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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 04-18-2 on page 112.
+%% 
+%%  Copyright (C) 2012 Vo\ss 
+%% 
+%%  It may be distributed and/or modified under the conditions
+%%  of the LaTeX Project Public License, either version 1.3
+%%  of this license or (at your option) any later version.
+%% 
+%%  See http://www.latex-project.org/lppl.txt for details.
+%% 
+
+% Show page(s) 1,2,3,4,5,6
+
+%% ==== 
+\PassOptionsToClass{}{beamer}
+\documentclass{exabeamer}
+\usepackage{beramono}
+
+%\StartShownPreambleCommands
+
+%\StopShownPreambleCommands
+
+\begin{document}
+\begin{frame}[fragile]{Matrix operations}{Use of \texttt{semiverbatim}}
+\setbeamercolor{alerted text}{fg=blue}
+\setbeamerfont{alerted text}{series=\bfseries,family=\ttfamily}
+\footnotesize\begin{semiverbatim}
+\uncover<1->{\alert<0>{\alert<6>{sub \color{red}matrix_row2vector} \{}}
+\uncover<2->{\alert<2>{ my $m = shift; my($rows,$cols) = ($m->[1],$m->[2]);}}
+\uncover<2->{\alert<2>{ my $r = shift; # optional, which column from matrix}}
+\uncover<2->{\alert<2>{ croak "Error: matrix doesn't have 3D rows" unless ($cols==3);}}
+\uncover<3->{\alert<3>{ if ( defined $r ) \{}}
+\uncover<3->{\alert<3>{  croak "Error:matrix doesn't have that row"unless($r<$rows);}}
+\uncover<3->{\alert<3>{ \}}}
+\uncover<4->{\alert<4>{ else \{}}
+\uncover<4->{\alert<4>{  croak "Error: matrix is not a 3D row matrix"}}
+\uncover<4->{\alert<4>{         unless ($rows==1);}}
+\uncover<5->{\alert<5>{  $r = 0;}}
+\uncover<4->{\alert<4>{ \}}}
+\uncover<6->{\alert<6>{ return Math::VectorReal->%
+             \alert<6>{\color{red}new(@\{$m->[0][$r]\})};}}
+\uncover<1->{\alert<1>{\}}}
+\end{semiverbatim}
+
+\visible<6>{Note the use of \alert{\color{red}\texttt{shift}}.}
+\end{frame}
+\end{document}