Math & Science ⇒ Latex matrix

[Mithrandir]

https://ibb.co/yycLztn
I need help implementing these matrices.
How can I implement these arrows in the picture into a project about latex

[Stefan Kottwitz]

Hi Mithrandir,

welcome to the forum!

What is the actual issue you see? We don't type matrices and long texts but we can help with issues. If you would like to post such matrix code, we can help to add such arrows.

Stefan

[Stefan Kottwitz]

Here is how I did it for the TikZ gallery years ago:

Code: Select all

% Highlighting elements in matrices
% Author: Stefan Kottwitz
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{fit}
\tikzset{%
  highlight/.style={rectangle,rounded corners,fill=red!15,draw,fill opacity=0.5,thick,inner sep=0pt}
}
\newcommand{\tikzmark}[2]{\tikz[overlay,remember picture,baseline=(#1.base)] \node (#1) {#2};}
%
\newcommand{\Highlight}[1][submatrix]{%
    \tikz[overlay,remember picture]{
    \node[highlight,fit=(left.north west) (right.south east)] (#1) {};}
}
\begin{document}
\[
  M = \left(\begin{array}{*5{c}}
    \tikzmark{left}{1} & 2 & 3 & 4 & 5\\
    6 & 7 & 8 & 9 & 10 \\
    11 & 12 & \tikzmark{right}{13} & 14 & 15 \\
    16 & 17 & 18 & 19 & 20
  \end{array}\right)
  \Highlight[first]
  \qquad
  M^T = \left(\begin{array}{*5{c}}
    \tikzmark{left}{1} & 6 & 11 & 16 \\
    2 & 7 & 12 & 17 \\
    3 & 8 & \tikzmark{right}{13} & 18 \\
    4 & 9 & 14 & 19 \\
    5 & 10 & 15 & 20
  \end{array}\right)
\]
\Highlight[second]

\tikz[overlay,remember picture] {
  \draw[->,thick,red,dashed] (first) -- (second) node [pos=0.66,above] {Transpose};
  \node[above of=first] {$N$};
  \node[above of=second] {$N^T$};
}
\end{document}​

highlighting-matrix.png (12.82 KiB) Viewed 3305 times

Stefan