I want to create a single table in two column article, where internally table contains two tables, one in each column. The following picture shows the requirements.
[Tex/LaTex] Single Table with Two columns (tables) in two column article
tablestwo-column
Related Solutions
Since you mentioned IEEE, in these documentclass(es) the starred versions of table and figure span the whole page.
To have a highlighted (colored) line, just add rowcolor{your_favorite_color} before the line in question. To make this available, you need to load the colortbl and the (xcolor or color) packages in the preamble.
In my example the lipsum package is just necessary to generate some random text.
Here's a MWE you can try (I kept the title and author info from the downloadable template):
\documentclass[conference]{IEEEtran}
\usepackage{xcolor}% you could also use the color package
\usepackage{colortbl}
\usepackage{lipsum}
\begin{document}
\title{Bare Demo of IEEEtran.cls for Conferences}
\author{\authorblockN{Michael Shell}
\authorblockA{School of Electrical and\\Computer Engineering\\
Georgia Institute of Technology\\
Atlanta, Georgia 30332--0250\\
Email: mshell@ece.gatech.edu}
\and
\authorblockN{Homer Simpson}
\authorblockA{Twentieth Century Fox\\
Springfield, USA\\
Email: homer@thesimpsons.com}
\and
\authorblockN{James Kirk\\ and Montgomery Scott}
\authorblockA{Starfleet Academy\\
San Francisco, California 96678-2391\\
Telephone: (800) 555--1212\\
Fax: (888) 555--1212}}
\maketitle
\begin{abstract}
The abstract goes here.
\end{abstract}
\section{Table Example}
\lipsum[1]
\begin{table*}
\centering
\begin{tabular}{|c|c|c|}
\hline
\rowcolor{gray}
A & B & C\\
\hline
1 & 2 & 3\\
\hline
\end{tabular}
\end{table*}
\lipsum[2-15]
\end{document}
May be this is what you are after:
\documentclass[11pt,twocolumn,conference]{IEEEtran}
\usepackage{amsmath,array,graphicx}
\usepackage{kantlipsum}
\begin{document}
\kant[1-2]
\begin{table}[htb]
\caption{hello2 testing}
\label{1234}
\resizebox{\columnwidth}{!}{%
\begin{tabular}{c*{5}{>{$}c<{$}}}
& \text{LfdR} & \text{KLSRf} & \text{MLDFSP} & \text{PNDND} & \text{LDFSSVM} \\
Aa & 97.8\pm 2.3 & 97.4\pm 3.0 & 97.4\pm 3.0 & 97.0\pm 3.6 & 99.1\pm 1.8 \\
Al & 69.8\pm 9.5 & 93.6\pm 3.6 & 86.9\pm 8.4 & 91.5\pm 4.5 & 94.9\pm 5.4 \\
Av & 97.0\pm 2.9 & 99.2\pm 1.8 & 99.6\pm 1.4 & 98.3\pm 2.9 & 99.6\pm 1.4 \\
Aw & 97.8\pm 3.1 & 95.3\pm 3.1 & 96.2\pm 2.5 & 92.4\pm 3.3 & 97.5\pm 3.0 \\
Ay & 77.5\pm 7.2 & 90.2\pm 4.1 & 90.2\pm 5.7 & 88.1\pm 4.8 & 91.6\pm 4.9 \\
avg & 88.0 & 95.1 & 94.1 & 93.5 & 96.5
\end{tabular}
}
\end{table}
\kant[3-5]
\end{document}
I have used \resizebox from graphicx package ti re-size the table to fit inside the column. Also, I have replaced all +- in to \pm.
Best Answer
The following will be a good starting point for you. For other tweaks (including centering of individual tables and captions), you need to study a bit more. Please see these, 1, 2, 3.
For the particular issue of placing a double column float at page bottom, this article is a good read.