Changing of the numbering of parts in beamer

Question

I want to change the part numbering in beamer.

I tried the following:

\renewcommand*{\thepart}{\arabic{part}}
\renewcommand{\thepart}{\arabic{part}}

but without any success. The Roman numbering stays.

What would be the best way to do it?

Answer 1

You should modify the part page template; it is defined as:

% Part page: default

\defbeamertemplate*{part page}{default}[1][]
{
  \begin{centering}
    {\usebeamerfont{part name}\usebeamercolor[fg]{part name}\partname~\insertromanpartnumber}
    \vskip1em\par
    \begin{beamercolorbox}[sep=16pt,center,#1]{part title}
      \usebeamerfont{part title}\insertpart\par
    \end{beamercolorbox}
  \end{centering}
}

and it uses \insertromanpartnumber. There is a simple method to get arabic numebers: change the previous command into \insertpartnumber.

Quoting the beameruserguide:

The following commands are useful for this template:

• \insertpart inserts the current part name.
• \insertpartnumber inserts the current part number as an Arabic number into a template.
• \insertpartromannumber inserts the current part number as a Roman number into a template.

Here is a MWE:

\documentclass{beamer}
\usepackage{lmodern}

\setbeamertemplate{part page}
{
  \begin{centering}
    {\usebeamerfont{part name}\usebeamercolor[fg]{part name}\partname~\insertpartnumber}
    \vskip1em\par
    \begin{beamercolorbox}[sep=16pt,center]{part title}
      \usebeamerfont{part title}\insertpart\par
    \end{beamercolorbox}
  \end{centering}
}

\begin{document}
\part{Review of Previous Lecture}
\frame{\partpage}
\section[Previous Lecture]{Summary of the Previous Lecture}
\subsection{Topics}
\frame{...}
\subsection{Learning Objectives}
\frame{...}

\part{Today's Lecture}
\frame{\partpage}
\section{Topic A}
\frame{\tableofcontents[currentsection]}
\subsection{Foo}
\frame{...}
\section{Topic B}
\frame{\tableofcontents[currentsection]}
\subsection{bar}
\frame{...}

\end{document}

---

To change the label Part into Theme for example, you should proceed like this:

\renewcommand{\partname}{Theme}