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a guest Feb 23rd, 2019 60 Never
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  1. documentclass[tikz,border=3.14mm]{standalone}
  2. usetikzlibrary{matrix}
  3. begin{document}
  4. begin{tikzpicture}
  5.  edeflstadd{{0,16,-12}}
  6.  edeflstsub{{-4,0,6}}
  7.  matrix[matrix of math nodes,nodes={text width=1.5em}] (mat)
  8.  {
  9.     0 & 2 & 1 & 0 & 2 \
  10.     3 & -1 & 2 & 3 & -1\
  11.     4 & -4 & 1 & 4 & -4\
  12.  };
  13.  foreach X [evaluate=X as Y using {int(X+2)}]in {1,2,3}
  14.  {pgfmathtruncatemacro{mylabel}{lstadd[X-1]}
  15.  draw[purple,-latex,thick] (mat-1-X.north west) -- (mat-3-Y.south east)
  16.  node[pos=1.1]{mylabel};
  17.  pgfmathtruncatemacro{mylabel}{lstsub[X-1]}
  18.  draw[purple,-latex,thick] (mat-3-X.south west) -- (mat-1-Y.north east)
  19.  node[pos=1.1]{mylabel};
  20.  }
  21. end{tikzpicture}
  22. end{document}
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