Sending out the bat signal . Could you please help me to get this piece of art? I have no idea about how to obtain it.
In the meantime I’m working on a MWE:
documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{matrix,fit,positioning}
\begin{document}
\begin{tikzpicture}
\matrix (A) [matrix of math nodes, nodes in empty cells,
nodes={draw, minimum width=8mm, minimum height=5mm, outer sep=0pt,
anchor=center},row sep=-\pgflinewidth, column sep=-\pgflinewidth,
row 3/.style = {nodes={minimum height=8mm}},
row 5/.style = {nodes={minimum height=8mm}},
column 3/.style = {nodes={minimum width=10mm}},
column 4/.style = {nodes={fill=lightgray}},
column 6/.style = {nodes={fill=lightgray}},
column 7/.style = {nodes={minimum width=10mm}},]
{ & & & R & & ? & & & \\
& & & |[draw,fill=blue!20]|R & & |[draw,fill=blue!20]|R & & & \\
& & & & & & & & \\
& & & |[draw,fill=blue!20]|R & & |[draw,fill=blue!20]|R & & & \\
& & & & & & & & \\
& & & ? & & R& & & \\
& & & |[draw,fill=blue!20]|R & &|[draw,fill=blue!20]| R& & & \\};
\foreach \i [count=\xi] in {1,2,\dots,$i$, ,$j$,\dots,$m-1$,$m$}
\node[above, font=\scriptsize] at (A-1-\xi.north) {\i\strut};
\foreach \i [count=\xi] in {1,2,\vdots,$u$,\vdots,$n-1$,$n$}
\node[left, font=\scriptsize] at (A-\xi-1.west) {\i\strut};
\node[right=1cm of A,align=left,text width=4cm,path picture={
\draw ([xshift=1em,yshift=-\pgflinewidth]path picture bounding box.north west) -|
([xshift=\pgflinewidth,yshift=\pgflinewidth]path picture bounding box.south west) -- ++ (1em,0);}] (txt){%
\dots};
\foreach \i in {2,4,7}
{\node[draw,rounded corners,fit=(A-\i-4)(A-\i-6),inner xsep=-1ex,
inner ysep=-0.3ex] (F-\i){};
\draw[-latex] (txt) -- (F-\i.east);
}
\end{tikzpicture}
\end{document}
UPDATE: this is the real combination of colors. I was opening the file from a mobile device and the actual colors were not loading the right way.
LAST UPDATE: When I turn on Night Mode in my laptop, the original picture look like this:
And ours(also in Night Mode) look like this:
There is something fishy going on, they have used a special kind of shadow. I hope we can find it out!
