how to replace matrix element by color box

Question

How can I replace the matrix element by colored squared box ? Suppose I have a 10x10 matrix with entries{+1,-1}. I want to put a black square box for +1 and red square box got -1 which will give me a design. Anyone can provide me clear idea ? Thanks in advance.

Welcome to TeX.SX! Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. — cfr, Jul 11 '14 at 02:03

score 11 · Answer 1 · edited Apr 13 '17 at 12:34

Below I present two possibilities.

You don't even need the 1s; it's enough to have an array of + and - characters:

\documentclass{article}
\usepackage{fancyvrb}
\usepackage{xcolor}

\makeatletter
\newenvironment{MyVerb}
  {
    \def\verbatim@nolig@list{\do\`\do\<\do\>\do\,\do\'}
    \catcode`+=\active
    \catcode`-=\active
    \setlength\fboxsep{6pt}
    \offinterlineskip
    \VerbatimEnvironment
    \begin{Verbatim}
  }
  {\end{Verbatim}}
\makeatother

\begin{document}

\begin{MyVerb}[defineactive=%
    \def+{\colorbox{black}{\phantom{a}}}
    \def-{\colorbox{red!70!black}{\phantom{a}}}]
+-+-+-+-+-
-+-+-+-+-+
+-+-+-+-+-
-+-+-+-+-+
+-+-+-+-+-
-+-+-+-+-+
+-+-+-+-+-
-+-+-+-+-+
+-+-+-+-+-
-+-+-+-+-+
\end{MyVerb}

\begin{MyVerb}[defineactive=%
    \def+{\colorbox{black}{\phantom{a}}}
    \def-{\colorbox{red!70!black}{\phantom{a}}}]
+---+---+-
--+---+---
-+++-+++-+
--+---+---
+---+---+-
++-+++-+++
+---+---+-
--+---+---
-+++-+++-+
--+---+---
\end{MyVerb}

\begin{MyVerb}[defineactive=%
    \def+{\colorbox{black}{\phantom{a}}}
    \def-{\colorbox{red!70!black}{\phantom{a}}}]
++++++++++
+---++---+
+-+-++-+-+
+++-++-+++
----++----
----++----
+++-++-+++
+-+-++-+-+
+---++---+
++++++++++
\end{MyVerb}

\end{document}

enter image description here

This answer is a variation of my answer to Is there a way to make a certain character in a Verbatim have a certain formatting?.

Here's a different approach using this time the collcell package: \documentclass{article} \usepackage[table]{xcolor} \usepackage{collcell}

\def\Side{8pt}

\newcommand\ColCell[1]{%
  \ifnum#1=-1\relax
    \gdef\mycolor{red!70!black}
  \else
  \ifnum#1=1\relax
    \gdef\mycolor{black}
  \fi\fi 
  \expandafter\expandafter\cellcolor{\mycolor}%
    \parbox[c][\dimexpr\Side+2\tabcolsep\relax][c]{\Side}{}%
}

\newcolumntype{E}{>{\centering\arraybackslash\collectcell\ColCell}p{\Side}<{\endcollectcell}}

\begin{document}

\noindent\begin{tabular}{*{10}{E}}
+1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 \\
-1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 \\
+1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 \\
-1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 \\
+1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 \\
-1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 \\
+1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 \\
-1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 \\
+1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 \\
-1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 & -1 & +1 \\
\end{tabular}\qquad        
\noindent\begin{tabular}{*{10}{E}}
+1 & -1 & -1 & -1 & +1 & -1 & -1 & -1 & +1 & -1 \\
-1 & -1 & +1 & -1 & -1 & -1 & +1 & -1 & -1 & -1 \\
-1 & +1 & +1 & +1 & -1 & +1 & +1 & +1 & -1 & +1 \\
-1 & -1 & +1 & -1 & -1 & -1 & +1 & -1 & -1 & -1 \\
+1 & -1 & -1 & -1 & +1 & -1 & -1 & -1 & +1 & -1 \\
+1 & +1 & -1 & +1 & +1 & +1 & -1 & +1 & +1 & +1 \\
+1 & -1 & -1 & -1 & +1 & -1 & -1 & -1 & +1 & -1 \\
-1 & -1 & +1 & -1 & -1 & -1 & +1 & -1 & -1 & -1 \\
-1 & +1 & +1 & +1 & -1 & +1 & +1 & +1 & -1 & +1 \\
-1 & -1 & +1 & -1 & -1 & -1 & +1 & -1 & -1 & -1 \\
\end{tabular}\bigskip

\noindent\begin{tabular}{*{10}{E}}
+1 & +1 & +1 & +1 & +1 & +1 & +1 & +1 & +1 & +1 \\
+1 & -1 & -1 & -1 & +1 & +1 & -1 & -1 & -1 & +1 \\
+1 & -1 & +1 & -1 & +1 & +1 & -1 & +1 & -1 & +1 \\
+1 & +1 & +1 & -1 & +1 & +1 & -1 & +1 & +1 & +1 \\
-1 & -1 & -1 & -1 & +1 & +1 & -1 & -1 & -1 & -1 \\
-1 & -1 & -1 & -1 & +1 & +1 & -1 & -1 & -1 & -1 \\
+1 & +1 & +1 & -1 & +1 & +1 & -1 & +1 & +1 & +1 \\
+1 & -1 & +1 & -1 & +1 & +1 & -1 & +1 & -1 & +1 \\
+1 & -1 & -1 & -1 & +1 & +1 & -1 & -1 & -1 & +1 \\
+1 & +1 & +1 & +1 & +1 & +1 & +1 & +1 & +1 & +1 \\
\end{tabular}

\end{document}

enter image description here

@Erfan You're welcome. Don't forget that, after a sensible wait, you can accept an answer that you consider solved your problem by clicking the checkmark to its left. In case of doubt, please see How do you accept an answer?. — Gonzalo Medina, Jul 11 '14 at 17:46

how to replace matrix element by color box

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