Ggtkuk

Using the following code

documentclass{beamer}

beamertemplatenavigationsymbolsempty

usepackage{verbatim}

usepackage{tikz}

usepackage{pgfplots}

usetikzlibrary{arrows, arrows.meta}

usetikzlibrary{matrix}

begin{document}

begin{frame}[t,fragile]

frametitle{}

begin{tikzpicture}

matrix (x) [matrix of nodes,row sep=1em,column sep=1em] {%

15.1 & 23.7 & 19.7 & 15.4 & 18.3 & 23.0\

17.4 & 18.6 & 12.9 & 20.3 & 13.7 & 21.4\

10.3 & 26.1 & 15.7 & 14.0 & 17.8 & 33.8\

23.2 & 12.9 & 29.8 & 18.3 & 14.2 & 20.8\

13.5 & 17.1 & 20.7 & 27.1 & 18.9 & 16.6\};

draw<2->[ultra thick, blue, latex'-] (x-2-1) -- (x-4-5);

% Node names: (<name of matrix>-<row>-<column>)

end{tikzpicture}

end{frame}

end{document}

from the answer to this question

Can the matrix elements be separated by lines so that it could look like a table with borders between cells

matrix itself is not really designed to draw tables, but with calc one can always draw any kind of line.

documentclass{beamer}

beamertemplatenavigationsymbolsempty

usepackage{verbatim}

usepackage{tikz}

usetikzlibrary{arrows, arrows.meta}

usetikzlibrary{matrix,calc}

begin{document}

begin{frame}[t,fragile]

frametitle{}

begin{tikzpicture}

matrix (x) [matrix of nodes,row sep=1em,column sep=1em] {%

15.1 & 23.7 & 19.7 & 15.4 & 18.3 & 23.0\

17.4 & 18.6 & 12.9 & 20.3 & 13.7 & 21.4\

10.3 & 26.1 & 15.7 & 14.0 & 17.8 & 33.8\

23.2 & 12.9 & 29.8 & 18.3 & 14.2 & 20.8\

13.5 & 17.1 & 20.7 & 27.1 & 18.9 & 16.6\};

draw<2->[ultra thick, blue, latex'-] (x-2-1) -- (x-4-5);

% Node names: (<name of matrix>-<row>-<column>)

foreach i in {1,...,6} 

    draw ($(x-1-i.north west)+(-.5em,.5em)$) -- ($(x-5-i.south west)+(-.5em,-.5em)$);

foreach i in {1,...,5} 

    draw ($(x-i-1.south west)+(-.5em,-.5em)$) -- ($(x-i-6.south east)+(.5em,-.5em)$);

draw ($(x-1-1.north west)+(-.5em,.5em)$) -| ($(x-5-6.south east)+(.5em,-.5em)$);

end{tikzpicture}

end{frame}

end{document}

Just for fun with some styles.

documentclass{beamer}

beamertemplatenavigationsymbolsempty

usepackage{verbatim}

usepackage{tikz}

usetikzlibrary{arrows,calc}

usetikzlibrary{matrix}

begin{document}

begin{frame}[t,fragile]

frametitle{}

begin{tikzpicture}[vline/.style={insert path={

($(x-1-#1.east)!0.5!(x-1-thenumexpr1+#1.west)$) coordinate (aux) 

(x.north-|aux) -- (x.south-|aux)}},

hline/.style={insert path={

($(x-#1-1.south)!0.5!(x-thenumexpr1+#1relax-1.north)$) coordinate (aux) 

(x.west|-aux) -- (x.east|-aux)}}]

matrix (x) [matrix of nodes,row sep=1em,column sep=1em] {%

15.1 & 23.7 & 19.7 & 15.4 & 18.3 & 23.0\

17.4 & 18.6 & 12.9 & 20.3 & 13.7 & 21.4\

10.3 & 26.1 & 15.7 & 14.0 & 17.8 & 33.8\

23.2 & 12.9 & 29.8 & 18.3 & 14.2 & 20.8\

13.5 & 17.1 & 20.7 & 27.1 & 18.9 & 16.6\};

draw[vline/.list={1,...,5},hline/.list={1,...,4}] (x.north west) rectangle 

(x.south east);

draw<2->[ultra thick, blue, latex'-] (x-2-1) -- (x-4-5);

% Node names: (<name of matrix>-<row>-<column>)

end{tikzpicture}

end{frame}

end{document}