How to change brackets for this modified matrix?

Question

I found this code here (stackexchange) and modified it for the matrix I needed to make. But I want to have thoses brackets[ ]. I tried to change blockarray for \left[ and \right]. Can anybody help me please? I needed \usepackage{blkarray} for this.

 \[ \newcounter{rowct}\newcounter{colct}%\setlength\extrarowheight{1cm}
    \begin{blockarray}{*{8}{c}}
    \begin{block}{r*{7}{>{\refstepcounter{colct}\mathclap{\mathbf\thecolct}}c}}
     & & & & & & & \\%[-1ex]
     \end{block}
     \begin{block}{ >{\refstepcounter{rowct}\mathbf\therowct}r( >{\hspace{0.2em}}*{7}{c} <{\hspace{0.2em}})}
      & 0 & 1 & 1 & 1 & 1 & 0 & 0 \rule{0pt}{3.5ex} \\
      & 1 & 0 & 1 & 1 & 0 & 1 & 0 \\
      & 1 & 1 & 0 & 0 & 0 & 0 & 0 \\
      & 1 & 1 & 0 & 0 & 1 & 1 & 1 \\
      & 1 & 0 & 0 & 1 & 0 & 0 & 1\\
      & 0 & 1 & 0 & 1 & 0 & 0 & 0 \\
      & 0 & 0 & 0 & 1 & 1 & 0 & 0\\[1ex]
     \end{block}
    \end{blockarray}
    \]

score 0 · Accepted Answer · answered Oct 08 '20 at 23:10

Just replace the pair ( ) in the second block with a pair of [ ]:

\documentclass{article}
\usepackage{mathtools}
\usepackage{blkarray}
\begin{document}
[ \newcounter{rowct}\newcounter{colct}%\setlength\extrarowheight{1cm}
\begin{blockarray}{{8}{c}}
\begin{block}{r{7}{>{\refstepcounter{colct}\mathclap{\mathbf\thecolct}}c}}
 & & & & & & & \%[-1ex]
 \end{block}
 \begin{block}{ >{\refstepcounter{rowct}\mathbf\therowct}r[ >{\hspace{0.2em}}*{7}{c} <{\hspace{0.2em}}]}
  & 0 & 1 & 1 & 1 & 1 & 0 & 0 \rule{0pt}{3.5ex} \
  & 1 & 0 & 1 & 1 & 0 & 1 & 0 \
  & 1 & 1 & 0 & 0 & 0 & 0 & 0 \
  & 1 & 1 & 0 & 0 & 1 & 1 & 1 \
  & 1 & 0 & 0 & 1 & 0 & 0 & 1\
  & 0 & 1 & 0 & 1 & 0 & 0 & 0 \
  & 0 & 0 & 0 & 1 & 1 & 0 & 0\[1ex]
 \end{block}
\end{blockarray}
]
\end{document}

Got it! This answers my question. Thank you! – Aezir Oct 08 '20 at 23:15 — Aezir, Oct 08 '20 at 23:15

score 0 · Answer 2 · answered Oct 09 '20 at 09:37

You can do that easily with nicematrix.

\documentclass{article}
\usepackage{nicematrix}
\begin{document}
$\begin{bNiceMatrix}%
  [ 
   first-row,
   code-for-first-row = \mathbf{\arabic{jCol}},
   first-col,
   code-for-first-col = \mathbf{\arabic{iRow}},
  ]
&   &   &   &   &   &   &   \
& 0 & 1 & 1 & 1 & 1 & 0 & 0 \
& 1 & 0 & 1 & 1 & 0 & 1 & 0 \
& 1 & 1 & 0 & 0 & 0 & 0 & 0 \
& 1 & 1 & 0 & 0 & 1 & 1 & 1 \
& 1 & 0 & 0 & 1 & 0 & 0 & 1 \
& 0 & 1 & 0 & 1 & 0 & 0 & 0 \
& 0 & 0 & 0 & 1 & 1 & 0 & 0 \
\end{bNiceMatrix}$
\end{document}

How to change brackets for this modified matrix?

2 Answers2