\documentclass{beamer}

% Package graphicx for managing figures
\usepackage{graphicx}

% Theme
% For a list of supported themes, see
% https://deic.uab.cat/~iblanes/beamer_gallery/index_by_theme.html
\usetheme{CambridgeUS}


% Uncomment next line if you would like to add logo at the 
% bottom right of each slide.
% NOTE: Check if the image  is appropriate
% \logo{\includegraphics{upatrasLogo-stamp-small.jpg}}



% Change style of table of contents frame/slide in the 
% following way::
%  - Use simple numbering - no bubbles
%  - Using different color for section numbers 
\setbeamertemplate{section in toc}{%
	{\color{darkred}\inserttocsectionnumber.}~\inserttocsection}
\setbeamercolor{subsection in toc}{bg=white,fg=darkred}
\setbeamertemplate{subsection in toc}{%
	\hspace{1.2em}{\color{purple}\rule[0.3ex]{3pt}{3pt}}~\inserttocsubsection\par}



% Make sure figures will be numbered
\setbeamertemplate{caption}[numbered]


% Custom color (here blue)
% Uncomment next  two lines to define custom color for current theme
% \definecolor{UBCblue}{rgb}{0.04706, 0.13725, 0.26667}
% \usecolortheme[named=UBCblue]{structure}


\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage[greek,english]{babel}

\newcommand{\gr}{\selectlanguage{greek}}
\newcommand{\en}{\selectlanguage{english}}






%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%
%
% End of preamble. Document starts from here
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%




\begin{document}
\en


% Fill out arguments of next commands as fit necessary

\title[footer title]{Title of presentation }

\author[Author name (empty to remove)]{Author name }

\institute[]{
	
	\footnotesize \emph{ Master's Degree \\ Applied Economics and Data Analysis} \\  Department of Economics \\ 
	 School of Economics and Business \\
     UNIVERSITY OF PATRAS \\
   
    \includegraphics[scale=0.30]{upatrasLogo-stamp.jpg}

} % institute end

% Display current date ONLY in footer. Not on the title page. 
% if you would like also current date on the title page, add
% \today in mandatory argument
\date[\today]{}




%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
% Fames/slides start from here.
%
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



% This will generate title frame only taking into consideration arguments set
% above (i.e. first frame containing title, author etc)
\maketitle



% Διαφάνεια με πίνακα περιεχομένων παρουσίασης
% ΣΗΜΑΝΤΙΚΟ: Χρειάζεται η προσθήκη \section και \subsection
\begin{frame}{Table of contents}
	\tableofcontents
\end{frame}


% Παρουσιάζει μία διαφάνεια ΠΡΙΝ από κάθε ενότητα
% που παρουσιάζει την τρέχουσα ενότητα. 
\AtBeginSection[ ] {
	\begin{frame}{Table of contents}
		\tableofcontents[currentsection]
	\end{frame}
}



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Actual frames/slides with content  start from here 
% NOTE: Frames are divited in sections in order
%             to generate table of contents.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



% These section will appear in the table of contents frame/slide
\section{Introduction}

% Next frame/slide. 
% Text in this frame starts at the top (see [t])

\begin{frame}[t]
\frametitle{Introduction}  
Text starting at the top of frame (see [t] at the frame definition).

\end{frame}


\subsection{Subsection 1}

% Next frame
\begin{frame}
	\frametitle{Subsection 1 slide} 
	...
\end{frame}



\subsection{Subsection 2}

% Next frame
\begin{frame}
	\frametitle{Subsection 2 slide} 
	...
\end{frame}




\section{Lists}
 
% Next frame
\begin{frame}
\frametitle{Lists}  
An item list
\begin{itemize}
	\item item 1 
	\item item 2 
	\item item 3
	\item item 4
\end{itemize}
Text after list.
\end{frame}



\section{Adding figure}

% Next frame
\begin{frame}
	\frametitle{Example figure}  
	A figure added to a slide
	
	\begin{figure}[h]
		
	\centering	
	\includegraphics[scale=0.10]{cossin.jpg}
	\caption{ Sine and Cosine functions }
	\label{fig:sinecosine}
    \end{figure}
	
	Referencing the above image:  \ref{fig:sinecosine} . Can also be done from within a different frame.
\end{frame}



\section{Conclusions}

% Next frame
\begin{frame}
	\frametitle{Conclusions}  
\end{frame}



\end{document} % end of beamer template