# [Tex/LaTex] Drawing a large binary matrix as colored grid in TikZ

matricestikz-pgf

I have a pretty big binary matrix of maybe 70 rows and 64 columns. For ease of viewing, I would like to draw this matrix in TikZ where e.g. a 1 is represtented by a red square and a 0 is a white square.
Does anyone have any idea how I could obtain this?

Ideally, I would have something where I can just load the matrix from a file and TikZ would handle everything else. Otherwise, I am also happy with a solution having to do find/replace every 0 by some string, and replace every 1 by another string.

Example matrix:

10110101010
10010101010
01010111010
11110010100
01100011001
11101010111
10101010111


The answer provides two solutions: by means of the first one it is possible to customize the dimension of the squares and perhaps suits better your needs. Both are based on answers given here.

Solution n.1 is based on Create square and custom size cells in a table using pgfplotstable:

\documentclass{article}
\usepackage{filecontents}
\usepackage[table]{xcolor}
\usepackage{pgfplotstable}
\usetikzlibrary{calc}
\pgfplotsset{compat=1.8}

\begin{filecontents}{matrix.cvs}
1 0 1 1 0 1 0 1 0 1 0
1 0 0 1 0 1 0 1 0 1 0
0 1 0 1 0 1 1 1 0 1 0
1 1 1 1 0 0 1 0 1 0 0
0 1 1 0 0 0 1 1 0 0 1
1 1 1 0 1 0 1 0 1 1 1
1 0 1 0 1 0 1 0 1 1 1
\end{filecontents}

\makeatletter
\tikzset{
zero color/.initial=white,
zero color/.get=\zerocol,
zero color/.store in=\zerocol,
one color/.initial=red,
one color/.get=\onecol,
one color/.store in=\onecol,
cell wd/.initial=1ex,
cell wd/.get=\cellwd,
cell wd/.store in=\cellwd,
cell ht/.initial=1ex,
cell ht/.get=\cellht,
cell ht/.store in=\cellht,
}

\newcommand{\drawgrid}[2][]{
\medskip
\begin{tikzpicture}[#1]
\pgfplotstableforeachcolumn#2\as\col{
\pgfplotstableforeachcolumnelement{\col}\of#2\as\colcnt{%
\ifnum\colcnt=0
\fill[\zerocol]($-\pgfplotstablerow*(0,\cellht) + \col*(\cellwd,0)$) rectangle+(\cellwd,\cellht);
\fi
\ifnum\colcnt=1
\fill[\onecol]($-\pgfplotstablerow*(0,\cellht) + \col*(\cellwd,0)$) rectangle+(\cellwd,\cellht);
\fi
}
}
\end{tikzpicture}
\medskip
}
\makeatother

\begin{document}

\drawgrid{\matrixfile}

\drawgrid[zero color=green, one color=cyan]{\matrixfile}

\drawgrid[zero color=orange,
one color=violet,
cell ht=2em,
cell wd=2em]{\matrixfile}
\end{document}


The result:

Solution n.2 is based on Parametrize shading in table through TikZ:

\documentclass{article}
\usepackage{filecontents}
\usepackage[table]{xcolor}
\usepackage{pgfplotstable}
\pgfplotsset{compat=1.8}

\begin{filecontents}{matrix.cvs}
1 0 1 1 0 1 0 1 0 1 0
1 0 0 1 0 1 0 1 0 1 0
0 1 0 1 0 1 1 1 0 1 0
1 1 1 1 0 0 1 0 1 0 0
0 1 1 0 0 0 1 1 0 0 1
1 1 1 0 1 0 1 0 1 1 1
1 0 1 0 1 0 1 0 1 1 1
\end{filecontents}

\makeatletter
\pgfplotstableset{
zero color/.initial=white,
zero color/.get=\zerocol,
zero color/.store in=\zerocol,
one color/.initial=red,
one color/.get=\onecol,
one color/.store in=\onecol,
color cells/.style={
string type,
postproc cell content/.code={%
\pgfkeysalso{@cell content=\rule{0cm}{2.4ex}\cellcolor{\zerocol}
\pgfmathtruncatemacro\number{##1}
\ifnum\number>0\cellcolor{\onecol}\fi}%
},
columns/x/.style={
column name={},
postproc cell content/.code={}
}
}
}
\makeatother

\begin{document}

\begin{table}
\centering
\pgfplotstabletypeset[color cells]\matrixfile
\end{table}

\begin{table}
\centering
\pgfplotstabletypeset[color cells, zero color=green, one color=cyan]\matrixfile
\end{table}
\end{document}


The result: