# insert images into a tabular environment

I have 8 images, in which i want two images across, by 4 images down. I am trying to do this with the following code:

\begin{figure}[htb]
\centering
\begin{tabular}{@{}cccc@{}}
\includegraphics[scale=0.4]{../random_forest/TP-Pred/program/error1.jpg}
\includegraphics[scale=0.4]{../random_forest/AFP-AFP-like/program/error1.jpg}
\includegraphics[scale=0.4]{../random_forest/TP-Pred/program/error1.jpg}
\includegraphics[scale=0.4]{../random_forest/AFP-AFP-like/program/error1.jpg}
\multicolumn{4}{c}{\includegraphics[width=.23\textwidth]{example-image-a}}
\end{tabular}
\caption{A plot of the random forest error split culmulatively over the 4 sets of features}
\end{figure}


however all 4 images appear on the same horizontal line. How do I get them to appear like:

image 1      image 2
image 3      image 4
image 5      image 6
image 7      image 8


• use \\ within a tabular to start a new line :) – cmhughes Nov 5 '13 at 20:27
• also you have a 4 column tabular but have put all the images in the same cell you need & between the cells. – David Carlisle Nov 5 '13 at 20:36

I gather the eight jpegs are all the same size, right? In that case, there's no need to embed them in a tabular environment. You could do the following instead:

\begin{figure}[htb]
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image1.jpg}%
\hspace*{\fill}% induce some horizontal separation between images 1 and 2
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image2.jpg}

\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image3.jpg}%
\hspace*{\fill}% induce some horizontal separation between images 3 and 4
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image4.jpg}

\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image5.jpg}%
\hspace*{\fill}% induce some horizontal separation between images 5 and 6
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image6.jpg}

\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image7.jpg}%
\hspace*{\fill}% induce some horizontal separation between images 7 and 8
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image8.jpg}

\caption{A plot of the random forest error split culmulatively over the 4 sets of features}
\end{figure}


Observe that a blank line will automatically force the following images to show up on a new "line". If you want more than the minimum amount of vertical separation, you could insert directives such as \smallskip, \medskip, or \bigskip (while still leaving a blank line to force a line break).

Addendum: If you really want/need to embed the images in a tabular structure, I would recommend you use the tabular* environment and set its width to \textwidth to assign as much width as possible to the images. The somewhat odd looking construct @{\extracolsep{\fill}} spreads the two columns maximally apart.

\begin{figure}[htb]
\begin{tabular*}{\textwidth}{@{} c @{\extracolsep{\fill}} c @{}}
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image1.jpg}&
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image2.jpg}\\
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image3.jpg}&
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image4.jpg}\\
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image5.jpg}&
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image6.jpg}\\
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image7.jpg}&
\includegraphics[width=0.45\textwidth]{../random_forest/TP-Pred/image8.jpg}\\
\end{tabular*}
\caption{A plot of the random forest error split culmulatively over the 4 sets of features}
\end{figure}