%% 
%%  Example 07-04-4 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{158.31393pt}
\setlength\parindent{0pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\[
Y^1=
\begin{array}{c}
  \left[\begin{array}{rrrr}
    0 & 0 & 1 & 0\\
    1 & 0 & 1 & 0\\
    1 & 1 & 1 & 1
  \end{array}\right]\\[3ex]\hline
  \begin{array}{rrrr}
%    \hdotsfor{4}\\% instead of \\[3ex]\hline
    2 & 1 &3 & 1
  \end{array}
\end{array}
\]
\end{document}
