Table merging with two columns and text in IEEE conference latex format

Question

1: htemphasized texttp://i.sstatic.net/MP5IU.png

Dear Sir or madam,

The table i created in ieee latex template is being fixed to one column, its extending for the entire width. Please help. Thank you

\begin{table}
  \centering
  \renewcommand\arraystretch{1.5}
  \begin{tabularx}{\textwidth}{p{2cm}p{2cm}p{4.5cm}p{2cm}}
    \toprule
    \centering\textbf{Technique Used} &
    \centering\textbf{Premise Considered} &
    \centering\textbf{Attributes} &
    \centering\textbf{Approach} \cr
    \midrule
    Potential Fields \cite{howard2002mobile} &
    Location information and range &
    Balanced deployment with the help of repulsive mechanism, when in proximity to obstacles &
\cr
\cline{1-3}
%
DSS Algorithm \cite{heo2003intelligent} &
Location information &
A profitable scheme to conserve energy during deployment of a WSN divided into clusters &
\multirow{-2}{2cm}{Virtual forces} \cr
\hline

Co-Fi \cite{ganeriwal2004self} &
Location information &
Ditributed scheme to conserve energy and provide regulated coverage fidelity &
\cr
\cline{1-3}
VEC, VOR, Minmax \cite{wang2006movement} &
Location information &
Identify coverage holes and enabling sensors to move away from dense area &
\multirow{-2}{2cm}{Computational geometry} \cr
\bottomrule
\end{tabularx}
\caption{Location information and varying topology problem.}
\label{tab:1}
\end{table}

Answer 1

You can use the resizebox environment to specify the width of your table. In this example I set the width to 12cm.

\resizebox{12cm}{!} {
  \begin{tabular}
   %the content of your table
  \end{tabular}
 }

Answer 2

You should be using \columnwidth instead of \textwidth in

\begin{tabularx}{\columnwidth}{@{}p{0.15\columnwidth}p{0.2\columnwidth}
                                  p{0.3\columnwidth}p{0.15\columnwidth}}

Full code:

\documentclass{ieeetran}
\usepackage{tabularx,multirow,booktabs,lipsum}
\begin{document}
  \begin{table}
  \centering
  \renewcommand\arraystretch{1.5}
  \begin{tabularx}{\columnwidth}{@{}p{0.15\columnwidth}p{0.2\columnwidth}p{0.3\columnwidth}p{0.15\columnwidth}}
    \toprule
    \centering\textbf{Technique Used} &
    \centering\textbf{Premise Considered} &
    \centering\textbf{Attributes} &
    \centering\textbf{Approach} \cr
    \midrule
    Potential Fields \cite{howard2002mobile} &
    Location information and range &
    Balanced deployment with the help of repulsive mechanism, when in proximity to obstacles &
\cr
\cline{1-3}
%
DSS Algorithm \cite{heo2003intelligent} &
Location information &
A profitable scheme to conserve energy during deployment of a WSN divided into clusters &
\multirow{-2}{0.15\columnwidth}{Virtual forces} \cr
\hline

Co-Fi \cite{ganeriwal2004self} &
Location information &
Ditributed scheme to conserve energy and provide regulated coverage fidelity &
\cr
\cline{1-3}
VEC, VOR, Minmax \cite{wang2006movement} &
Location information &
Identify coverage holes and enabling sensors to move away from dense area &
\multirow{-2}{0.15\columnwidth}{Computational geometry} \cr
\bottomrule
\end{tabularx}
\caption{Location information and varying topology problem.}
\label{tab:1}
\end{table}
\lipsum
\end{document}