Horizontal stretching of pmatrix

Question

I have the following code to generate a pmatrix:

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{graphicx}

\renewcommand\arraystretch{2}

\begin{document}

\
$$
\begin{pmatrix}
  2 & 1 & 0 & 0 & 1 & 0 \\
  1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0  \\
  0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 \\
  0 & 0 & 0 & 1 & 0 & 0
 \end{pmatrix}
$$

\end{document}

It currently looks like this:

Now I want to stretch the matrix both horizontally and vertically in such a way such that it covers most of the page area. How can I do this?

Answer 1

You can play with \arraycolsep, and to ensure a proper spacing between the contents of the matrix and the parentheses, you can nest a matrix environment, surrounded by a pair of horizontal spaces, in a pmatrix environment, like this:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}

\begin{document}

\[ \setlength{\arraycolsep}{10pt}
\renewcommand\arraystretch{2}
  \begin{pmatrix}
    \hspace {0.7em}
  \begin{matrix}
  2 & 1 & 0 & 0 & 1 & 0 \\
  1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0 \\
  0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 \\
  0 & 0 & 0 & 1 &0 & 0
  \end{matrix}
    \hspace {0.7em}
  \end{pmatrix}
\]

\end{document} 

Answer 2

Use \arraycolsep:

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{graphicx}


\begin{document}

\setlength{\arraycolsep}{10pt}.
\renewcommand\arraystretch{2}

\[
\begin{pmatrix}
  2 & 1 & 0 & 0 & 1 & 0 \\
  1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0 \\
  0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 \\
  0 & 0 & 0 & 1 & 0 & 0
\end{pmatrix}
\]

\end{document}

And also please un-learn $$, it's deprecated.

Answer 3

One possibility is to use tabular*. Please see here for more options.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\renewcommand\arraystretch{2}

\begin{document}

\[
 \left(\vcenter{\hbox{\begin{tabular*}{0.85\textwidth}{@{\extracolsep{\fill}} *{6}{c}}
  2 & 1 & 0 & 0 & 1 & 0 \\
  1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0  \\
  0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 \\
  0 & 0 & 0 & 1 & 0 & 0
 \end{tabular*}}}\right)
\]

\end{document}

Answer 4

The following code requires the number of columns; it automatically fills the \displaywidth.

\documentclass{article}
\usepackage{amsmath}
\usepackage{expl3}

\ExplSyntaxOn
\cs_set_eq:NN \replicate \prg_replicate:nn
\ExplSyntaxOff

\makeatletter
\newenvironment{bigpmatrix}[1]
 {\left(\,
  \settowidth\dimen@{$\Bigg(\,\,$}%
  \vcenter to \displaywidth\bgroup
    \def\\{\cr\noalign{\vfil}}%
    \edef\preamble{\replicate{#1-2}{$####$\unskip&}}%
    \tabskip=0pt
    \medskip
    \halign to \dimexpr \displaywidth-2\dimen@\bgroup
      $##$\unskip\tabskip=0pt plus 1fil &
      \span\preamble
      $##$\unskip\tabskip0pt\cr
 }{\crcr\egroup\medskip\egroup\,\right)}
\makeatother

\begin{document}

\[
\begin{bigpmatrix}{12}
  2 & 1 & 0 & 0 & 1 & 0 & 1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 \\
  2 & 1 & 0 & 0 & 1 & 0 & 1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 \\
  2 & 1 & 0 & 0 & 1 & 0 & 1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 \\
  2 & 1 & 0 & 0 & 1 & 0 & 1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0
 \end{bigpmatrix}
\]

\end{document}

Answer 5

A TABstack allows both dimensions (column gap and row baselineskip) to be specified.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tabstackengine}
\stackMath
\begin{document}
\[
\setstackgap{L}{60pt}
\setstacktabbedgap{60pt}
\parenMatrixstack{
  2 & 1 & 0 & 0 & 1 & 0 \\
  1 & 0 & 1 & 0 & 1 & 0 \\
  0 & 1 & 0 & 1 & 0 & 0  \\
  0 & 0 & 1 & 0 & 1 & 1 \\
  1 & 1 & 0 & 1 & 0 & 0 \\
  0 & 0 & 0 & 1 & 0 & 0
 }
\]
\end{document}

Answer 6

I believe you can use the TikZ package in the preamble and use amsmath as well. With this, use the scaling feature:

\usepackage{tikz} % in the preamble
\usepackage{amsmath} % in the preamble
\usetikzlibrary{matrix} % in the preamble
\begin{tikzpicture}[scale=.5]

However, I am not sure whether you need to set transform shape.