[Tex/LaTex] Overfull \hbox too wide in table

tables

I have the following table 

\documentclass[10pt,twocolumn,letterpaper]{article}

\usepackage{graphicx}
\usepackage{array}

\newcolumntype{M}[1]{>{\centering\arraybackslash}m{#1}}


\begin{document}
\section{Results}
\label{Sec:results}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%       Table          %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    \begin{table}[tb]
    \centering  
    \tabcolsep = 0.01\textwidth %0.18cm
    \begin{tabular}{| m{0.17\textwidth} | M{0.1\textwidth} | M{0.1\textwidth}|}
    \hline
     \centering\textbf{Method} & \textbf{Input} & \textbf{Accuracy}
     \tabularnewline
    \hline
        3DShapeNets  & volumetric & 84.7\\
        Voxnet  & volumetric & 85.9\\
    \hline
        PointNet  & points & 89.2 \\
        PointNet++  & points & 90.7 \\
        Kd-network& points & 91.8 / 90.6 \\
    \hline
    Ours & points & ? \\
    \hline
    \end{tabular}
    \caption{Classification Accuracy on ModelNet40 dataset}
    \label{table:ClassificationAcc}
\end{table}

    \begin{table}[tb]
    \centering  
    \tabcolsep = 0.01\textwidth %0.18cm
    \begin{tabular}{|m{0.12\textwidth}|M{0.1\textwidth}|M{0.15\textwidth}|M{0.08\textwidth}|}
    \hline
    \centering\textbf{Method} &  \textbf{ Data} & \textbf{Permutations} & \textbf{Points}  
     \tabularnewline
    \hline
        PointNet &  & &\\
        PointNet++ &  &  &\\
        Kd-Network &  & &\\
    \hline
    \end{tabular}
    \caption{Challenges summary }
    \label{table:ChallangeComp}
\end{table}


    \subsection{Architecture Design Analysis}
    \label{SubSec:Arch_Dn_Analysis}

    \subsection{Visualizations}
    \label{SubSec:Vis}

\end{document}

I get a warning Overfull \hbox (... too wide) …
Why is this happening and how can I solve it ?

Best Answer

problematic is your second table. it is wider than column width. it is possible to make it narrower, however content of table is unknown, so the obtained result probably in real document will not works.

enter image description here

as you can see, i change table layout. for my taste now looks better. for this i add two new packages: booktabs for rules and siunitx for S column type. i also assume that content of column header is the widest cells contents.

\documentclass[10pt,twocolumn,letterpaper]{article}
\usepackage{siunitx}
\usepackage{array, booktabs}
\newcommand\mc[1]{\multicolumn{1}{>{\bfseries}c}{#1}}

\usepackage{lipsum}

\begin{document}
    \section{Results}
    \label{Sec:results}
\lipsum[22]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%       Table
    \begin{table}[htb]
    \centering
\begin{tabular}{l l S[table-format=2.1]}
    \toprule
\mc{Method} & \mc{Input}    & \mc{Accuracy} \\
    \midrule
3DShapeNets & volumetric    & 84.7          \\
Voxnet      & volumetric    & 85.9          \\
    \midrule
PointNet    & points        & 89.2          \\
PointNet++  & points        & 90.7          \\
Kd-network  & points        & {91.8 / 90.6} \\
    \midrule
Ours        & points        & {?}           \\
    \bottomrule
    \end{tabular}
\caption{Classification Accuracy on ModelNet40 dataset}
    \label{table:ClassificationAcc}
\end{table}
\lipsum[44]
    \begin{table}[htb]
    \centering
\begin{tabular}{ l l l l}
    \toprule
\mc{Method} & \mc{Data}     & \mc{Permutations} & \mc{Points}   \\
    \midrule
PointNet    &               &                   &               \\
PointNet++  &               &                   &               \\
Kd-Network  &               &                   &               \\
    \bottomrule
\end{tabular}
\caption{Challenges summary }
    \label{table:ChallangeComp}
\end{table}
\lipsum

    \subsection{Architecture Design Analysis}
    \label{SubSec:Arch_Dn_Analysis}

    \subsection{Visualizations}
    \label{SubSec:Vis}
\end{document}

above mwe gives no error, no warning, no bad boxes.

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