so not really sure on how I can achieve this, I have tried to do it so far with tikznode and didn't get it to look like I wanted, granted not really sure of what I'm doing. This is the output I'm trying to get :

desired output

This is the basic code I'm using, without any annotation added to it :

\documentclass{article}
\usepackage{amsmath,mathrsfs}
\usepackage[usenames, dvipsnames,svgnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{intersections, decorations.pathreplacing,shapes,shapes.geometric,hobby,patterns,babel,matrix,calc}
\DeclareMathOperator{\Mat}{Mat}
\begin{document}
$L_{ij}(k) \rightarrow E_{ij}(k) =  \begin{pmatrix}
1 & & & \\
& 1 & & \\
k & & \ddots & \\
& & & 1
\end{pmatrix}$
\end{document}
up vote 12 down vote accepted

The new version of tikzmark is soon part of the standard TeX distribution. It contains a command \tikzmarknode, which can be used as follows:

\documentclass{article}
\usepackage{amsmath,mathrsfs}
\usepackage[usenames, dvipsnames,svgnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{tikzmark,calc}
\DeclareMathOperator{\Mat}{Mat}
\begin{document}
$L_{ij}(k) \rightarrow E_{ij}(k) =  \begin{pmatrix}
\tikzmarknode{l1}{1} & & & \\
& \tikzmarknode{l2}{1} & & \\
\tikzmarknode{k}{k} & & \ddots & \\
& & & \tikzmarknode{l3}{1}
\end{pmatrix}$
\begin{tikzpicture}[overlay,remember picture]
\draw[<-] ($(l1.center)!0.5!(l2.center)$) to[out=45,in=180] 
($(l1)+(2.5cm,0)$) node[right,anchor=north west,align=left,yshift=\baselineskip]{some long text\\
and more text};
\draw[<-,shorten <=3pt] (k.west) --++ (-0.4,0) node[left] {text};
\draw[<-,shorten <=3pt] (k.south) --++ (0,-0.8) node[below] {more text};
\end{tikzpicture}
\end{document}

enter image description here

Note that you may have to update your TeX distribution to run this (in case you do not yet have the newest version of the tikzmark library).

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