I guess there are other possibilities to achieve this without tikz
. But with the following, you will get what you want. Note that the arrow above overlaps the stuff that is typeset above the matrix, so maybe you add a vspace
there. Alike, the arrow on the right overlaps stuff there.
\documentclass{article}
\usepackage{amsmath,tikz}
\usetikzlibrary{tikzmark}
\begin{document}
$\bordermatrix{%
\tikzmark{tl} & A & B & C & D & E \tikzmark{tr}\cr
\tikzmark{bt} CV_{1} & 0.16 & 0.31 & 0.76 & 0.82 & 0.042 \cr
CV_{2} & 0.35 & 0.54 & 0.21 & 0.12 & 0.48 \cr
CV_{3} & 0.07 & 0.44 & 0.23 & 0.71 & 0.906 \cr
\tikzmark{bb} CV_{4} & 0.37 & 0.31 & 0.91 & 0.75 & 0.22 \cr
}$
\begin{tikzpicture}[remember picture,overlay,
every path/.style={->},
every node/.style={draw,circle,inner sep=2pt,fill=white}]
\draw ([xshift=23pt,yshift=18pt]pic cs:tl) -- node {1} ([xshift=12pt,yshift=18pt]pic cs:tr);
\draw ([xshift=-12pt,yshift=8pt]pic cs:bt) -- node {2} ([xshift=-12pt]pic cs:bb);
\end{tikzpicture}
\end{document}