How is it possible to make such a construction in LaTeX?
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2Welcome to TeX.SE. Yes it is possible your construction. There is the same example at the link: tex.stackexchange.com/questions/331691/…. – Sebastiano Feb 18 '17 at 9:41
It's simple with blkarray
:
\documentclass[12pt]{report}
\usepackage{blkarray}
\usepackage{amsmath}
\renewcommand{\arraystretch}{1.4}
\begin{document}
\[
\begin{blockarray}{rrccc}
& von: & N & K & E \\
\begin{block}{rr(ccc)}
N & & 0 & 0 & 0,4 \\
nach: K & A= & 0,75 & 0 & 0 \\
E & & 0 & 0,8 & 0,8 \\
\end{block}
\end{blockarray}
\]
\end{document}