I cannot place my plot centered on the page. I tried the following code:
\begin{figure}[ht]
\begin{center}
\begin{minipage}{\columnwidth}
\includegraphics[width=5in]{plot1.pdf}
\end{minipage}
\begin{minipage}{\columnwidth}
\includegraphics[width=5in]{plot2.pdf}
\end{minipage}
\begin{minipage}{\columnwidth}
\includegraphics[width=5in]{plot3.pdf}
\end{minipage}
\caption{xxx}
\end{center}
\end{figure}
As one can recognize, the plot is not centered. Waht should I do to get it centered?
subcaption
package which introduces a subfigure environment.\includegraphics[width=5in]{plot1.pdf}\\ \includegraphics[width=5in]{plot2.pdf}\\ \includegraphics[width=5in]{plot3.pdf}
should suffice. The other issue is whether your figure sizes are larger than the margin widths. Without a full working example, it is hard to tell.