Argthtjtr

I am drawing a matrix using tikz-cd. I would like to draw some vertical and horizontal lines on it too to indicate particular submatrices but I don't understand the syntax. This is my M(N)WE:

documentclass{article}

usepackage[margin=1cm]{geometry}

usepackage{tikz-cd}

begin{document}

begin{tikzcd}[column sep=3pt, row sep=5pt,nodes={inner sep=0pt,align=center,

text width={width("20")}}]

&&0&0&0&0&0&0&0&0&0&0\

&0&1&2&3&4&5&6&7&8&9&10\

0&1&0&1&2&3&4&5&6&7&8&9\

0&2&1&0&1&2&3&4&5&6&7&8\

0&3&2&1&0&1&2&3&4&5&6&7\

0&4&3&2&1&0&1&2&3&4&5&6

foreach x in {1,3}

{

    draw 

    ([yshift=-3,xshift=-.125pgflinewidth]mat-x-1.south west) --   

    ([yshift=-3,xshift=-.125pgflinewidth]mat-x-12.south east);

}

foreach y in {2}

{

    draw 

    ([yshift=.5pgflinewidth]mat-1-y.north east) -- 

    ([yshift=.5pgflinewidth]mat-14-y.south east);

}

end{tikzcd}



end{document}

This is syntactically incorrect but works if you remove the foreach loops. How can I use the foreach...draw commands with a tikz-cd drawn matrix?

Are you looking for this?

documentclass{article}

usepackage[margin=1cm]{geometry}

usepackage{tikz-cd}

begin{document}

begin{tikzcd}[column sep=3pt, row sep=5pt,nodes={inner sep=0pt,align=center,

text width={width("20")}},nodes in empty cells,

execute at end picture={

foreach x in {1,3}

{

    draw 

    ([yshift=-3,xshift=-.125pgflinewidth]tikzcdmatrixname-x-1.south west) --   

    ([yshift=-3,xshift=-.125pgflinewidth]tikzcdmatrixname-x-12.south east);

}

foreach y in {3}

{

    draw 

    ([yshift=.5pgflinewidth]tikzcdmatrixname-1-y.north west) -- 

    ([yshift=.5pgflinewidth]tikzcdmatrixname-6-y.south west);

}}]

&&0&0&0&0&0&0&0&0&0&0\

&0&1&2&3&4&5&6&7&8&9&10\

0&1&0&1&2&3&4&5&6&7&8&9\

0&2&1&0&1&2&3&4&5&6&7&8\

0&3&2&1&0&1&2&3&4&5&6&7\

0&4&3&2&1&0&1&2&3&4&5&6

end{tikzcd}

end{document}

Here I was employing Henri Menke's nice answer and added nodes in empty cells and changed some numbers to only use existing nodes.

ADDENDUM: If you want to the lines right in the middle between the cells without having to add all the shifts by fractions of the line width, you could use the calc library.

documentclass{article}

usepackage[margin=1cm]{geometry}

usepackage{tikz-cd}

usetikzlibrary{calc}

begin{document}

begin{tikzcd}[column sep=3pt, row sep=5pt,nodes={inner sep=0pt,align=center,

text width={width("20")}},nodes in empty cells,

execute at end picture={

foreach x [evaluate=x as xp using {int(x+1)}] in {1,3}

{

    draw ($(tikzcdmatrixname-x-2.south)!0.5!(tikzcdmatrixname-xp-2.north)$)

    coordinate (aux)

    ([xshift=-.1em]tikzcdmatrixname.west|-aux) --   

    ([xshift=.1em]tikzcdmatrixname.east|-aux);

}

foreach y [evaluate=y as ym using {int(y-1)}] in {3}

{

    draw ($(tikzcdmatrixname-1-y.west)!0.5!(tikzcdmatrixname-1-ym.east)$)

    coordinate (aux)

    ([yshift=0.1ex]tikzcdmatrixname.north-|aux) -- 

    ([yshift=0.1ex]tikzcdmatrixname.south-|aux);

}}]

&&0&0&0&0&0&0&0&0&0&0\

&0&1&2&3&4&5&6&7&8&9&10\

0&1&0&1&2&3&4&5&6&7&8&9\

0&2&1&0&1&2&3&4&5&6&7&8\

0&3&2&1&0&1&2&3&4&5&6&7\

0&4&3&2&1&0&1&2&3&4&5&6

end{tikzcd}

end{document}

As for the question what this might be good for: there are certain things that are somewhat harder to achieve with a table like e.g.

