I made a figure containing subfigures, but it keeps appearing in a whole page, so lots of white space. I don't know why. This picture explains what i mean:

This is the code used:
\clearpage
\begin{figure*}[t]
\centering
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/k640_Sensor_Lights_On_1000mm-pgms/k640_Sensor_Lights_On_1000mm-pgms_no_of_levels}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/k640_Sensor_Lights_On_1000mm-pgms/k640_Sensor_Lights_On_1000mm-pgms_entropy}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/k640_Sensor_Lights_On_1000mm-pgms/k640_Sensor_Lights_On_1000mm-pgms_mean}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x640_Sensor_Lights_On_1000mm-pgms/x640_Sensor_Lights_On_1000mm-pgms_no_of_levels}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x640_Sensor_Lights_On_1000mm-pgms/x640_Sensor_Lights_On_1000mm-pgms_entropy}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x640_Sensor_Lights_On_1000mm-pgms/x640_Sensor_Lights_On_1000mm-pgms_mean}}\\
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x320_Sensor_Lights_On_1000mm-pgms/x320_Sensor_Lights_On_1000mm-pgms_no_of_levels}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x320_Sensor_Lights_On_1000mm-pgms/x320_Sensor_Lights_On_1000mm-pgms_entropy}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x320_Sensor_Lights_On_1000mm-pgms/x320_Sensor_Lights_On_1000mm-pgms_mean}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x320_Sensor_Lights_On_1000mm-pgms/x320_Sensor_Lights_On_1000mm-pgms_mean}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x320_Sensor_Lights_On_1000mm-pgms/x320_Sensor_Lights_On_1000mm-pgms_mean}}
\subfloat[]{\includegraphics[width=.33\linewidth]{../Hussein/MatFiles/Lights/x320_Sensor_Lights_On_1000mm-pgms/x320_Sensor_Lights_On_1000mm-pgms_mean}}
\caption{aaa}
\label{fig:rulascore}
\end{figure*}
\clearpage, then it will internally start a new page, and using only a float on that page, causes it to be vertically centred as you showed. What do you have other than this figure in your code? Is there anything following it? Is it at the end of a chapter? Also, why are you usingfigure*? – Werner Apr 13 '13 at 04:14\clearpageand see what happens. – Werner Apr 13 '13 at 05:15