[Tex/LaTex] Two columns figure using subfloat

floatsieeetransubfloats

I am trying to make a two column figure of set of subfigures using subfloat. My problem is that the figure appears in one column only and
the rest of the figure is not displayed as shown in the following figure

enter image description here

this is my code : 

\documentclass[journal]{IEEEtran}
    \usepackage{graphicx}
    \usepackage{subfloat}
    \usepackage{subfig}
    \usepackage{algorithmic}

\begin{document}
    \begin{figure}
   \centering
   \subfloat[Tree-2]{\includegraphics[scale=0.45]{img1.png}}\label{img1}
   \subfloat[Tree-4]{\includegraphics[scale=0.45]{img2.png}}\label{img2}\\
   \subfloat[Tree-6]{\includegraphics[scale=0.45]{img3.png}}\label{img3}
   \subfloat[Tree-10]{\includegraphics[scale=0.45]{img4.png}}\label{img4}\\
   \subfloat[Tree-15]{\includegraphics[scale=0.45]{img5.png}}\label{img5}
   \subfloat[Tree-20]{\includegraphics[scale=0.45]{img6.png}}\label{img6}\\
   \caption{confusion matrix.}
   \label{fig:confusion}
   \end{figure}

\end{document}

Best Answer

Alternatively to my above comment:

If you use a double-column format like IEEEtran, you might want to use the figure* environment instead of the figure environment. figure only occupies one column. figure* spans both.

Related Question