\cmidrule{4-5} \cmidrule{6-7}
 & & & {Before} & {After} & {Before} & {After} \
\ \
\midrule
1 & 88.03 & 87.06   & 0.1111 & 0.1613 & 10    & 93.84 \
2 & 76.44 & 75.98   & 0.1111 & 0.1508 & 10    & 94.11 \
3 & 64.85 & 64.91   & 0.1111 & 0.1420 & 68.1  & 94.18 \
4 & 53.27 & 53.84   & 0.1111 & 0.1383 & 89.96 & 94.07 \
5 & 41.69 & 42.76   & 0.1111 & 0.1348 & 92.5  & 94.22 \
6 & 30.10 & 31.69   & 0.1111 & 0.1541 & 93.38 & 94.15 \
7 & 18.51 & 20.61   & 0.1111 & 0.1333 & 93.89 & 94.11 \
8 &  6.93 &  9.54   & 0.1111 & 0.0011 & 94.03 & 94.03 \
\bottomrule
\end{tabular*}
\end{table}
\lipsum[1][1-4]
\end{document}