%% 
%%  Example 07-04-6 
%%  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}
\[
\overrightarrow{A}=\left[
    \begin{array}{cccc}
	1 & 2 & 3 & 4\\
	1 & 2 & 3 & 4\\\hline
	\multicolumn{1}{|c}{1} & 2 & 3 &
	\multicolumn{1}{c|}{4}\\\hline
	1 & 2 & 3 & 4
    \end{array}\right]
\]
\end{document}
