1

my Friends, I am working with beamer for slide generating. I wanna make a multi-frame slide which there is an equation on it. in the first frame, some equations exist. But at the second frame, I want a part of the equation to be highlighted. my example MWE is as follows:

\documentclass{beamer}

\begin{document}
\begin{frame}
\frametitle{governing equations}
\begin{exampleblock}{Reynolds-averaged Navier stokes}
 \begin{itemize}
      \item 
    continuity

$\frac{\partial (U_i)}{\partial x_i}=0$
      \end{itemize}
       \begin{itemize}
      \item 
      momentum equations:

$\frac{\partial (U_jU_i)}{\partial x_j}=-\frac{1}{\rho}\frac{\partial P}{\partial x_i}+\frac{\partial }{\partial x_j}(\nu\frac{\partial U_i}{\partial x_j}-\overline{u_iu_j})$
      \end{itemize}    
       \begin{itemize}
      \item 
     energy equation:

$\frac{\partial (U_j\Theta )}{\partial x_j}=\frac{\partial }{\partial x_j}(\frac{\nu}{Pr}\frac{\partial \Theta}{\partial x_j}-\overline{u_j\theta})$
      \end{itemize}
\end{exampleblock}
\end{frame}
\end{document}

For example, at the second frame, the \overline{u_iu_j} term in the second equation to be highlighted.

2

If changing the colour to highlight the term is enough, you could do:

\documentclass{beamer}

\begin{document}
\begin{frame}
\frametitle{governing equations}
\begin{exampleblock}{Reynolds-averaged Navier stokes}
 \begin{itemize}
      \item 
    continuity

$\frac{\partial (U_i)}{\partial x_i}=0$
      \end{itemize}
       \begin{itemize}
      \item 
      momentum equations:

$\frac{\partial (U_jU_i)}{\partial x_j}=-\frac{1}{\rho}\frac{\partial P}{\partial x_i}+\frac{\partial }{\partial x_j}(\nu\frac{\partial U_i}{\partial x_j}-\textcolor<2->{red}{\overline{u_iu_j}})$
      \end{itemize}    
       \begin{itemize}
      \item 
     energy equation:

$\frac{\partial (U_j\Theta )}{\partial x_j}=\frac{\partial }{\partial x_j}(\frac{\nu}{Pr}\frac{\partial \Theta}{\partial x_j}-\overline{u_j\theta})$
      \end{itemize}
\end{exampleblock}
\end{frame}
\end{document}
1
  • can you define a colorbox for this term? – mohammad fazli Mar 1 '18 at 9:02
1

Use \alert with an overlay specification like <2>:

\documentclass{beamer}

\begin{document}
\begin{frame}
\frametitle{governing equations}
\begin{exampleblock}{Reynolds-averaged Navier stokes}
 \begin{itemize}
      \item 
    continuity

$\frac{\partial (U_i)}{\partial x_i}=0$
      \end{itemize}
       \begin{itemize}
      \item 
      momentum equations:

$\frac{\partial (U_jU_i)}{\partial x_j}=-\frac{1}{\rho}\frac{\partial P}{\partial x_i}+\frac{\partial }{\partial x_j}(\nu\frac{\partial U_i}{\partial x_j}-\alert<2>{\overline{u_iu_j}})$
      \end{itemize}    
       \begin{itemize}
      \item 
     energy equation:

$\frac{\partial (U_j\Theta )}{\partial x_j}=\frac{\partial }{\partial x_j}(\frac{\nu}{Pr}\frac{\partial \Theta}{\partial x_j}-\overline{u_j\theta})$
      \end{itemize}
\end{exampleblock}
\end{frame}
\end{document}

enter image description here

You can also change the definition of the \alert macro to match the specific way you want to use for highlighting. Here is an example that uses a red colorbox instead of red text color (but be aware: this only works for highlighting inside math environments):

\documentclass{beamer}

\renewcommand<>{\alert}[1]{\alt#2{\colorbox{red}{$#1$}}{#1}}

\begin{document}
\begin{frame}
\frametitle{governing equations}
\begin{exampleblock}{Reynolds-averaged Navier stokes}
 \begin{itemize}
      \item 
    continuity

$\frac{\partial (U_i)}{\partial x_i}=0$
      \end{itemize}
       \begin{itemize}
      \item 
      momentum equations:

$\frac{\partial (U_jU_i)}{\partial x_j}=-\frac{1}{\rho}\frac{\partial P}{\partial x_i}+\frac{\partial }{\partial x_j}(\nu\frac{\partial U_i}{\partial x_j}-\alert<2>{\overline{u_iu_j}})$
      \end{itemize}    
       \begin{itemize}
      \item 
     energy equation:

$\frac{\partial (U_j\Theta )}{\partial x_j}=\frac{\partial }{\partial x_j}(\frac{\nu}{Pr}\frac{\partial \Theta}{\partial x_j}-\overline{u_j\theta})$
      \end{itemize}
\end{exampleblock}
\end{frame}
\end{document}

enter image description here

2
  • can you define a colorbox for this term? – mohammad fazli Mar 1 '18 at 9:02
  • @mohammadfazli: See the update to my answer. – Tiuri Mar 1 '18 at 9:15

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