documentclass{article}

usepackage[margin=1cm]{geometry}

usepackage{tikz-cd}

usetikzlibrary{calc,through,backgrounds} 

tikzset{circle through 3 points/.style n args={3}{% 

insert path={let p1=($(#1)!0.5!(#2)$), 

p2=($(#1)!0.5!(#3)$), 

p3=($(#1)!0.5!(#2)!1!-90:(#2)$), 

p4=($(#1)!0.5!(#3)!1!90:(#3)$), 

p5=(intersection of p1--p3 and p2--p4) 

in }, 

at={(p5)}, 

circle through= {(#1)} 

}} 

begin{document}

begin{tikzcd}[column sep=3pt, row sep=5pt,nodes={inner sep=0pt,align=center,

text width={width("20")}},nodes in empty cells,

execute at end picture={

foreach x [evaluate=x as xp using {int(x+1)}] in {1,3}

{

    draw ($(tikzcdmatrixname-x-2.south)!0.5!(tikzcdmatrixname-xp-2.north)$)

    coordinate (aux)

    ([xshift=-.1em]tikzcdmatrixname.west|-aux) --   

    ([xshift=.1em]tikzcdmatrixname.east|-aux);

}

foreach y [evaluate=y as ym using {int(y-1)}] in {3}

{

    draw ($(tikzcdmatrixname-1-y.west)!0.5!(tikzcdmatrixname-1-ym.east)$)

    coordinate (aux)

    ([yshift=0.1ex]tikzcdmatrixname.north-|aux) -- 

    ([yshift=0.1ex]tikzcdmatrixname.south-|aux);

}

begin{scope}[on background layer]

 node[circle through 3

 points={tikzcdmatrixname-2-2}{tikzcdmatrixname-3-1}{tikzcdmatrixname-3-3},

 fill=blue!20]{}; 

end{scope}

}]

&&0&0&0&0&0&0&0&0&0&0\

&0&1&2&3&4&5&6&7&8&9&10\

0&1&0&1&2&3&4&5&6&7&8&9\

0&2&1&0&1&2&3&4&5&6&7&8\

0&3&2&1&0&1&2&3&4&5&6&7\

0&4&3&2&1&0&1&2&3&4&5&6

end{tikzcd}

end{document}

Yet for many purposes, the table approach suggested by Joule V is just fine or even better. It really depends on what you want to do in the end.

Just for fun: if you want to make that matrix, why don't use a table? The code is much shorter:

documentclass{article}

begin{document}

renewcommand{arraystretch}{1.3}

begin{tabular}{cc|cccccccccc}

    &&0&0&0&0&0&0&0&0&0&0\hline

    &0&1&2&3&4&5&6&7&8&9&10\

    0&1&0&1&2&3&4&5&6&7&8&9\hline

    0&2&1&0&1&2&3&4&5&6&7&8\

    0&3&2&1&0&1&2&3&4&5&6&7\

    0&4&3&2&1&0&1&2&3&4&5&6

end{tabular}

end{document}

Coloring the text is not difficult, isn't it? If you want to draw some arrows, tikzmark may be an option. Anyway, if I were you, I would use a simple table. :)

Add an arrow

documentclass{article}

usepackage{tikz}

begin{document}

renewcommand{arraystretch}{1.3}

begin{tabular}{cc|cccccccccc}

    &&0&0&0&0&0&0&0&0&0&0\hline

    &0&1&2&3&4&5&6&7&8&9&10\

    0&tikz[baseline,remember picture]node[anchor=base,inner sep=0pt] (node1) {1};&0&1&2&3&4&5&6&7&8&9\hline

    0&2&1&0&1&2&3&4&5&6&7&8\

    0&3&2&1&0&1&2&tikz[baseline,remember picture]node[anchor=base,inner sep=0pt] (node2) {3};&4&5&6&7\

    0&4&3&2&1&0&1&2&3&4&5&6

end{tabular}



begin{tikzpicture}[remember picture,overlay]

draw[red,very thick,-latex] (node1) -- (node2);

end{tikzpicture}

end{document}

Color row(s)

documentclass{article}

usepackage{tikz}

usepackage{xcolor,colortbl}

begin{document}

renewcommand{arraystretch}{1.3}

begin{tabular}{cc|cccccccccc}

    rowcolor{red!20}&&0&0&0&0&0&0&0&0&0&0\hline

    rowcolor{red!20}&0&1&2&3&4&5&6&7&8&9&10\

    0&1&0&1&2&3&4&5&6&7&8&9\hline

    0&2&1&0&1&2&3&4&5&6&7&8\

    0&3&2&1&0&1&2&3&4&5&6&7\

    0&4&3&2&1&0&1&2&3&4&5&6

end{tabular}

end{document}

Color column(s)

documentclass{article}

usepackage{tikz}

usepackage{xcolor,colortbl}

begin{document}

renewcommand{arraystretch}{1.3}

begin{tabular}{cc|ccc>{columncolor{yellow!50}}cc>{columncolor{green!20}}ccccc}

    &&0&0&0&0&0&0&0&0&0&0\hline

    &0&1&2&3&4&5&6&7&8&9&10\

    0&1&0&1&2&3&4&5&6&7&8&9\hline

    0&2&1&0&1&2&3&4&5&6&7&8\

    0&3&2&1&0&1&2&3&4&5&6&7\

    0&4&3&2&1&0&1&2&3&4&5&6

end{tabular}

end{document}

It is never impossible to work with tables using table commands :)