captionsfloats
I want to make some of my figures just without a number.
Instead of Fig. 1: Caption. I want simply Caption.
I tried to do \caption*, but it doesn't work for me even after using the caption package upgrade.
Maybe there are another ways to do this?
You can solve your problem by loading the subcaption package. (The subcaption package is incompatible with packages that provide similar functionality, such as subfigure and subfloat. If you use subcaption, be sure not to load one of these competing packages as well.) The subcaption package provides the environments subfigure and subtable, which take as their argument the desired width of the sub-figure/table in question. In the Minimum Working Example (MWE) below, I've set this width to 0.49\linewidth, as you do in your example code. The MWE also illustrates how many may create cross-references to the entire float as well as to one or more of its components.
Note the use of the \centering commands inside the subfigure environments; it's preferable to use this command rather than \centerline. In addition, since I don't have access to the .png files you list in your code, I've loaded the graphicx package with the demo option -- this will create black "dummy" rectangles. In your "real" code, you should of course omit the demo option.
\documentclass{article}
\usepackage[margin=1in]{geometry}
\usepackage[demo]{graphicx}
\usepackage{subcaption}
\begin{document}
\begin{figure}[t]
\centering
\begin{subfigure}{0.49\linewidth} \centering
\includegraphics[scale=0.2]{figure/figA.png}
\caption{Figure on left side}\label{fig:figA}
\end{subfigure}
\begin{subfigure}{0.49\linewidth} \centering
\includegraphics[scale=0.2]{figure/figB.png}
\caption{Figure on right side}\label{fig:figB}
\end{subfigure}
\caption{Overall caption} \label{fig:twofigs}
\end{figure}
\noindent
Some cross-references: First, we refer to Figure~\ref{fig:twofigs}.
Second, we can also refer to the component figures individually,
viz., to Figures~\ref{fig:figA} and \ref{fig:figB}.
\end{document}
Addendum For more information on what the parameters \linewidth and \textwidth do, see this answer to a question that was posed some time ago, viz., Difference between \textwidth, \linewidth and \hsize.
You shouldn't be using subfigure, but either subfig or subcaption.
Here's the version for subfig:
\documentclass{article}
\usepackage[demo]{graphicx} % demo is just for the example
\usepackage{subfig}
\begin{document}
\begin{figure}
\centering
\subfloat[]{\includegraphics[width=2in]{Figure 2a.png}}\quad
\subfloat[]{\includegraphics[width=2in]{Figure 2b.png}}
\caption{FE model geometry and boundary conditions; (a)~tension\slash compression,
(b)~simple shear}\label{fig:FEmodel}
\end{figure}
\end{document}
Note that the enclosing \mbox is not needed.
A very similar output is obtained with subcaption:
\documentclass{article}
\usepackage[demo]{graphicx} % demo is just for the example
\usepackage{subcaption}
\begin{document}
\begin{figure}
\centering
\begin{subfigure}{2in}
\centering
\includegraphics[width=2in]{Figure 2a.png}
\subcaption{}
\end{subfigure}\quad
\begin{subfigure}{2in}
\includegraphics[width=2in]{Figure 2b.png}
\subcaption{}
\end{subfigure}
\caption{FE model geometry and boundary conditions; (a)~tension\slash compression,
(b)~simple shear}\label{fig:FEmodel}
\end{figure}
\end{document}
Best Answer
You could use
\captionsetupfrom the packagecaptionthat way:This gives: